US20070038364A1 - Apparatus and method for switching navigation mode between vehicle navigation mode and personal navigation mode in navigation device - Google Patents
Apparatus and method for switching navigation mode between vehicle navigation mode and personal navigation mode in navigation device Download PDFInfo
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- US20070038364A1 US20070038364A1 US11/404,600 US40460006A US2007038364A1 US 20070038364 A1 US20070038364 A1 US 20070038364A1 US 40460006 A US40460006 A US 40460006A US 2007038364 A1 US2007038364 A1 US 2007038364A1
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- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/09—Arrangements for giving variable traffic instructions
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C21/00—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00
- G01C21/26—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00 specially adapted for navigation in a road network
- G01C21/34—Route searching; Route guidance
- G01C21/36—Input/output arrangements for on-board computers
- G01C21/3626—Details of the output of route guidance instructions
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C21/00—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00
- G01C21/10—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00 by using measurements of speed or acceleration
- G01C21/12—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00 by using measurements of speed or acceleration executed aboard the object being navigated; Dead reckoning
- G01C21/16—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00 by using measurements of speed or acceleration executed aboard the object being navigated; Dead reckoning by integrating acceleration or speed, i.e. inertial navigation
- G01C21/165—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00 by using measurements of speed or acceleration executed aboard the object being navigated; Dead reckoning by integrating acceleration or speed, i.e. inertial navigation combined with non-inertial navigation instruments
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C21/00—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00
- G01C21/20—Instruments for performing navigational calculations
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C21/00—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00
- G01C21/26—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00 specially adapted for navigation in a road network
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C21/00—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00
- G01C21/26—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00 specially adapted for navigation in a road network
- G01C21/34—Route searching; Route guidance
- G01C21/3407—Route searching; Route guidance specially adapted for specific applications
- G01C21/3423—Multimodal routing, i.e. combining two or more modes of transportation, where the modes can be any of, e.g. driving, walking, cycling, public transport
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/38—Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system
- G01S19/39—Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system the satellite radio beacon positioning system transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/42—Determining position
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/38—Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system
- G01S19/39—Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system the satellite radio beacon positioning system transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/52—Determining velocity
-
- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/09—Arrangements for giving variable traffic instructions
- G08G1/0962—Arrangements for giving variable traffic instructions having an indicator mounted inside the vehicle, e.g. giving voice messages
- G08G1/0968—Systems involving transmission of navigation instructions to the vehicle
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C21/00—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00
- G01C21/26—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00 specially adapted for navigation in a road network
- G01C21/34—Route searching; Route guidance
- G01C21/36—Input/output arrangements for on-board computers
- G01C21/3688—Systems comprising multiple parts or multiple output devices (not client-server), e.g. detachable faceplates, key fobs or multiple output screens
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P15/00—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration
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- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- Computer Networks & Wireless Communication (AREA)
- Navigation (AREA)
- Position Fixing By Use Of Radio Waves (AREA)
Abstract
Provided is an apparatus and method for switching a navigation mode between a vehicle navigation mode and a personal navigation mode in a navigation device supporting vehicle navigation and personal navigation. Switching between the vehicle navigation mode and the personal navigation mode is performed according to whether the navigation device is mounted in a navigation device holder, whether a GPS speed provided by a GPS receiver is higher than a predetermined speed, and whether a step is detected using an output of an accelerometer. Since mode switching between the vehicle navigation mode and the personal navigation mode is automatically performed, a user does not need to manually perform mode switching.
Description
- This application claims priority under 35 U.S.C. §119 to an application entitled “Apparatus and Method for Switching Navigation Mode between Car Navigation Mode and Personal Navigation Mode in Navigation Device” filed in the Korean Intellectual Property Office on May 19, 2005 and assigned Serial No. 2005-42075, the entire contents of which are hereby incorporated herein by reference.
- 1. Field of the Invention
- The present invention relates generally to a navigation system supporting vehicle navigation and personal navigation, and in particular, to an apparatus and method for switching a navigation mode between a vehicle navigation mode and a personal navigation mode in a navigation device supporting vehicle navigation and personal navigation.
- 2. Description of the Related Art
- Vehicle navigation systems, for example a car navigation system, recognizes a current position of a user's car. It provides an optimal route to a user's desired destination to the user, and guides the user along the optimal route. Generally, car navigation calculates the current position of the car using a Global Positioning System (GPS) sensor and a Dead Reckoning (DR) sensor and guides a route from the current position to the destination.
- Personal navigation devices guide a route for a walker, and is similar to car navigation. But unlike car navigation, it requires more accurate position measurement and more detailed route guiding because the speed of the walker is generally slower than that of the car.
- Thus, car navigation and personal navigation perform route guiding using different navigation algorithms. For example, car navigation recognizes a current position of a car by directly integrating outputs of an accelerometer sensor, whereas personal navigation detects steps of a walker to recognize a current position of the walker. For this reason, car navigation and personal navigation use separate dedicated navigation devices for performing different algorithms or are implemented to operate different algorithms separately even when using one navigation device.
- The use of separate navigation devices for car navigation and personal navigation increases cost and causes inconvenience. To solve the problem, a navigation device supporting both car navigation and personal navigation has been recently developed.
- However, in conventional navigation devices supporting car navigation and personal navigation, a user is required to manually perform mode switching between car navigation and personal navigation. In other words, the user manually terminates car navigation and initiates personal navigation to use personal navigation during the use of car navigation, and vice versa.
- As a result, conventional navigation devices cause inconvenience because the user has to separately input car navigation information and personal navigation information. Moreover, when the user mistakenly switches to car navigation for personal navigation or vice versa, it may result in wrong route guiding.
- Therefore, it is an object of the present invention to provide an apparatus and method for switching a navigation mode between a vehicle navigation mode and a personal navigation mode in a navigation device supporting vehicle navigation and personal navigation, in which mode switching is automatically performed without a user's manipulation.
- It is another object of the present invention to provide an apparatus and method for switching a navigation mode between a vehicle navigation mode and a personal navigation mode in a navigation device supporting vehicle navigation and personal navigation, in which the navigation device determines whether a user uses a vehicle, such as a car, or walks. Upon such determination the navigation device automatically performs the appropriate mode switching.
- According to one aspect of the present invention, there is provided an apparatus for switching a navigation mode between a vehicle navigation mode and a personal navigation mode in a navigation device. The apparatus includes a personal navigation algorithm for implementing a personal navigation mode, a vehicle navigation algorithm for implementing a vehicle navigation mode, an external device interface for connecting the navigation device and an external device, a speed measuring unit for providing a speed of the navigation device, a step detecting unit for detecting a step according to movement of the navigation device, and a navigation algorithm controller for switching the navigation mode between the vehicle navigation mode and the personal navigation mode. The switching of the navigation mode is done according to whether the navigation device is mounted in a navigation device holder through the external device interface, whether the speed of the navigation device is greater than a predetermined speed threshold, and whether a step is detected by the step detecting unit.
- According to another aspect of the present invention, there is provided a method for switching a navigation mode between a vehicle navigation mode and a personal navigation mode in a navigation device. The method includes executing a navigation program upon request from a user and determining whether the navigation device is mounted in a navigation device holder, switching the navigation mode to the vehicle navigation mode if the navigation device is mounted in the navigation device holder and acquiring a speed of the navigation device if the navigation device is not mounted in the navigation device holder, switching the navigation mode to the vehicle navigation mode if the speed of the navigation device is greater than a predetermined speed threshold and acquiring a measured acceleration of the navigation device if the speed of the navigation device is less than a predetermined speed threshold, and determining whether a step is detected according to the recognition result, switching the navigation mode to the vehicle navigation mode if a step is not detected, and switching the navigation mode into the personal navigation mode if a step is detected.
- The above and other objects, features, and advantages of certain exemplary embodiments of the present invention will be more apparent from the following description taken in conjunction with the accompanying drawings, in which:
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FIG. 1 is a block diagram of a navigation device according to the present invention; -
FIG. 2 is a flowchart illustrating mode switching between a vehicle navigation mode and a personal navigation mode according to a first embodiment of the present invention; -
FIG. 3 is a flowchart illustrating mode switching between a vehicle navigation mode and a personal navigation mode according to a second embodiment of the present invention; -
FIG. 4 is a flowchart illustrating mode switching between a vehicle navigation mode and a personal navigation mode according to a third embodiment of the present invention; -
FIG. 5 is a flowchart illustrating mode switching between a vehicle navigation mode and a personal navigation mode according to a fourth embodiment of the present invention; and -
FIG. 6 is a flowchart illustrating a process of setting a speed threshold and a step detected number threshold for a vehicle/personal mode determination according to the present invention. - The matters defined in the description such as a detailed construction and elements are provided to assist in a comprehensive understanding of the exemplary embodiments of the invention. Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the embodiments described herein can be made without departing from the scope and spirit of the invention. Similarly those of ordinary skills in the art will recognize that a preferred embodiment of the present invention is provided with reference to a vehicle navigation method and device, an example of which is a car navigation method and device. Also, descriptions of well-known functions and constructions are omitted for clarity and conciseness.
- In the present invention, a navigation device performing navigation of a vehicle, such as a car, and personal navigation and automatically switching between vehicle navigation and personal navigation modes is provided. For simplicity of explanation, the vehicle navigation device and method of the present invention will hereinafter be referred to as a car navigation device and method.
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FIG. 1 is a block diagram of a navigation device according to the present invention. Referring toFIG. 1 , the navigation device includes a Global Positioning System (GPS)receiver 102, anaccelerometer 104, anavigation algorithm controller 112, auser interface 106, and anexternal device interface 108. - The
GPS receiver 102 receives a GPS signal from a GPS satellite and provides a GPS speed of the navigation device using position information and time information included in the GPS signal. - The
accelerometer 104 may be a three-axis accelerometer and measures as well as outputs a speed according to movement of the navigation device. - The
user interface 106 may be an input device such as a keypad or a touch panel and interfaces with a user. For example, theuser interface 106 receives a navigation program execution request from the user and transmits the same to thenavigation algorithm controller 112. - The
external device interface 108 is a connector between the navigation device and an external device and performs interfacing between the navigation device and an external device in a serial communication manner such as Universal Asynchronous Receiver Transmitter (UART) or Universal Serial Bus (USB). For example, theexternal device interface 108 connects and interfaces the navigation device with anavigation device holder 110 or a navigation device charger (e.g., a cigar jack). - The
navigation algorithm controller 112 which includes acar navigation algorithm 114 and apersonal navigation algorithm 116, executes a corresponding navigation program in response to a navigation program execution request, and determines whether a current mode is a car mode or a personal mode according to a predetermined criterion. - For example, the
navigation algorithm controller 112 determines whether the current mode is the car mode or the personal mode according to whether the navigation device is mounted in thenavigation device holder 110, the GPS speed provided by theGPS receiver 102 is higher than a predetermined speed, and a step is detected based on a measured acceleration. If the current mode is determined to be the car mode, thenavigation algorithm controller 112 switches a navigation mode to a car navigation mode that implements thecar navigation algorithm 114. If the current mode is determined to be the personal mode, thenavigation algorithm controller 112 switches a navigation mode to a personal navigation mode that implements thepersonal navigation algorithm 116. - In switching between the car navigation mode and the personal navigation mode, the
car navigation algorithm 114 and thepersonal navigation algorithm 116 provide position information, speed information, and azimuth information to an algorithm corresponding to the switched mode. In other words, in switching between the car navigation mode and the personal navigation mode, thecar navigation algorithm 114 and thepersonal navigation algorithm 116 provide acceleration data logs measured by theaccelerometer 104 for 1-10 seconds and position, speed, and azimuth data logs measured by a GPS for 1-10 seconds to an algorithm corresponding to the switched mode. A data rate time unit is used in thecar navigation algorithm 114 and thepersonal navigation algorithm 116. A data log measured for 1 second is provided when a data rate is higher than 50 Hz and a data log measured for 10 seconds is provided when a data rate is lower than 10 Hz. - Previous sensor data is required for calculation of a reference value or a median value of a sensor in the car navigation mode and is required for step detection and pace estimation in the personal navigation mode. Thus, previous sensor data is exchanged in switching between the car navigation mode and the personal navigation mode.
- The data rate means the data rate of a sensor and is a period of the output of an accelerometer and a terrestrial magnetic sensor. The
car navigation algorithm 114 and thepersonal navigation algorithm 116 require sensor values whose number is greater than a predetermined number, i.e., successive sensor values whose number is greater than a predetermined number. Thus, data measured for a long time (e.g., 10 seconds) is secured in case of low data rate and data measured for a short time (e.g., 1 second) is secured in case of high data rate to fit in the required total number of data values. - For example, the
car navigation algorithm 114 terminates car navigation upon request for switching to the personal navigation mode while performing car navigation and provides position, speed, and azimuth data of the navigation device to thepersonal navigation algorithm 116. Thepersonal navigation algorithm 116 subsequently then performs personal navigation from car navigation, using the data provided from thecar navigation algorithm 114. - The
personal navigation algorithm 116 terminates personal navigation upon request for switching to the car navigation mode while performing personal navigation and provides position, speed, and azimuth data of the navigation device to thecar navigation algorithm 114. Thecar navigation algorithm 114 subsequently then performs car navigation from personal navigation, using the data provided from thepersonal navigation algorithm 116. - Hereinafter is a description of a method for switching a navigation mode between the car navigation mode and the personal navigation mode in a navigation device according to the present invention.
- According to a first embodiment of the present invention, the navigation device performs mode switching between the car navigation mode and the personal navigation mode according to whether the navigation device is mounted in the
navigation device holder 110. -
FIG. 2 is a flowchart illustrating mode switching between the car navigation mode and the personal navigation mode according to the first embodiment of the present invention. Referring toFIG. 2 , the navigation device executes a navigation program in response to a navigation program execution request from a user instep 202. Upon execution of the navigation program, the navigation device determines whether it is mounted in thenavigation device holder 110 instep 204. The navigation device can make a determination using a mechanical method and a message transmission method. - According to the mechanical method, the navigation device determines whether it is mounted in the
navigation device holder 110 by checking if a button in a portion of the navigation device that physically contacts thenavigation device holder 110 is depressed. The navigation device determines that it is mounted in thenavigation device holder 110 if the button is depressed. If the button is not depressed, the navigation device determines that it is separated from thenavigation device holder 110. - According to the message transmission method, the navigation device transmits a holder ID request message to the
navigation device holder 110 through theexternal device interface 108 and determines whether it is mounted in thenavigation device holder 110 by checking if a holder ID or an interrupt message is received as a response to the request message. If the holder ID or the interrupt message is received, the navigation device determines that it is mounted in thenavigation device holder 110. If the holder ID or the interrupt message is not received, the navigation device determines that it is separated from thenavigation device holder 110. However, the navigation device may fail to receive the holder ID or the interrupt message from thenavigation device holder 110. Thus, every 10 seconds the navigation device repetitively transmits the holder ID request message to thenavigation device holder 110. Upon receipt of the holder ID or the interrupt message, the navigation device determines that it is mounted in thenavigation device holder 110. When the navigation device is determined to be mounted in thenavigation device holder 110, it continuously transmits the holder ID request message every 30 seconds to thenavigation device holder 110 to determine whether it is separated from thenavigation device holder 110. - If the navigation device is determined to be mounted in the
navigation device holder 110, it switches a navigation mode to the car navigation mode instep 206 and then performs car navigation using thecar navigation algorithm 114. - If the navigation device is determined to be separated from the
navigation device holder 110, it switches a navigation mode to the personal navigation mode instep 208 and then performs personal navigation using thepersonal navigation algorithm 116. - According to a second embodiment of the present invention, the navigation device performs mode switching between the car navigation mode and the personal navigation mode according to whether a GPS speed provided by the
GPS receiver 102 is higher than a predetermined speed. -
FIG. 3 is a flowchart illustrating mode switching between the car navigation mode and the personal navigation mode according to the second embodiment of the present invention. Referring toFIG. 3 , the navigation device executes a navigation program in response to a navigation program execution request from the user instep 402. Upon execution of the navigation program, the navigation device acquires GPS speed information from theGPS receiver 102 instep 404. - The navigation device then determines whether the acquired GPS speed is high in
step 406. In other words, the navigation device determines whether the acquired GPS speed is higher than a predetermined speed threshold. The GPS speed has a limit in the personal navigation mode, since a user will either walk or run while carrying the navigation device. Thus, the navigation device assumes that the maximum speed of a walker is about 25 km/h and sets 25 km/h as a speed threshold. The navigation device determines that the GPS speed is high when the GPS speed is higher than the speed threshold. If the GPS speed is lower than the speed threshold, the navigation device determines that the GPS speed is low. - When the GPS speed is high, the navigation device determines that the current mode is the car mode and switches a navigation mode to the car navigation mode in
step 408. The navigation device then performs car navigation using thecar navigation algorithm 114. If the GPS speed is not high, the navigation device determines that the current mode is the personal mode and switches a navigation mode to the personal navigation mode instep 410. The navigation device then performs personal navigation using thepersonal navigation algorithm 116. - According to a third embodiment of the present invention, the navigation device performs mode switching between the car navigation mode and the personal navigation mode according to whether a step is detected using an output of the
accelerometer 104. -
FIG. 4 is a flowchart illustrating mode switching between the car navigation mode and the personal navigation mode according to the third embodiment of the present invention. Referring toFIG. 4 , the navigation device executes a navigation program in response to a navigation program execution request from the user instep 502. The navigation device acquires an acceleration measured by theaccelerometer 104 instep 504. - The navigation device recognizes a step pattern using the measured acceleration in
step 506. When a user walks, an acceleration measured by theaccelerometer 104 is output as a frequency waveform of a predetermined pattern in which an acceleration component toward the center of the earth, i.e., an acceleration magnitude toward the center of the earth is greater than ±0.5 g(g=9.8 m/s, earth gravitational acceleration). However, when the user uses a car, a specific waveform greater than 0.5 g of an acceleration measured by theaccelerometer 104 is not output as a frequency waveform of the predetermined pattern. Thus, the navigation device checks if an acceleration measured by theaccelerometer 104 is output as a frequency waveform of the predetermined pattern to recognize a step pattern. A step detection algorithm for recognizing the step pattern may be various well-known step detection methods including a zero-crossing method. - The navigation device determines whether a step is detected in
step 508. If a step is not detected, the navigation device determines that the user is not walking and switches a navigation mode to the car navigation mode instep 510. The navigation device implements the car navigation mode using thecar navigation algorithm 114. If a step is detected, the navigation device determines that the user is walking and switches a navigation mode to the personal navigation mode instep 512. The navigation device implements the personal navigation mode using thepersonal navigation algorithm 116. - According to a fourth embodiment of the present invention, the navigation device performs mode switching between the car navigation mode and the personal navigation mode according to whether the navigation device is mounted in the
navigation device holder 110, whether a GPS speed provided by theGPS receiver 102 is higher than a predetermined speed, and whether a step is detected using an output of theaccelerometer 104. According to a fifth embodiment of the present invention, since a navigation mode is likely to be the car navigation mode when the user is on a driveway or an express highway, a reference value for a GPS speed and a reference value for an acceleration measured by theaccelerometer 104 for car/personal mode determination are set useful for determination of the car navigation mode. Mode switching between the car navigation mode and the personal navigation mode is performed according to the reference values. -
FIG. 5 is a flowchart illustrating mode switching between the car navigation mode and the personal navigation mode according to the fourth embodiment of the present invention. Referring toFIG. 5 , the navigation device executes a navigation program in response to a navigation program execution request from the user instep 602. - The navigation device determines whether it is mounted in the
navigation device holder 110 instep 604 as described aboutstep 204 with reference toFIG. 2 . - If the navigation device is mounted in the
navigation device holder 110, it determines that the current mode is the car mode and switches the navigation mode to the car navigation mode instep 620. The navigation device then performs car navigation using thecar navigation algorithm 114. - If the navigation device is not mounted in the
navigation device holder 110, it sets a speed threshold α and a step detected number threshold β for car/personal mode determination instep 608. -
FIG. 6 is a flowchart illustrating a process of setting the speed threshold α and the step number detection threshold β for car/personal mode determination according to the present invention. Referring toFIG. 6 , the navigation device detects a user's position instep 702. The navigation device can detect the user's position using a GPS signal received by theGPS receiver 102. The navigation device determines whether the user's position is a road way instep 704. In other words, the navigation device determines whether the user is on a driveway or an express highway. This is because the user is likely to use car navigation when on a road way and is likely to use personal navigation when not on a road way. - If the user is on a road way, the navigation device sets the GPS speed threshold a greater than a default value and the step detected number threshold β less than a default value. In other words, when the user is on a road way, the navigation device sets the GPS speed threshold α and the step detected number threshold β to values useful for determination of the car navigation mode.
- When the user is not on a road way, the navigation device sets the GPS speed threshold α and the step detected number threshold β to default values in
step 708 or may set the GPS speed threshold α less than a default value and the step detected number threshold β greater than a default value usefully for determination of the personal navigation mode. - After setting the GPS speed threshold α and the step detected number threshold β, the navigation device acquires GPS speed information from the
GPS receiver 102 instep 610. - The navigation device determines whether the acquired GPS speed is greater than the set GPS speed threshold α in
step 612. If the acquired GPS speed is greater than the set GPS speed threshold α, it means that the GPS speed is high. Thus, the navigation device determines that the current mode is the car mode and switches a navigation mode to the car navigation mode instep 620. The navigation device then performs car navigation using thecar navigation algorithm 114. - If the acquired GPS speed is less than the set GPS speed threshold α, it means that the GPS speed is low. Thus, the navigation device determines that the current mode is not the car mode and performs step detection for car/personal mode determination in
step 614. In other words, the navigation device recognizes a step pattern using an acceleration measured by theaccelerometer 104 and performs step detection according to the recognition result. - The navigation device determines whether the number of detected steps is greater than the set step detected number threshold β in
step 616. If the number of detected steps is less than the set step detected number threshold β, the navigation device determines that the user is not walking and switches the navigation mode to the car navigation mode instep 620. The navigation device then performs car navigation using thecar navigation algorithm 114. - If the number of detected steps is greater than the set step detected number threshold β, the navigation device determines that the user is walking and switches the navigation mode to the personal navigation mode in
step 618. The navigation device then performs personal navigation using thepersonal navigation algorithm 116. - As described above, according to the present invention, switching between a car navigation mode and a personal navigation mode is automatically performed in a single navigation device, thereby alleviating inconvenience of requiring the user's manual mode switching.
- Moreover, in switching between the car navigation mode and the personal navigation mode, an algorithm provides position, velocity, and azimuth data of the navigation device to another algorithm corresponding to a switched mode. Thus, personal navigation is subsequently automatically performed from car navigation or car navigation is subsequently automatically performed from personal navigation.
- Furthermore, once a navigation program is executed, the navigation device automatically switches between the car navigation mode and the personal navigation mode. Thus, the user does not need to perform manual mode switching on a way from a departure to a destination.
- While the present invention has been shown and described with reference to preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.
Claims (52)
1. An apparatus for switching a navigation mode between a vehicle navigation mode and a personal navigation mode in a navigation device, the apparatus comprising:
a personal navigation algorithm for implementing a personal navigation mode;
a vehicle navigation algorithm for implementing a vehicle navigation mode;
an external device interface for connecting the navigation device and an external device; and
a navigation algorithm controller for switching the navigation mode between the vehicle navigation mode and the personal navigation mode according to whether the navigation device is mounted in a navigation device holder through the external device interface.
2. The apparatus of claim 1 , wherein the navigation algorithm controller determines whether the navigation device is mounted in the navigation device holder by checking if a button of the navigation device for sensing mounting of the navigation device is depressed.
3. The apparatus of claim 1 , wherein the navigation algorithm controller determines whether the navigation device is mounted in the navigation device holder by checking if a message indicating mounting of the navigation device is received from the navigation device holder.
4. The apparatus of claim 1 , wherein the vehicle is a car.
5. An apparatus for switching a navigation mode between a vehicle navigation mode and a personal navigation mode in a navigation device, the apparatus comprising:
a personal navigation algorithm for implementing a personal navigation mode;
a vehicle navigation algorithm for implementing a vehicle navigation mode;
a speed measuring unit for providing a speed of the navigation device; and
a navigation algorithm controller for switching the navigation mode between the vehicle navigation mode and the personal navigation mode according to whether the speed of the navigation device is greater than a predetermined speed threshold.
6. The apparatus of claim 5 , wherein the speed measuring unit is a Global Positioning System (GPS) receiver for receiving a GPS signal and providing a GPS speed.
7. The apparatus of claim 5 , wherein the predetermined speed threshold is statistically determined according to experimental results.
8. The apparatus of claim 7 , wherein if the navigation device is on a road way, the predetermined speed threshold is set less than a statistical value.
9. The apparatus of claim 5 , wherein the vehicle is a car.
10. An apparatus for switching a navigation mode between a vehicle navigation mode and a personal navigation mode in a navigation device, the apparatus comprising:
a personal navigation algorithm for implementing a personal navigation mode;
a vehicle navigation algorithm for implementing a vehicle navigation mode;
a step detecting unit for detecting a step according to movement of the navigation device; and
a navigation algorithm controller for switching the navigation mode between the vehicle navigation mode and the personal navigation mode according to whether a step is detected by the step detecting unit.
11. The apparatus of claim 10 , wherein the step detecting unit comprises an accelerometer for measuring an acceleration according to movement of the navigation device and outputting the measured acceleration and detects a step using the measured acceleration.
12. The apparatus of claim 10 , wherein the step detecting unit detects a step using a zero-crossing method.
13. The apparatus of claim 10 , wherein if a step is detected, the navigation algorithm controller determines whether the number of detected steps is greater than a predetermined step detected number and switches the navigation mode to the personal navigation mode if the number of detected steps is greater than the predetermined step detected number threshold.
14. The apparatus of claim 13 , wherein the predetermined step detected number threshold is statistically determined according to experimental results.
15. The apparatus of claim 14 , wherein if the navigation device is on a road way, the predetermined step detected number threshold is set greater than a statistical value.
16. The apparatus of claim 10 , wherein the vehicle is a car.
17. An apparatus for switching a navigation mode between a vehicle navigation mode and a personal navigation mode in a navigation device, the apparatus comprising:
a personal navigation algorithm for implementing a personal navigation mode;
a vehicle navigation algorithm for implementing a vehicle navigation mode;
an external device interface for connecting the navigation device and an external device;
a speed measuring unit for providing a speed of the navigation device;
a step detecting unit for detecting a step according to movement of the navigation device; and
a navigation algorithm controller for switching the navigation mode between the vehicle navigation mode and the personal navigation mode according to whether the navigation device is mounted in a navigation device holder through the external device interface, whether the speed of the navigation device is greater than a predetermined speed threshold, and whether a step is detected by the step detecting unit.
18. The apparatus of claim 17 , wherein the navigation algorithm controller determines whether the navigation device is mounted in the navigation device holder by checking if a button of the navigation device for sensing mounting of the navigation device is depressed.
19. The apparatus of claim 17 , wherein the navigation algorithm controller determines whether the navigation device is mounted in the navigation device holder by checking if a message indicating mounting of the navigation device is received from the navigation device holder.
20. The apparatus of claim 17 , wherein the speed measuring unit is a Global Positioning System (GPS) receiver for receiving a GPS signal and providing a GPS speed.
21. The apparatus of claim 17 , wherein the predetermined speed threshold is statistically determined according to experimental results.
22. The apparatus of claim 21 , wherein if the navigation device is on a road way, the predetermined speed threshold is set less than a statistical value.
23. The apparatus of claim 17 , wherein the step detecting unit comprises an accelerometer for measuring an acceleration according to movement of the navigation device and outputting the measured acceleration and detects a step using the measured acceleration.
24. The apparatus of claim 17 , wherein the step detecting unit detects a step using a zero-crossing method.
25. The apparatus of claim 17 , wherein the vehicle is a car.
26. The apparatus of claim 17 , wherein if a step is detected, the navigation algorithm controller determines whether the number of detected steps is greater than a predetermined step detected number and switches the navigation mode to the personal navigation mode if the number of detected steps is greater than the predetermined step detected number threshold.
27. The apparatus of claim 26 , wherein the predetermined step detected number threshold is statistically determined according to experimental results.
28. The apparatus of claim 27 , wherein if the navigation device is on a road way, the predetermined step detected number threshold is set greater than a statistical value.
29. A method for switching a navigation mode between a vehicle navigation mode and a personal navigation mode in a navigation device, the method comprising the steps of:
executing a navigation program upon request from a user and determining whether the navigation device is mounted in a navigation device holder; and
switching the navigation mode to the vehicle navigation mode if the navigation device is mounted in the navigation device holder and switching the navigation mode to the personal navigation mode if the navigation device is not mounted in the navigation device holder.
30. The method of claim 29 , wherein the step of determining whether the navigation device is mounted in the navigation device holder comprises
checking if a button of the navigation device for sensing mounting of the navigation device is depressed; and
determining that the navigation device is mounted in the navigation device holder if the button is pressed and determining that the navigation device is not mounted in the navigation device holder if the button is not depressed.
31. The method of claim 29 , wherein the step of determining whether the navigation device is mounted in the navigation device holder comprises
checking if a message indicating mounting of the navigation device is received from the navigation device holder; and
determining that the navigation device is mounted in the navigation device holder if the message is received and determining that the navigation device is not mounted in the navigation device holder if the message is not received.
32. The method of claim 29 , wherein the vehicle is a car.
33. A method for switching a navigation mode between a vehicle navigation mode and a personal navigation mode in a navigation device, the method comprising the steps of:
executing a navigation program upon request from a user and acquiring a speed of the navigation device;
switching the navigation mode to the vehicle navigation mode if the speed of the navigation device is greater than a predetermined speed threshold and switching the navigation mode into the personal navigation mode if the speed of the navigation device is less than a predetermined speed threshold.
34. The method of claim 33 , wherein the predetermined speed threshold is statistically determined according to experimental results.
35. The method of claim 34 , wherein if the navigation device is on a road way, the predetermined speed threshold is set less than a statistical value.
36. The method of claim 33 , wherein the vehicle is a car.
37. A method for switching a navigation mode between a vehicle navigation mode and a personal navigation mode in a navigation device, the method comprising the steps of:
executing a navigation program upon request from a user and acquiring a measured acceleration of the navigation device;
recognizing a step pattern using the measured acceleration;
determining whether a step is detected according to the recognition result; and
switching the navigation mode to the vehicle navigation mode if a step is not detected and switching the navigation mode into the personal navigation mode if a step is detected.
38. The method of claim 37 , wherein a step is detected using a zero-crossing method.
39. The method of claim 37 , further comprising determining whether the number of detected steps is greater than a predetermined step detected number if a step is detected; and
switching the navigation mode to the personal navigation mode if the number of detected steps is greater than the predetermined step detected number threshold.
40. The method of claim 39 , wherein the predetermined step detected number threshold is statistically determined according to experimental results.
41. The method of claim 40 , wherein if the navigation device is on a road way, the predetermined step detected number threshold is set greater than a statistical value.
42. The method of claim 37 , wherein the vehicle is a car.
43. A method for switching a navigation mode between a vehicle navigation mode and a personal navigation mode in a navigation device, the method comprising the steps of:
executing a navigation program upon request from a user and determining whether the navigation device is mounted in a navigation device holder; switching the navigation mode to the vehicle navigation mode if the navigation device is mounted in the navigation device holder and acquiring a speed of the navigation device if the navigation device is not mounted in the navigation device holder;
switching the navigation mode to the vehicle navigation mode if the speed of the navigation device is greater than a predetermined speed threshold and acquiring a measured acceleration of the navigation device if the speed of the navigation device is less than a predetermined speed threshold; and
determining whether a step is detected according to the recognition result, switching the navigation mode to the vehicle navigation mode if a step is not detected, and switching the navigation mode into the personal navigation mode if a step is detected.
44. The method of claim 43 , wherein the step of determining whether the navigation device is mounted in the navigation device holder comprises
checking if a button of the navigation device for sensing mounting of the navigation device is pressed; and
determining that the navigation device is mounted in the navigation device holder if the button is pressed and determining that the navigation device is not mounted in the navigation device holder if the button is not depressed.
45. The method of claim 43 , wherein the step of determining whether the navigation device is mounted in the navigation device holder comprises:
checking if a message indicating mounting of the navigation device is received from the navigation device holder; and
determining that the navigation device is mounted in the navigation device holder if the message is received and determining that the navigation device is not mounted in the navigation device holder if the message is not received.
46. The method of claim 43 , wherein the predetermined speed threshold is statistically determined according to experimental results.
47. The method of claim 43 , wherein if the navigation device is on a road way, the predetermined speed threshold is set less than a statistical value.
48. The method of claim 43 , further comprising
determining whether the number of detected steps is greater than a predetermined step detected number if a step is detected; and
switching the navigation mode to the personal navigation mode if the number of detected steps is greater than the predetermined step detected number threshold.
49. The method of claim 48 , wherein the predetermined step detected number threshold is statistically determined according to experimental results.
50. The method of claim 49 , wherein if the navigation device is on a road way, the predetermined step detected number threshold is set greater than a statistical value.
51. The method of claim 43 , wherein a step is detected using a zero-crossing method.
52. The method of claim 43 , wherein the vehicle is a car.
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KR100735192B1 (en) | 2007-07-03 |
US10060748B2 (en) | 2018-08-28 |
US20170089708A1 (en) | 2017-03-30 |
US20160202080A1 (en) | 2016-07-14 |
CN100590385C (en) | 2010-02-17 |
EP1731874A3 (en) | 2010-10-27 |
EP1731874A2 (en) | 2006-12-13 |
US9551584B2 (en) | 2017-01-24 |
EP1731874B1 (en) | 2012-03-21 |
US20130304375A1 (en) | 2013-11-14 |
US9316500B2 (en) | 2016-04-19 |
CN1865859A (en) | 2006-11-22 |
KR20060120305A (en) | 2006-11-27 |
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