CN103198284A - Active radio frequency identification device (RFID) positioning card reader based on micro-strip array directing antenna array positioning - Google Patents
Active radio frequency identification device (RFID) positioning card reader based on micro-strip array directing antenna array positioning Download PDFInfo
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- CN103198284A CN103198284A CN2012101006379A CN201210100637A CN103198284A CN 103198284 A CN103198284 A CN 103198284A CN 2012101006379 A CN2012101006379 A CN 2012101006379A CN 201210100637 A CN201210100637 A CN 201210100637A CN 103198284 A CN103198284 A CN 103198284A
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Abstract
The invention discloses an active radio frequency identification device (RFID) positioning card reader based on a micro-strip secondary array narrow-angle directing antenna array of directing antenna array positioning. The active RFID positioning card reader comprises an antenna and a card reading processing device, wherein the antenna and the card reading processing device are in signal connection, and the antenna is the micro-strip secondary array antenna array. The micro-strip secondary array antenna array is divided into a plurality of narrow solid angle micro-strip array narrow-angle directing antennas, and the plurality of narrow solid angle micro-strip array narrow-angle directing antennas is used for receiving an active RFID card signal of ultrahigh frequency carrier high frequency compression sent information carried by an ambulatory human or a low-speed moving object to carry out positioning card reading. The active RFID positioning card reader is suitable for carrying out the positioning card reading on an active RFID card which is capable of sending information with moderate transmitted power and an ultrahigh frequency carrier in a higher frequency compression mode in a certain range of space. A single active RFID positioning card reader is used, direction and corresponding position of the RFID card in a certain area can be confirmed, and more than two positioning card readers are used to read a card in a networking cross mode, the position of the active RFID card can be confirmed accurately, or a range of positioning card reading can be expanded.
Description
Technical field
The present invention relates to a kind of directional antenna battle array active RFID location, the narrow angle of little band secondary array card reader based on directional antenna battle array location, adopt the ultrahigh frequency band micro-strip array antenna to reach narrow angle and point to reception, by being directional antenna array and the receiving chip array of correspondence and the coordinate position that active RFID card information and the definite card of calculating are read in the embedded computer processing controls that the space multistory angle distributes in length and breadth, belong to infotech RFID positioning field.
Background technology
Social RFID technology has been widely used in people's the life now, as identity document, the voucher of withholing, come in and go out badge, kinds of goods identity and parameter call tag, add environmental information perception transmitter behind the sensor, proximity bluetooth, away from the main mechanics of communication of equipment facilities such as attention device.In objects carried by people, in the buildings, in the means of transportation, in the warehouse harbour, in market and the workplace, the RFID The Application of Technology is arranged, even may develop in the every aspect and go.To RFID technology commonly used like this, if give active induction location is carried out in the position of rfid card or RFID label, to know identity information and the position coordinates of its representative, this is that information society is in demand.But present rfid card location technology also is not so good as people's will.
Existing rfid card location technology, mainly contain following several: a kind of is the reading/writing distance that utilizes the passive RFID card very near, distance has only about tens centimetres, if the location aware of card reader, read near card just can determine that this is stuck in, but this only is the information of putting, and can not obtain this time to read the track between reading next time, want the zone to need very a large amount of card reader in the location in detail, so this method has only some special applications.Second kind is to be evenly arranged in the zone with many active RFID card reader that can survey radio-frequency (RF) signal strength, the communication reading/writing distance of active RFID card and card reader reaches more than tens meters, big zone is after a plurality of card reader of finding range are arranged in the position of determining, the active RFID card that enters can be simultaneously read the signal that card sends by several card reader and is surveyed simultaneously and block the signal amplitude size of sending, because the square root of signal amplitude and the air line distance of the two are inversely proportional to, each card reader can both be calculated from the air line distance of card according to signal amplitude, therefore in the space according to the position of several card reader with read the card of calculating apart from using geometric formula just can calculate the locus of this card; This method is affected by environment big, may be effectively in very big spacious occasion, in the zone of less room and band metalwork since electromagnetic wave can be subjected to metal and wall on every side mirror image interference, reflection, diffraction, penetrate decay and the factors such as amplitude fluctuations of itself may seriously be forbidden the signal amplitude respective distances of measuring, positioning error is very big as a result may have several meters or bigger.The third method is to arrange the active RFID card reader that can accurately survey signal amplitude in a zone (room), and then evenly arrange the similar active RFID card of many definite positions, these auxiliary positioning are stuck in to measure definite respective signal amplitude in the card reader, active RFID card when a need location enters in this zone, its signal that sends is received and measures the signal amplitude that receives by card reader, card reader with this amplitude be arranged in the supplementary card signal amplitude comparison of determining the position and calculate in this regional or indoor locus; This method has been improved the reference frame that receives the signal estimation distance, but still can be subjected to wall, facility, the metal object of space distribution and carry the people of rfid card to the interference of electromagnetic wave amplitude, make signal amplitude and the reference by location amplitude received differ inaccurate more greatly and relatively, range distribution causes error not according to calculated relationship, the error of generation can be more than 3 meters.The digital signal ranging technology that other locator meamss are developing in addition positions, but because the characteristics of RFID technology are that rfid card is dirt cheap, the complicacy and the cost that increase digital form range finding back card will increase greatly, deviate from the aim of promoting the RFID technology, also do not seen application at present.
Summary of the invention
The object of the present invention is to provide a kind of directional antenna battle array active RFID location, the narrow angle of little band secondary array card reader based on directional antenna battle array location, employing ultrahigh frequency band micro-strip array antenna reaches the sensing of narrow angle and receives, by being directional antenna array and the receiving chip array of correspondence and the coordinate position that active RFID card information and the definite card of calculating are read in the embedded computer processing controls that the space multistory angle distributes in length and breadth.The space that it is useful in certain limit can stick into row location Card Reader with the active RFID of high-frequency compression transmission information with moderate emissive power and UHF carrier to what the people that walks about or low speed mobile object carried, can determine orientation and the correspondence position of this class rfid card in certain zone with this single card reader, more than two location card reader networking intersect Card Reader just can more accurate definite position or expansion locate the scope of Card Reader.
Technical matters solved by the invention can realize by the following technical solutions:
A kind of directional antenna battle array active RFID location, the narrow angle of little band secondary array card reader based on directional antenna battle array location, comprise antenna and Card Reader treating apparatus, described antenna is connected with Card Reader treating apparatus signal, it is characterized in that described antenna is a little band secondary array antenna battle array that distributes in this card reader space, directional antenna battle array active RFID location, narrow angle of little band secondary array receiving angle.
Described little band secondary array antenna battle array is divided into the narrow angle of the microstrip array directional antenna of several narrow solid angles, and the active RFID card signal that the narrow angle of the microstrip array of several narrow solid angles directional antenna is responsible for receiving the UHF carrier high-frequency compression transmission information of being carried by the people who walks about or low speed mobile object positions Card Reader.
The narrow angle of the microstrip array of described narrow solid angle directional antenna is with narrow angle directional antenna for the array according to the frequency range design that receives declines.
It is arranged evenly by space multistory angle fan profile according to the Card Reader angular range of card reader requirement that described several arrays decline with narrow angle directional antenna, and each several arrays are declined with the seamless Card Reader of being responsible for each dimensional orientation of narrow angle directional antenna.Further, each space multistory angle that several arrays of the narrow angle of described little band secondary array directional antenna battle array active RFID location card reader decline and can be responsible for the Card Reader scope by fan type various distressed structures arranged evenly with narrow angle directional antenna, if array declines more narrow with the angle of narrow angle directional antenna, the array of whole little band secondary array antenna array declines and is with the narrow angle directional antenna array number will be more many, bearing accuracy is also higher, and antenna area can be bigger.
Each several array decline be with narrow angle directional antenna by dozens of take advantage of dozens of microstrip antenna unit in accordance with regulations spacing in length and breadth compact arrangement form.The microstrip antenna unit number of array is determined that by bearing accuracy the microstrip antenna unit of array is more many, and the main lobe receiving angle of array antenna is just more narrow, and the more for a short time zone that makes short distance reception be regardless of direction of secondary lobe is more few, and bearing accuracy is corresponding improve all.
Press λ/4 spacings compactness arranged evenly on dielectric-slab for the gold-plated microstrip antenna of miniaturization in described microstrip antenna unit.But receive to reach the electromagnetic high-gain of the communication frequency that narrow corner connection debit is made progress, and the space electromagnetic wave outside the narrow angle is received the nothing gain, thereby obtain to determine that the sensing at the narrow space multistory of angle angle receives.
Each array declines the carrier wave RFID signal that receives in each microstrip antenna unit all to be delivered to the little receiving chip that detects with the corresponding band of narrow angle directional antenna of this array by feeder line with narrow angle directional antenna and carries out the mixing demodulation, and the receiving chip of this band detection receives detection the peak-to-peak value of carrier wave RFID signal of each microstrip antenna unit and weighting effective value as signal amplitude.
The receiving chip that described band detects is set the carrier wave RFID signal amplitude input threshold value of a mixing demodulation.Carrier wave RFID signal amplitude input threshold value by setting a mixing demodulation to be to improve accuracy and signal to noise ratio (S/N ratio), deadens noise signals such as the deamplification that penetrates into from wall and mirror image interference; The receiving chip of band detection is set the carrier wave RFID signal amplitude input threshold value of a mixing demodulation and is determined threshold size in addition, the edge at each the narrow space multistory angle that several arrays is declined receive with narrow angle directional antenna connects but does not have too many intersection, and the reception signal amplitude that the carrier wave RFID signal that the rfid card after the certain distance of the place ahead is sent has of aligning or adjacent array to decline with narrow angle directional antenna in little band secondary array antenna battle array can be higher than threshold value obtains low frequency with demodulation rfid card signal; If the active RFID card is in the very near position of card reader, distance location, other arrays are declined be with narrow angle directional antenna can both read this card signal, this distance can belong in the positioning error distance range.
Described card reader inside, directional antenna battle array active RFID location, the narrow angle of little band secondary array based on directional antenna battle array location also has one and measures based on the narrow angle of the little band secondary array directional antenna battle array active RFID location card reader setting angle of directional antenna battle array location and angle and the height sensor of height and position; Described angle is connected with described Card Reader treating apparatus signal with height sensor.
The described narrow angle of little band secondary array directional antenna battle array active RFID based on directional antenna battle array location is located the artificial input port that card reader inside also has the angle of pitch, level angle and height and position, and the artificial input port of the described angle of pitch, level angle and height and position is connected with described Card Reader treating apparatus signal.When mounted, survey angle, the altitude information of locating card reader down based on the narrow angle of the little band secondary array directional antenna battle array active RFID of directional antenna battle array location, manually be input in the Card Reader treating apparatus, when location Calculation, use.
The receiving chip that described band detects has a low frequency signal output terminal, and this low frequency signal output terminal is received in the gating circuit of Card Reader treating apparatus.When the decline receiving chip that detects with the corresponding band of narrow angle directional antenna of some arrays is read the rfid card signal and just opened gating circuit, send into safety demonstration and the reading of the information of carrying out in the Card Reader treating apparatus, and decline with angle, this array according to self coordinate position of Card Reader treating apparatus storage and to carry out COMPREHENSIVE CALCULATING and probabilistic determination with the parameters such as signal amplitude grade of narrow angle directional antenna institute's azimuthal and reception, with calculate this be stuck in this array decline be in the space multistory angle with narrow angle directional antenna time on where locate the position; Further, if being arranged, two or four little narrow angle directional antennas of being with of array can both receive same rfid card signal, just can judge that based on directional antenna battle array active RFID location, the narrow angle of the little band secondary array card reader of directional antenna battle array location rfid card is on which edge or angle at narrow space multistory angle so, carry out the position segmentation; And, because rfid card all is on the level ground certain highly in the interval, can be according to the segmentation angle of Card Reader and the highly more accurate position of calculating based on directional antenna battle array active RFID location, the narrow angle of the little band secondary array card reader of directional antenna battle array location.
Described array declines and preferentially selects 2.4GHz or 5.8GHz for use with the superfrequency frequency of narrow angle directional antenna employing.Adopted the carrier frequency of superfrequencies such as comprising 2.4GHz and 5.8GHz to reduce electromagnetic wave diffraction and fluctuation, also reduced antenna size, in the position judgment of this location card reader, can get rid of because human body and indoor article transmit influence to electromagnetic wave signal than aforesaid other localization methods and cause big location interference, improve bearing accuracy.
Described directional antenna battle array active RFID location, the narrow angle of little band secondary array card reader based on directional antenna battle array location also has a network chip processor and a network processes interface, described network chip processor and described Card Reader treating apparatus communicate to connect, and also communicate to connect between described network chip processor and the network processes interface.Based on directional antenna battle array active RFID location, the narrow angle of the little band secondary array card reader of directional antenna battle array location the rfid card information read and the position data of calculating are sent to central server and database by network interface from network like this, realizing the location Card Reader of active RFID system.
Described directional antenna battle array active RFID location, the narrow angle of little band secondary array card reader based on directional antenna battle array location also has the card of writing circuit and wide-angle antenna, and the described card circuit of writing is connected with the wide-angle aerial signal.Write card information by the emission wide-angle, can carry out write operation to the rfid card in the Card Reader scope, just can realize active RFID locating read-write card device.
This directional antenna battle array active RFID location, the narrow angle of little band secondary array card reader based on directional antenna battle array location of the present invention, adopt the little band secondary of superfrequency array antenna battle array to reach narrow angle and point to reception, read the active RFID card information with embedded computer control and calculate and determine the coordinate position that blocks by being receiving chip that little band secondary array antenna that the space multistory angle distributes in length and breadth and corresponding band detect, and have the position data that network interface will comprise rfid card information and card and send to system server and database through network.It is useful in the space of certain limit to sticking into row location Card Reader with the active RFID that upper frequency compresses transmission information with moderate emissive power and UHF carrier, can determine necessarily orientation and the correspondence position of the interior rfid card in zone with this single card reader, locate card reader networking intersection Card Reader more than two and can more accurately determine active rfid card position or expand the scope of locating Card Reader.This design is unique novel, has solved active RFID location and the Card Reader in indoor or outdoors space, and locator meams is subjected to factor affecting such as environment little, and bearing accuracy is improved, and the card reader networking of a plurality of location can enlarge the accuracy of Card Reader zone and location.Present technique is suitable for the location of many occasions such as market, meeting room, airport lounge, plant area, harbour, realizes purpose of the present invention.
Characteristics of the present invention can be consulted the detailed description of the graphic and following better embodiment of this case and be obtained to be well understood to.
Description of drawings
Fig. 1 is for of the present invention a kind of based on directional antenna battle array active RFID location, the narrow angle of the little band secondary array card reader of antenna array scanning location and the system schematic of the rfid card that is positioned.
Fig. 2 is a kind of directional antenna battle array active RFID location, the narrow angle of little band secondary array card reader inner structure synoptic diagram based on antenna array scanning location of the present invention;
Fig. 3 is the distribution schematic diagram of microstrip antenna unit on dielectric-slab that a kind of narrow angle of little band secondary array directional antenna battle array active RFID based on antenna array scanning location of the present invention is located card reader.
Embodiment
For technological means, creation characteristic that the present invention is realized, reach purpose and effect is easy to understand, below in conjunction with concrete diagram, further set forth the present invention.
As shown in Figure 1, provided the employed system environments of the narrow angle of little band secondary array directional antenna battle array active RFID location card reader based on antenna array scanning location of the present invention among the figure, it is by the narrow angle of little band secondary array directional antenna battle array active RFID location card reader 100, use to as if the active RFID card 200 of the people that walks about or the low speed mobile object UHF carrier high-frequency compression transmission information of carrying, and the server of rfid system network 300 and rfid system and database 400 compositions.
Referring to Fig. 2, directional antenna battle array active RFID location, the narrow angle of little band secondary array card reader 100 comprises the shell 180 of a band PVC receive window and can regulate fixed support 190, shell 180 is installed in can be regulated on the fixed support 190, be provided with the circuit board 160 of RFID Card Reader treating apparatus 150, band angle and the height sensor of antenna 130a, band embedded computer 155 and network chip processor 158 in the shell 180, also be provided with power interface 170 and network processes interface 175 on the shell 180 more in addition.Network chip processor 158 communicates to connect with embedded computer 155, also communicates to connect between network chip processor 158 and the network processes interface 175.Embedded computer 155 sends to central server and database 400 by network chip processor 158 and network interface 175 from grid 300 with active RFID card 200 information read and the position data of calculating, realizes the location Card Reader of active RFID system.
Several arrays decline and position Card Reader with the narrow angle directional antenna 1 10 responsible signals that receive the active RFID card 200 of the UHF carrier high-frequency compression transmission information of being carried by the people who walks about or low speed mobile object.
Several arrays decline, and to be Card Reader angular ranges of requiring according to card reader by the space multistory angle differ is slightly less than this Card Reader angle to be the fan profile arranged evenly with narrow angle directional antenna 110, reach total Card Reader angular range that directional antenna battle array active RFID location, the narrow angle of little band secondary array card reader requires, each array is declined with each orientation in narrow angle directional antenna 110 seamless responsible Card Reader spaces.Certainly several arrays that should directional antenna battle array active RFID location, the narrow angle of little band secondary array card reader decline and are with the narrow angle directional antenna 110 also can be arranged evenly accordingly by other, reach total Card Reader angular range of directional antenna battle array active RFID location, the narrow angle of little band secondary array card reader requirement.If array declines more narrow with the angle of narrow angle directional antenna 110, the array number of whole little band secondary array antenna battle array 130 will be more many, and bearing accuracy is also higher, and antenna area can be bigger.
As shown in Figure 3, each array declines and is with narrow angle directional antenna 110 to take advantage of dozens of small-sized microstrip antenna unit 101 equidistantly to be arranged in length and breadth on the dielectric-slab 103 by λ/4 by dozens of to form, the gold-plated microstrip antenna of microstrip antenna unit's 101 miniaturizations.Array declines and is determined by bearing accuracy with first 101 numbers of the microstrip antenna of the array of narrow angle directional antenna 110, the microstrip antenna unit 101 of array is more many, array declines just more narrow with the main lobe receiving angle of narrow angle directional antenna 110, and the more for a short time zone that makes short distance reception be regardless of direction of secondary lobe is more few, and bearing accuracy is corresponding improve all.But the microstrip antenna unit 101 according to the Frequency Design that receives can reach the electromagnetic high-gain reception of communication frequency that array is declined and makes progress with narrow angle directional antenna 110 narrow corner connection debits, and the space electromagnetic wave outside the narrow angle is received the nothing gain, obtain to determine that the sensing at the narrow space multistory of angle angle receives.
Continuation is referring to Fig. 2, each array declines has a corresponding band to detect the receiving chip 120 of CPU with narrow angle directional antenna 110, by feeder line the signal that receives in each microstrip antenna unit 101 is all delivered to the receiving chip 120 that band detects CPU and carry out the mixing demodulation, the receiving chip 120 of this band detection CPU receives detection the peak-to-peak value of carrier wave RFID signal of each microstrip antenna unit and weighting effective value as signal amplitude.
Band detects the carrier signal amplitude input threshold value of the mixing demodulation of receiving chip 120 settings of CPU, by setting the carrier wave RFID signal amplitude input threshold value of a mixing demodulation, noise signals such as the deamplification that deadening penetrates into from wall and mirror image interference, to improve accuracy and signal to noise ratio (S/N ratio), reach definite receptivity.
The receiving chip 120 of band detection CPU is by carrier signal amplitude input threshold value and definite threshold size of a mixing demodulation of setting in addition, the edge at each the narrow space multistory angle that array is declined receive with narrow angle directional antenna 110 connects but does not have too many intersection, and the reception signal amplitude that the carrier wave RFID signal that the rfid card after the certain distance of the place ahead is sent has of aligning or adjacent array to decline with narrow angle directional antenna 110 in little band secondary array antenna battle array 130 can be higher than threshold value obtains low frequency with demodulation rfid card signal; Nearly distance R FID card 200 declines at non-conterminous array and the distance of the distance of induction and remote positioning error occurs as bearing accuracy with narrow angle directional antenna 110.
The receiving chip 120 that band detects has a low frequency signal output terminal, and this low frequency signal output terminal is received in the gating circuit 152 of RFID Card Reader treating apparatus 150 by signal wire 125.When the decline receiving chip 120 that detects with the corresponding band of narrow angle directional antenna 110 of some arrays is read the rfid card signal and just opened gating circuit 152, send into safety demonstration and the reading of the information of carrying out in the embedded computer 155, and decline with angle, this array according to self coordinate position of embedded computer 155 storage and to carry out COMPREHENSIVE CALCULATING and probabilistic determination with the parameters such as signal amplitude grade of 110 azimuthal of narrow angle directional antenna and reception, with calculate this be stuck in be in the little space multistory angle with narrow angle directional antenna 110 of this array time on where locate the position.
If being arranged, two or four little narrow angle directional antennas 110 of being with of array can both receive same rfid card signal, just can judge that based on directional antenna battle array active RFID location, the narrow angle of the little band secondary array card reader of directional antenna battle array location rfid card is on which edge or angle at narrow space multistory angle so, carry out the position segmentation; And, because rfid card all is on the level ground certain highly in the interval, can be according to the segmentation angle of Card Reader and the highly more accurate position of calculating based on directional antenna battle array active RFID location, the narrow angle of the little band secondary array card reader of directional antenna battle array location.
Directional antenna battle array active RFID location, the narrow angle of little band secondary array card reader 100 declines at array and has comprised the carrier frequency of superfrequencies such as 2.4GHz and 5.8GHz with 110 designs of narrow angle directional antenna, makes electromagnetic wave diffraction, mirror image interference, other interference sources and indoor object and people's interference less to the location influence by above enforcement.
In the application of present embodiment, if the narrow angle of little band secondary array directional antenna battle array active RFID location card reader 100 need have the card of writing function, only need to increase by one in this location card reader and write card circuit and wide-angle antenna, the emission wide-angle is write card information and can be carried out write operation to the rfid card 200 in the Card Reader scope, just can realize the locating read-write card device of active RFID.
More than show and described ultimate principle of the present invention and principal character and advantage of the present invention.The technician of the industry should understand; the present invention is not restricted to the described embodiments; that describes in above-described embodiment and the instructions just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.The claimed scope of the present invention is defined by appending claims and equivalent thereof.
Claims (14)
1. the narrow angle of the little band secondary array directional antenna battle array active RFID based on directional antenna battle array location is located card reader, comprise antenna and Card Reader treating apparatus, described antenna is connected with Card Reader treating apparatus signal, it is characterized in that described antenna is a little band secondary array antenna battle array that distributes in this card reader space, directional antenna battle array active RFID location, narrow angle of little band secondary array receiving angle.
2. the narrow angle of the little band secondary array directional antenna battle array active RFID based on directional antenna battle array location as claimed in claim 1 is located card reader, it is characterized in that, described little band secondary array antenna battle array is divided into several little little narrow angle directional antennas of being with narrow solid angle, and several little little active RFID card signals of being responsible for receiving the UHF carrier high-frequency compression transmission information of being carried by the people who walks about or low speed mobile object with narrow angle directional antenna with narrow solid angle position Card Reader.
3. the narrow angle of the little band secondary array directional antenna battle array active RFID based on directional antenna battle array location as claimed in claim 2 is located card reader, it is characterized in that, describedly littlely be with narrow angle directional antenna with narrow angle directional antenna for the array according to the frequency range design that receives declines with the little of narrow solid angle.
4. the narrow angle of the little band secondary array directional antenna battle array active RFID based on directional antenna battle array location as claimed in claim 3 is located card reader, it is characterized in that, it is arranged evenly by space multistory angle fan profile according to the Card Reader angular range of card reader requirement that described several arrays decline with narrow angle directional antenna, and each several arrays are declined with each orientation in the seamless responsible Card Reader of directional antenna space, narrow angle.
5. as claim 3 or 4 described directional antenna battle array active RFID location, the narrow angle of little band secondary array card reader based on directional antenna battle array location, it is characterized in that, each several array decline be with narrow angle directional antenna by dozens of take advantage of dozens of microstrip antenna unit in accordance with regulations spacing in length and breadth compact arrangement form.
6. the narrow angle of the little band secondary array directional antenna battle array active RFID based on directional antenna battle array location as claimed in claim 5 is located card reader, it is characterized in that press λ/4 spacings compactness arranged evenly on dielectric-slab for the gold-plated microstrip antenna of miniaturization in described microstrip antenna unit.
7. the narrow angle of the little band secondary array directional antenna battle array active RFID based on directional antenna battle array location as claimed in claim 6 is located card reader, it is characterized in that, each array declines the carrier wave RFID signal that receives in each microstrip antenna unit all to be delivered to the little receiving chip that detects with the corresponding band of narrow angle directional antenna of this array by feeder line with narrow angle directional antenna and carries out the mixing demodulation, and the receiving chip of this band detection receives detection the peak-to-peak value of carrier wave RFID signal of each microstrip antenna unit and weighting effective value as signal amplitude.
8. directional antenna battle array active RFID location, the narrow angle of the little band secondary array card reader based on directional antenna battle array location as claimed in claim 7 is characterized in that the receiving chip that described band detects is set the carrier wave RFID signal amplitude input threshold value of a mixing demodulation.
9. the narrow angle of the little band secondary array directional antenna battle array active RFID based on directional antenna battle array location as claimed in claim 8 is located card reader, it is characterized in that described card reader inside, directional antenna battle array active RFID location, the narrow angle of little band secondary array based on directional antenna battle array location also has one and measures based on the narrow angle of the little band secondary array directional antenna battle array active RFID location card reader setting angle of directional antenna battle array location and angle and the height sensor of height and position; Described angle is connected with described Card Reader treating apparatus signal with height sensor.
10. the narrow angle of the little band secondary array directional antenna battle array active RFID based on directional antenna battle array location as claimed in claim 8 is located card reader, it is characterized in that, the described narrow angle of little band secondary array directional antenna battle array active RFID based on directional antenna battle array location is located the artificial input port that card reader inside also has the angle of pitch, level angle and height and position, and the artificial input port of the described angle of pitch, level angle and height and position is connected with described Card Reader treating apparatus signal; When mounted, survey angle, the altitude information of locating card reader down based on the narrow angle of the little band secondary array directional antenna battle array active RFID of directional antenna battle array location, manually be input in the Card Reader treating apparatus, when location Calculation, use.
11. directional antenna battle array active RFID location, the narrow angle of the little band secondary array card reader based on directional antenna battle array location as claimed in claim 8, it is characterized in that, the receiving chip that described band detects has a low frequency signal output terminal, and this low frequency signal output terminal is received in the gating circuit of Card Reader treating apparatus; When the decline receiving chip that detects with the corresponding band of narrow angle directional antenna of some arrays is read the rfid card signal and just opened gating circuit, send into safety demonstration and the reading of the information of carrying out in the Card Reader treating apparatus, and decline with angle, this array according to self coordinate position of Card Reader treating apparatus storage and to carry out COMPREHENSIVE CALCULATING and probabilistic determination with the parameters such as signal amplitude grade of narrow angle directional antenna institute's azimuthal and reception, with calculate this be stuck in this array decline be in the space multistory angle with narrow angle directional antenna time on where locate the position; Further, if being arranged, two or four little narrow angle directional antennas of being with of array can both receive same rfid card signal, just can judge that based on directional antenna battle array active RFID location, the narrow angle of the little band secondary array card reader of directional antenna battle array location rfid card is on which edge or angle at narrow space multistory angle so, carry out the position segmentation; And, because rfid card all is on the level ground certain highly in the interval, can be according to the segmentation angle of Card Reader and the highly more accurate position of calculating based on directional antenna battle array active RFID location, the narrow angle of the little band secondary array card reader of directional antenna battle array location.
12. directional antenna battle array active RFID location, the narrow angle of the little band secondary array card reader based on directional antenna battle array location as claimed in claim 8, it is characterized in that described array declines and preferentially selects 2.4GHz or 5.8GHz for use with the superfrequency frequency of narrow angle directional antenna employing.
13. directional antenna battle array active RFID location, the narrow angle of the little band secondary array card reader based on directional antenna battle array location as claimed in claim 8, it is characterized in that, described directional antenna battle array active RFID location, the narrow angle of little band secondary array card reader based on directional antenna battle array location also has a network chip processor and a network processes interface, described network chip processor and described Card Reader treating apparatus communicate to connect, and also communicate to connect between described network chip processor and the network processes interface.
14. directional antenna battle array active RFID location, the narrow angle of the little band secondary array card reader based on directional antenna battle array location as claimed in claim 8, it is characterized in that, described directional antenna battle array active RFID location, the narrow angle of little band secondary array card reader based on directional antenna battle array location also has the card of writing circuit and wide-angle antenna, and the described card circuit of writing is connected with the wide-angle aerial signal.
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| CN201210100637.9A CN103198284B (en) | 2012-04-09 | 2012-04-09 | A kind of active RFID locating card reader based on microstrip array directional antenna battle array location |
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| CN201210100637.9A CN103198284B (en) | 2012-04-09 | 2012-04-09 | A kind of active RFID locating card reader based on microstrip array directional antenna battle array location |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103745243A (en) * | 2014-01-14 | 2014-04-23 | 公安部第三研究所 | Oblique placing and pickup facilitation device for radio frequency identification reader-writer |
| CN103745244A (en) * | 2014-01-14 | 2014-04-23 | 公安部第三研究所 | RFID (Radio Frequency Identification) reader-writer with arc-shaped card reading surface |
| CN109216887A (en) * | 2017-06-30 | 2019-01-15 | 群创光电股份有限公司 | Liquid crystal antenna assembly |
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| CN103745243A (en) * | 2014-01-14 | 2014-04-23 | 公安部第三研究所 | Oblique placing and pickup facilitation device for radio frequency identification reader-writer |
| CN103745244A (en) * | 2014-01-14 | 2014-04-23 | 公安部第三研究所 | RFID (Radio Frequency Identification) reader-writer with arc-shaped card reading surface |
| CN103745243B (en) * | 2014-01-14 | 2016-11-16 | 公安部第三研究所 | Tilting easy fetching for radio-frequency identification reader/writer is put |
| CN103745244B (en) * | 2014-01-14 | 2017-03-08 | 公安部第三研究所 | There is the radio-frequency identification reader/writer on arc Card Reader surface |
| CN109216887A (en) * | 2017-06-30 | 2019-01-15 | 群创光电股份有限公司 | Liquid crystal antenna assembly |
| US10811769B2 (en) | 2017-06-30 | 2020-10-20 | Innolux Corporation | Liquid-crystal antenna apparatus and method for tracking wireless apparatus using the same |
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|---|---|
| CN103198284B (en) | 2016-03-30 |
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