CN101350750B - Analog/digital mixed wireless sensor network - Google Patents
Analog/digital mixed wireless sensor network Download PDFInfo
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- CN101350750B CN101350750B CN2008101194282A CN200810119428A CN101350750B CN 101350750 B CN101350750 B CN 101350750B CN 2008101194282 A CN2008101194282 A CN 2008101194282A CN 200810119428 A CN200810119428 A CN 200810119428A CN 101350750 B CN101350750 B CN 101350750B
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Abstract
The present invention provides an analog/digital hybrid wireless image sensor network, and belongs to the photovoltaic technical field. The network consists of an ordinary node, a convergent node and a central receiver/controller; wherein, the ordinary node consists of an image sensor module, a processor module, a wireless analog video transmission module, a wireless digital communication module and a power supply module; the convergent node consists of a wireless simulation video relay module, a wireless digital communication module, a processor module and a power supply module; the central receiver/controller comprises a wireless simulation video receiving module, a wireless digital communication module, a microcomputer and so on. The analog/digital hybrid wireless image sensor network adopts such methods as the integration of the analog type wireless transmission module in the ordinary node, and realizes the real-time wireless transmission of the output video signals of the image sensor under the premise with the basic functions of the WSN.
Description
Technical field
The present invention is a kind of analog/digital mixed wireless sensor network with real-time radio video transmission capabilities, belongs to field of photoelectric technology.
Background technology
At military affairs and civil area, have following typical technical need: (1) needs to obtain the vision signal of monitored area in real time by imageing sensor in order to obtain the comprehensive information of regional area.For example:, can in the very first time, determine the type and the state of target by video image when the monitored area suspicious object occurs or accident has taken place; (2) need the detection information of being exported of other transducer (sound, vibration, chemical sensor etc.) is transferred to centralized control unit by wireless mode.For example: by obtaining the acoustic information of target, to determine the running status of target; (3) centralized control unit needs by wireless mode the Control Parameter of each transducer of comprising imageing sensor to be carried out real-time configuration, so that according to the variation of environment, obtain desirable detection information.For example: parameters such as the time of integration by real-time configuration image transducer, gain, BLC obtain best picture quality etc.; (4) in order to reduce cost and to be easy to configuration, each module in the system should realize microminaturization.
The subject matter that satisfies the required solution of above technical need is: under the prerequisite that guarantees the short-distance wireless digital communication, realize low cost, microminaturization, the real-time radio transmission of imageing sensor outputting video signal.At present, realize that the Wireless transmission mode of vision signal mainly contains two kinds, that is: digital form and analog form.Wherein, digital form is by A/D converter vision signal to be converted to digital video, then modulates, wireless transmission.Because digital video signal self has the higher data rate, therefore, the real-time Transmission that realizes vision signal based on digital form has higher requirement for the data transfer rate of wireless digital module.With the 10bit digital video is example, and the data transfer rate of VGA (640 * 480) signal is 3.1Mbps, and the data transfer rate of SVGA (800 * 600) signal is 4.8Mbps, and the data transfer rate of XGA (1024 * 768) signal is 7.9Mbps.Therefore, if realize the wireless transmission of digital video, the data transfer rate of radio digital communication module generally should be greater than 5Mbps.On the other hand, though can reduce data transfer rate to a certain extent by the Image Data Compression technology, image compression circuit will increase the volume and the cost of system, and the part compression algorithm will make image quality decrease; Comparatively speaking, analog form then directly carries out high frequency modulated to analog video signal, thereby need not to consider the data transfer rate problem, can realize the real-time radio transmission of vision signal.
The short-distance wireless digital communication technology is the major technique means of radio digital communication in the local scope.Main short-distance wireless digital communication technology comprises at present: bluetooth (blue tooth), Wi-Fi, IrDA, UWB, ZigBee etc.
Bluetooth technology is mainly used in the wireless connections between communication and the information equipment by the common release in 1998 of companies such as Ericsson, Nokia, IBM.The operating frequency of bluetooth module is 2.4GHz, the about 10m of effective range, and it is embodied as relatively low.As a kind of cable replacement technology, applying Bluetooth can be interconnected computer, mobile phone and multiple portable mobile terminal, so that voice and digital access service to be provided, realizes the automatic exchange and the processing of information.Because data transfer rate lower (1Mbps), Bluetooth technology are difficult to satisfy the requirement of high-speed video transmission.Simultaneously, its communication distance only has 10m, has also limited its application to a certain extent.
Wi-Fi (Wireless Fidelity) is a kind of wireless communication protocol, and its formal name is called IEEE802.11b.The operating frequency of Wi-Fi is 2.4GHz, and effective range is about 100m, and its speed reaches as high as 11Mb/s.Wi-Fi is a kind of wireless extensions of Ethernet, in theory as long as the user is positioned at the certain zone around the access point, and just can be with the speed access network of the highest 11Mb/s.Wi-Fi module subject matter is that its price is relatively costly, is difficult to satisfy requirement of system design cheaply.Simultaneously, it still awaits further raising at communication distance, aspect compatible.
IrDA (Infrared Data Association) is a kind of technology of utilizing infrared ray to carry out point-to-point communication.The major advantage of IrDA is the right to use that need not demand frequency, and communications cost is cheap relatively.In addition, IrDA also has the characteristics that the required volume of mobile communication is little, low in energy consumption, easy to connect, be simple and easy to usefulness.Owing to data transmission rate higher (16Mb/s), be suitable for the file and the multi-medium data of transmission of large capacity.The main deficiency of IrDA is that it is a kind of line-of-sight transmission, promptly must aim between two equipment that intercom mutually, and the centre can not be intercepted by other object, thereby this technology can only be used for two connections between the equipment.Therefore, though IrDA can satisfy the requirement of the data transfer rate of digital video transmission within the specific limits, its application is restricted.
Super-broadband tech (UWB, Ultra Wideband) mainly sends data by the mode that base band pulse acts on antenna.UWB works in the 3.1-10.6GHz frequency range, is mainly used among a small circle, in high-resolution radar and the picture system.UWB can support the data transmission rate up to 110Mb/s, can realize the high-speed radio transmission of digital video signal.The subject matter of UWB technology is its working range limited (less than 10m), is difficult to satisfy the application demand in most of field.This technology is mainly used in the video entertainment field at present.
Zigbee is the short-distance wireless digital communication technology of a kind of low-power consumption, low cost, low rate.The physical layer of Zigbee, MAC layer and link layer have adopted the IEEE802.15.4 consensus standard, and its network layer, application convergence layer and higher layer applications standard are formulated by Zigbee alliance.Zigbee is a support with working node independently, forms starlike, sheet or mesh network by radio digital communication.The Zigbee system is made of child node (being called " simplifying function device ") and aggregation node (being called " full-function device ", " telegon ").Wherein, aggregation node mainly is responsible for communicating by letter with the child node of being controlled, aggregated data and issue control and the route etc. of communicating by letter.Zigbee have low-power consumption, low cost, low rate (20-250kbps), closely (10-100m), prolong in short-term (＜30ms), advantage such as high power capacity (maximum 65000 nodes), high security.At present, in the wireless network that Zigbee is mainly used in constituting apart from various electronic equipments short, low in energy consumption and that transmission rate is not high.Because its maximum data rate only has 250kbps, therefore be difficult to satisfy the requirement of high-speed video transmission.
In sum, present existing short-distance wireless digital communication technology is difficult to satisfy the wireless video signal transmission requirement in low cost, two-forty, the local scope.
Summary of the invention
Technical problem solved by the invention is to propose a kind of analog/digital mixed wireless sensor network, can be under the control of related protocol, and the analog video signal real-time Transmission that imageing sensor is gathered is to central controlling receiver; Have the short-distance wireless digital communicating ability, and possess the due basic function of wireless sensor network; Each node in the system can be realized microminaturization, and is applicable to obtaining and transmitting of video image under the varying environment and other information, is with a wide range of applications in fields such as area monitoring, target following, environmental monitorings.
This analog/digital mixed wireless sensor network is made of ordinary node, aggregation node, central authorities' reception/controller; Wherein, ordinary node is made of image sensor module, processor module, wireless simulation video transmission module, radio digital communication module, energy supply module; Aggregation node is made of wireless simulation video trunk module, radio digital communication module, processor module, energy supply module; Central authorities' reception/controller is made of wireless simulation video reception module, radio digital communication module, microcomputer etc.
When analog wireless video transmission mode, the processor module output triggering signal of ordinary node is to image sensor module, image sensor module starts and gathers analog video signal, then the analog video signal that collects is exported to wireless simulation video transmission module; Wireless simulation video transmission module is carried out high frequency modulated, amplification to analog video signal, and to aerial radiation, the energy supply module provides ordinary node work required power supply therebetween; Processor module in the aggregation node outputs control signals to wireless simulation video trunk module, wireless simulation video trunk module starts, and reception analog video signal, signal is carried out after the power amplification once more to aerial radiation, during the energy supply module provide aggregation node work required power supply; The interior wireless simulation video reception module of central authorities' receptions/controller receives vision signal, reverts to raw video signal after demodulation, and inputs to microcomputer and show output.
When the digital radio communication pattern, RFDC module in the ordinary node is carried out high frequency modulated with the digital detection signal of other transducer (sound, vibration, chemical sensor etc.) output, and after power amplification to aerial radiation, during the energy supply module provide ordinary node work required power supply; By node, aggregation node and central authorities' control/receiver radio digital communication module separately, form the transmission path of source node, and make digital detection signal be forwarded to central authorities' reception/controller along transmission path to central authorities' reception/controller.Central authorities' reception/controller is configured by the Control Parameter to transducer, obtains detection information.
Analog/digital mixed wireless sensor network has two kinds of mode of operations, that is: during image signal transmission by analog wireless video transmission mode, when sound, vibration, chemical signal transmission by the digital radio communication pattern.
The invention has the beneficial effects as follows:
1, real-time radio video transmission capabilities.Be subjected to the restriction of short-distance wireless digital communications data rate, present existing wireless sensor network (WSN) does not generally possess the real-time video transmission ability, thereby has reduced the ageing of detection information.The present invention under the prerequisite that possesses the WSN basic function, has realized the real-time radio transmission of imageing sensor outputting video signal by methods such as integrated analog wireless transmitter modules in ordinary node;
2, adaptive capacity to environment.Under the control of Routing Protocol, set up the transmission path of central authorities' reception/controller to each node by the digital radio communication module.According to the variation of environment, can be to the parameter configuration of carrying out of each transducer of comprising imageing sensor, obtaining desirable detection information, thereby make wireless sensor network possess adaptive capacity to varying environment.
Description of drawings
Fig. 1 is a system block diagram of the present invention.Wherein: 1-ordinary node, 2-aggregation node, 3-central authorities reception/controller.
Fig. 2 is an ordinary node schematic diagram of the present invention, wherein: 1-1-image sensor module, other transducer of 1-2-(sound, vibration, chemical sensor etc.), the 1-3-processor module, 1-4-wireless video transmitter module, 1-5-radio digital communication module, 1-6-energy supply module.
Fig. 3 is an aggregation node schematic diagram of the present invention, wherein: 2-1-wireless video trunk module, 2-2-radio digital communication module, 2-3-processor module, 2-4-energy supply module.
Fig. 4 is the reception/controller principle figure of central authorities of the present invention, wherein: 3-1-wireless simulation video reception module, 3-2-radio digital communication module, 3-3-microcomputer.
Embodiment
Analog/digital mixed wireless sensor network exists analog wireless video transmission mode, two kinds of mode of operations of digital radio communication pattern, and two kinds of patterns can be worked individually or simultaneously.
The embodiment of analog wireless video transmission mode is as follows:
The first step: in ordinary node 1, image sensor module 1-1 gathers analog video signal, under the control of processor module 1-3, after wireless video transmitter module 1-4 carries out high frequency modulated to aerial radiation.
Second the step: in aggregation node 2, under the control of processor module 2-3, wireless simulation video trunk module 2-1 receives the wireless simulation video after the high frequency modulated, after power amplification once more to aerial radiation.
The 3rd step: in central authorities' reception/controller 3, wireless simulation video reception module 3-1 receives the analog video signal of high frequency modulated, reverts to raw video signal after demodulation, then inputs to microcomputer 3-3 and shows output.
The embodiment of digital radio communication pattern is as follows:
The first step: in ordinary node 1, the digital detection signal of other transducer (sound, vibration, chemical sensor etc.) 1-2 output, under the control of processor module 1-3, after radio digital communication module 1-5 carries out high frequency modulated to aerial radiation.
Second step: under the control of Routing Protocol, network forms the transmission path of source node to aggregation node automatically.Digital detection signal after the high frequency modulated transmits through this path, and is received by the radio digital communication module 2-2 in the aggregation node 2.Radio digital communication module 2-2 the digital detection signal that receives is handled and power amplification after once more to aerial radiation.
The 3rd step: in central authorities' reception/controller 3, radio digital communication module 3-2 receives the high-frequency digital detectable signal of aggregation node emission, reverts to raw digital signal after demodulation, then inputs to microcomputer 3-3 and shows output.
The 4th step: according to the variation of the environment and the demand of detection, central authorities' reception/controller can be by the inverse process of above method, utilize the radio digital communication passage that the Control Parameter of image sensor module 1-1, other transducer (sound, vibration, chemical sensor etc.) 1-2 is configured, to obtain desirable detection information.
Claims (1)
1. the analog/digital mixed wireless image sensor network is made of ordinary node, aggregation node, central authorities' reception/controller; Wherein, ordinary node is made of image sensor module, processor module, wireless simulation video transmission module, radio digital communication module, energy supply module; Aggregation node is made of wireless simulation video trunk module, radio digital communication module, processor module, energy supply module; Central authorities' reception/controller is made of wireless simulation video reception module, radio digital communication module, microcomputer etc.; It is characterized in that:
When analog wireless video transmission mode, the processor module output triggering signal of ordinary node is to image sensor module, image sensor module starts and gathers analog video signal, then the analog video signal that collects is exported to wireless simulation video transmission module; Wireless simulation video transmission module is carried out high frequency modulated, amplification to analog video signal, and to aerial radiation, the energy supply module provides ordinary node work required power supply therebetween; Processor module in the aggregation node outputs control signals to wireless simulation video trunk module, wireless simulation video trunk module starts, and reception analog video signal, signal is carried out after the power amplification once more to aerial radiation, during the energy supply module provide aggregation node work required power supply; The interior wireless simulation video reception module of central authorities' receptions/controller receives vision signal, reverts to raw video signal after demodulation, and inputs to microcomputer and show output;
When the digital radio communication pattern, RFDC module in the ordinary node is carried out high frequency modulated with the digital detection signal of sound, vibration, chemical sensor output, and after power amplification to aerial radiation, during the energy supply module provide ordinary node work required power supply; By node, aggregation node and central authorities' control/receiver radio digital communication module separately, form the transmission path of source node to central authorities' reception/controller, and make digital detection signal be forwarded to central authorities' reception/controller along transmission path, central authorities' reception/controller is configured by the Control Parameter to transducer, obtains detection information.
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| CN102355725A (en) * | 2011-08-04 | 2012-02-15 | 无锡儒安科技有限公司 | Method for positioning non-interactive wireless image sensor network |
| CN104778843A (en) * | 2014-01-14 | 2015-07-15 | 广州航天海特系统工程有限公司 | Wireless sensor network communication system |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6579231B1 (en) * | 1998-03-27 | 2003-06-17 | Mci Communications Corporation | Personal medical monitoring unit and system |
| CN1949814A (en) * | 2006-11-20 | 2007-04-18 | 清华大学 | Domestic protection environment monitoring warning system based on wireless sensor network |
| CN101009821A (en) * | 2007-01-31 | 2007-08-01 | 北京邮电大学 | Implementing method for the enhanced cost-effective video sensor network coverage |
| CN101058009A (en) * | 2007-05-24 | 2007-10-24 | 公安部上海消防研究所 | Large space blind area of fire hazard detecting system based on ZigBee |
| WO2008069564A1 (en) * | 2006-12-08 | 2008-06-12 | Electronics And Telecommunications Research Institute | Sensor node of wireless sensor networks and operating method thereof |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6579231B1 (en) * | 1998-03-27 | 2003-06-17 | Mci Communications Corporation | Personal medical monitoring unit and system |
| CN1949814A (en) * | 2006-11-20 | 2007-04-18 | 清华大学 | Domestic protection environment monitoring warning system based on wireless sensor network |
| WO2008069564A1 (en) * | 2006-12-08 | 2008-06-12 | Electronics And Telecommunications Research Institute | Sensor node of wireless sensor networks and operating method thereof |
| CN101009821A (en) * | 2007-01-31 | 2007-08-01 | 北京邮电大学 | Implementing method for the enhanced cost-effective video sensor network coverage |
| CN101058009A (en) * | 2007-05-24 | 2007-10-24 | 公安部上海消防研究所 | Large space blind area of fire hazard detecting system based on ZigBee |
Non-Patent Citations (1)
| Title |
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| JP特开20083338A 2008.01.10 |
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