CN203352802U - UWB (Ultra Wide Band) signal location system in wireless sensing network - Google Patents
UWB (Ultra Wide Band) signal location system in wireless sensing network Download PDFInfo
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- CN203352802U CN203352802U CN 201320453423 CN201320453423U CN203352802U CN 203352802 U CN203352802 U CN 203352802U CN 201320453423 CN201320453423 CN 201320453423 CN 201320453423 U CN201320453423 U CN 201320453423U CN 203352802 U CN203352802 U CN 203352802U
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Abstract
The utility model discloses a UWB (Ultra Wide Band) signal location system in a wireless sensing network. The system comprises a wireless sensor node part and a wireless sensing network location network part. The wireless sensor node part is composed of a UWB signal generator, an RFID tag and a wireless communication transmission module, wherein the UWB signal generator is connected with the RFID tag. The wireless sensing network location network part is composed of a wireless communication reception module, a signal frequency modulator, a signal demodulation module, a local reference source signal, a system synchronization module, a ranging signal measuring module, a data memory, a location data processing module and a location information display module. The system utilizes UWB signals to perform accurate location of nodes in the wireless sensor network. The system provided by the utility model overcomes the defect of insufficiency in location precision in the prior art, and has the advantages of low cost, convenient use and high location precision.
Description
Technical field
The utility model relates to the node locating field in wireless sense network, and a kind of wireless sense network UWB signal framing system particularly is provided.
Background technology
Sensor network technology is one of study hotspot of current multidisciplinary cutting edge technology, technique has merged the cutting edge technologies such as wireless senser, embedded type wireless sensing network technology, distributed information processing, in military affairs, medical treatment, all there is extensive use in Public Service Field.Technique is described as 21st century the most influential 21 technology and change one of the ten large technology in the world.Wireless sense network is the network system of the self-organizing of a multi-hop forming by communication, purpose is the object information of perception in perception collaboratively, acquisition and processing network's coverage area, and the information of needs is sent to the observer, but the factor that affects the wireless sense network practical application is a lot, wherein, location technology is exactly one of the restriction main restricting factor of its development and key technology.
Simultaneously, ultra broadband (Ultra Wide Band, UWB) communication technology is the wireless communication technology of a kind of shock pulse with nanosecond high speed transmission data in short distance, a kind of unconventional, novel Radio Transmission Technology, it usually adopt ultra-narrow pulse (pulsewidth in nanosecond to picosecond magnitude) or extremely wide frequency spectrum (relative bandwidth be greater than 20% or absolute bandwidth be greater than 500MHz) transmission information.The characteristics such as this communication technology has good concealment, penetration capacity is strong and low in energy consumption, in the range finding of wireless sensor network, position application, have very important realistic function, may be used in actual material supply track and localization.With respect to traditional sinusoidal wave communication system, the UWB wireless communication system have high transfer rate, high-altitude ask spectrum efficiency, high range accuracy, low probability of intercept, anti-multipath disturb, with existing system frequency spectrum share, low-power consumption, low cost, be easy to the plurality of advantages such as total digitalization.These advantages make Ultra-wideband and wireless sensor network form natural combination, also for the research of wireless sensor network, injected fresh blood, so the research and development of the wireless sensor network based on the UWB technology has in recent years also obtained increasing concern.
In conjunction with characteristics and the application in the wireless sensor network positioning system of UWB signal, be applied to time-based arrival (TOA) localization method and contribute to realize higher range accuracy.Yet technology wireless sense network UWB signal positioned with minimum hardware resource, minimum cost and energy consumption receives much concern in the research and development of wireless sense network.The interference such as multipath, shadow effect usually appear in actual communication environment simultaneously, in the node locating application, how to apply the UWB signal and carry out the key technology that node locating also becomes wireless sensor network.
The utility model content
The utility model, for the deficiencies in the prior art, proposes a kind of positioning precision high, wireless sense network UWB signal framing system with low cost.The utility model can be realized the accurate location of wireless terminal node in wireless sense network, is applicable to various complex environments, is the practical location technology of a kind of high accuracy.
The technical solution of the utility model is:
A kind of wireless sense network UWB signal framing system, described system comprises wireless sensor node part and wireless sense network fixer network part, the wireless sensor node part is comprised of UWB signal generator, RFID label, radio communication transmitter module, and wireless sense network fixer network part is comprised of radio communication receiver module, signal-frequenzer, signal demodulation module, local reference source signal, system synchronization module, ranging information measurement module, data storage, locator data processing module, locating information display module, exact position for positioned radio Sensor Network node, it is characterized in that: the output of described reception of wireless signals module is connected to the input of described signal-frequenzer, the output of signal-frequenzer is connected to the first input end of described signal demodulation module, the output of described system synchronization module is connected to the input of described local reference source signal, the output of local reference source signal is connected to the second input of signal demodulation module, the output of signal demodulation module is connected to the input of described ranging information measurement module, the output of ranging information measurement module is connected to the first input end of described locator data processing module, the output of described data storage is connected to the second input of locator data processing module, the output of locator data processing module is connected to the input of described locating information display module.
In described wireless sense network UWB signal framing system, the wireless sensor node part produces the UWB signal by the UWB signal generator, the characteristics such as sort signal has good concealment, penetration capacity is strong, positioning precision is high and low in energy consumption, and there is the bandwidth of non-constant width, be applied to the TOA localization method and contribute to realize higher range accuracy, utilize this signal characteristic to be applied in the wireless sensing network positioning system realize high-precision node locating.Signal generator produces the UWB signal, in RFID label write signal information, after adding the RFID label information, by the radio communication transmitter module, launches this signal; In wireless sensor network fixer network part, the radio communication receiver module is accepted the signal from the emission of radio communication transmitter module, then passes to signal-frequenzer.The instantaneous frequency that signal-frequenzer makes to be subject to modulation signal changes with the variation of frequency modulating signal, thereby the modulated signal that modulation signal is transformed into be adapted at transmitting in channel also can be improved the noise robustness of system by frequency modulation simultaneously.Send the signal demodulation module to together with the local reference source signal that later signal produces with synchronization module by frequency modulation and carry out demodulation, demodulator adopts the device that recovers former modulation signal a kind of vibration produced from modulation or ripple, the signal of exporting after demodulation sends the ranging information measurement module to, is mainly to utilize the ultra-broadband ranging technology of TOA to carry out processing by the locator data processing module after range determination again.Utilize the TOA technology of mentioning in the ranging information measurement module to be found range, then use multi-dimentional scale calibration technology (Multi-Dimensional Scaling after obtaining range information, MDS) carry out network positions, finally by the locating information display module, show locating information.
Described radio communication receiver module carries out frequency modulation and demodulation to the UWB signal received, then signal after treatment is input to the ranging information measurement module, the MDS technology of described ranging information measurement module application based on the TOA range finding carried out node locating, and its concrete steps are as follows:
The first step: utilize the TOA technology to find range and obtain range information.
Second step: utilize MDS computing node coordinate.
If the network design that known node quantity is N is (as k=2 and k=3 mean the two and three dimensions space) in the k dimension space, the coordinates table of node i is shown x so
i=[x
1, x
2... x
k]
t, establishing N dimension symmetry distance matrix between node is D,
be the square distance of i node to a j node, be shown below:
Suppose that all coordinates are all at initial point, so only need just can from range information, draw coordinate through linear transformation.Matrix B means D Shuan center form, i.e. B=J
ndJ
n.Center matrix J
ndefinition J
n=I
n-ee
t/ n, wherein I
nfor unit matrix, e=(1,1 ... 1).B also can be expressed as: B=XX
tobviously B is symmetrical positive semidefinite matrix, can utilize so singular value decomposition for B=V ∧ V
tform, ∧=(l wherein
1, l
2l
n) be the diagonal matrix of the characteristic value composition of arrangement from big to small, V=[v
1, v
2v
n] be the orthogonal matrix that column vector is characteristic vector.
Front k the characteristic value of getting ∧ forms ∧
k, front k characteristic vector in V forms V
k, B can be expressed as:
can obtain the relative coordinate matrix of node:
The 3rd step: positioning result optimization is divided into three phases:
(1) measure the distance between the paired node in communication radius, utilize shortest path first to draw the shortest path distance, the shortest path distance is for building the distance matrix of MDS;
(2) the typical MDS of matrix application that adjusts the distance, preserve 2 (or 3) maximum characteristic value and characteristic vector and build two dimension (or three-dimensional) relative coordinate figure;
(3) utilize known anchor node coordinate that relative coordinate figure is converted into to absolute coordinate figure.
In (1), the scope of at first selected connected graph and the communication radius of ultra-broadband signal.When the distance of a pair of neighbor node (each other in the communication radius the other side) known (can utilize the TOA range finding to obtain), apply typical shortest path first and calculate shortest path information, add distance matrix.Time complexity is O (n
3), n is number of nodes.
In (2), the resulting distance matrix of previous step is directly applied to MDS and carry out singular value decomposition, consequently a width is known the relative map of each node relative coordinate.
In (3), correlation map is converted by linear transformation (comprise transformation of scale, rotation and reflection), and target is to minimize in the previous step map quadratic sum of error between anchor node actual position and dislocation.Calculate this conversion and need O (m consuming time
2), wherein m is the quantity of anchor node.To this conversion of the relative map application of view picture, need O consuming time (n).
Described location technology is little to the dependence of anchor node number, can be in the situation that the very little location of realizing that precision is higher of anchor node number.Compared with the simple communication information of only utilizing, under identical degree of communication, it is high that positioning precision is wanted.Because the UWB signal has good penetration capacity, can also solve the problem that prior art can't be carried out indoor positioning, reduce volume and the power consumption of node device, improve positioning precision, better meet the needs of radio sensing network.
A kind of wireless sense network UWB signal framing system, for the accurate location of realizing the wireless sense network node, it is characterized in that: radio communication transmitter module (3) and radio communication receiver module (4) adopt the transmitting-receiving instrument of the SN65HVD11QD of TI company, the ranging information measurement module adopts German Innosent transducer, the locator data processing module adopts the CC2430 single chip module of TI company, and the locating information display module adopts the LQ057Q3DC12 of Sharp color screen display screen.
The utility model compared with prior art, have following apparent high-lighting characteristics and remarkable advantage: described system adopts the strong UWB signal of penetration capacity to communicate, improved antijamming capability, can effectively to wireless terminal, position, and have simple in structure, advantage with low cost and positioning precision is high, can make the positioning service of wireless sense network obtain applying more widely.
The accompanying drawing explanation
Fig. 1 is system figure of the present utility model;
The time-domain diagram of the UWB signal that Fig. 2 is the utility model employing.
Embodiment
Below in conjunction with accompanying drawing and preferred embodiment, the utility model is further illustrated:
Referring to Fig. 1, a kind of wireless sense network UWB signal framing system, described system comprises wireless sensor node part and wireless sense network fixer network part, the wireless sensor node part is by UWB signal generator 1, RFID label 2, radio communication transmitter module 3 forms, wireless sense network fixer network part is by radio communication receiver module 4, signal-frequenzer 5, signal demodulation module 6, local reference source signal 7, system synchronization module 8, ranging information measurement module 9, data storage 11, locator data processing module 10, locating information display module 12 forms, described system is for the accurate location to the wireless sense network node, it is characterized in that: the output of described reception of wireless signals module 4 is connected to the input of described signal-frequenzer 5, the output of signal-frequenzer 5 is connected to the first input end of described signal demodulation module 6, the output of described system synchronization module 8 is connected to the input of described local reference source signal 7, the output of local reference source signal 7 is connected to the second input of signal demodulation module 6, the output of signal demodulation module 6 is connected to the input of described ranging information measurement module 9, the output of ranging information measurement module 9 is connected to the first input end of described locator data processing module 10, the output of described data storage 11 is connected to the second input of locator data processing module 10, the output of locator data processing module 10 is connected to the input of described locating information display module 12.
In described wireless sense network UWB signal framing system, the wireless sensor node part produces the UWB signal by UWB signal generator 1, the characteristics such as sort signal has good concealment, penetration capacity is strong, positioning precision is high and low in energy consumption, and there is the bandwidth of non-constant width, be applied to the TOA localization method and contribute to realize higher range accuracy, utilize this signal characteristic to be applied in the wireless sensing network positioning system realize high-precision node locating.Signal generator produces the UWB signal in RFID label 2 write signal information, after adding the RFID label information, by radio communication transmitter module 3, launches this signal; In wireless sensor network fixer network part, the signal that radio communication receiver module 4 is accepted from 3 emissions of radio communication transmitter module, then pass to signal-frequenzer 5, the instantaneous frequency that signal-frequenzer 5 makes to be subject to modulation signal changes with the variation of frequency modulating signal, thereby the modulated signal that modulation signal is transformed into be adapted at transmitting in channel also can be improved the noise robustness of system by frequency modulation simultaneously.The local reference source signal 7 that later Signals & Systems synchronization module 8 produces by frequency modulation sends together signal demodulation module 6 to and carries out demodulation, demodulator adopts the device that recovers former modulation signal a kind of vibration produced from modulation or ripple, the signal of exporting after demodulation sends ranging information measurement module 9 to, is mainly to utilize the ultra-broadband ranging technology of TOA to carry out processing by locator data processing module 11 after range determination again.Utilize the TOA technology of mentioning in ranging information measurement module 9 to be found range, then after obtaining range information, use the MDS-MAP technology to carry out network positions, finally by locating information display module 12, show locating information.
The UWB signal of 4 pairs of receptions of described radio communication receiver module carries out frequency modulation and demodulation, then signal after treatment is input to ranging information measurement module 9, the MDS technology of described ranging information measurement module 9 application based on the TOA range finding carried out node locating, and its concrete steps are as follows:
The first step: utilize the TOA technology to find range and obtain range information.
Second step: utilize MDS computing node coordinate.
If the network design that known node quantity is N is (as k=2 and k=3 mean the two and three dimensions space) in the k dimension space, the coordinates table of node i is shown x so
i=[x
1, x
2... x
k]
t, establishing N dimension symmetry distance matrix between node is D,
be the square distance of i node to a j node, shown in (1):
Suppose that all coordinates are all at initial point, so only need just can from range information, draw coordinate through linear transformation.Matrix B means D Shuan center form, i.e. B=J
ndJ
n.Center matrix J
ndefinition J
n=I
n-ee
t/ n, wherein I
nfor unit matrix, e=(1,1 ... 1).B also can be expressed as: B=XX
tobviously B is symmetrical positive semidefinite matrix, can utilize so singular value decomposition for B=V ∧ V
tform, ∧=(l wherein
1, l
2l
n) be the diagonal matrix of the characteristic value composition of arrangement from big to small, V=[v
1, v
2v
n] be the orthogonal matrix that column vector is characteristic vector.
Front k the characteristic value of getting ∧ forms ∧
k, front k characteristic vector in V forms V
k, B can be expressed as:
can obtain the relative coordinate matrix of node:
The 3rd step: positioning result optimization is divided into three phases:
(1) measure the distance between the paired node in communication radius, utilize shortest path first to draw the shortest path distance, the shortest path distance is for building the distance matrix of MDS;
(2) the typical MDS of matrix application that adjusts the distance, preserve 2 (or 3) maximum characteristic value and characteristic vector and build two dimension (or three-dimensional) relative coordinate figure;
(3) utilize known anchor node coordinate that relative coordinate figure is converted into to absolute coordinate figure.
In (1), the scope of at first selected connected graph and the communication radius of ultra-broadband signal.When the distance of a pair of neighbor node (each other in the communication radius the other side) known (can utilize the TOA range finding to obtain), apply typical shortest path first and calculate shortest path information, add distance matrix.Time complexity is O (n
3), n is number of nodes.
In (2), the resulting distance matrix of previous step is directly applied to MDS and carry out singular value decomposition, consequently a width is known the relative map of each node relative coordinate.
In (3), correlation map is converted by linear transformation (comprise transformation of scale, rotation and reflection), and target is to minimize in the previous step map quadratic sum of error between anchor node actual position and dislocation.Calculate this conversion and need O (m consuming time
2), wherein m is the quantity of anchor node.To this conversion of the relative map application of view picture, need O consuming time (n).
Described location technology is little to the dependence of anchor node number, can be in the situation that the very little location of realizing that precision is higher of anchor node number.Compared with the simple communication information of only utilizing, under identical degree of communication, it is high that positioning precision is wanted.Because the UWB signal has good penetration capacity, can also solve the problem that prior art can't be carried out indoor positioning, reduce volume and the power consumption of node device, improve positioning precision, better meet the needs of radio sensing network.
Described locating information display screen is changed and is shown the information of location Calculation module input, and final, the location coordinate information of wireless terminal shows intuitively.
A kind of wireless sense network UWB signal framing system, it is characterized in that: radio communication transmitter module (3) and radio communication receiver module (4) adopt the transmitting-receiving instrument of the SN65HVD11QD of TI company, ranging information measurement module (9) adopts German Innosent transducer, locator data processing module (10) adopts the CC2430 single chip module of TI company, and locating information display module (12) adopts the LQ057Q3DC12 of Sharp color screen display screen.
Referring to Fig. 2, the time-domain diagram of the UWB signal adopted for the utility model, the time domain pulse period was 2 nanoseconds, amplitude normalization.
In sum, the utility model is simple in structure, is applicable to various localizing environments, has advantages of that cost is low, energy consumption low and positioning precision is quite high, can make the positioning service of wireless sense network obtain applying more widely.
Claims (3)
1. a wireless sense network UWB signal framing system, described system comprises wireless sensor node part and wireless sense network fixer network part, the wireless sensor node part is by UWB signal generator (1), RFID label (2), radio communication transmitter module (3) forms, wireless sense network fixer network part is by radio communication receiver module (4), signal-frequenzer (5), signal demodulation module (6), local reference source signal (7), system synchronization module (8), ranging information measurement module (9), data storage (11), locator data processing module (10) and locating information display module (12) form, described system is for the accurate location to the wireless sense network node, it is characterized in that: the output of described reception of wireless signals module (4) is connected to the input of described signal-frequenzer (5), the output of described signal-frequenzer (5) is connected to the first input end of described signal demodulation module (6), the output of described system synchronization module (8) is connected to the input of described local reference source signal (7), the output of described local reference source signal (7) is connected to the second input of described signal demodulation module (6), the output of described signal demodulation module (6) is connected to the input of described ranging information measurement module (9), the output of described ranging information measurement module (9) is connected to the first input end of described locator data processing module (10), the output of described data storage (11) is connected to the second input of described locator data processing module (10), the output of described locator data processing module (10) is connected to the input of described locating information display module (12).
2. a wireless sense network UWB signal framing system, is characterized in that: the UWB pulse signal that the described system employing cycle was 2 nanoseconds.
3. a wireless sense network UWB signal framing system, it is characterized in that: radio communication transmitter module (3) and radio communication receiver module (4) adopt the transmitting-receiving instrument of the SN65HVD11QD of TI company, ranging information measurement module (9) adopts German Innosent transducer, locator data processing module (10) adopts the CC2430 single chip module of TI company, and locating information display module (12) adopts the LQ057Q3DC12 of Sharp color screen display screen.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103913745A (en) * | 2014-04-03 | 2014-07-09 | 重庆市公安局交通管理局 | RFID wireless positioning device and method applied to road |
| CN104143252A (en) * | 2014-07-09 | 2014-11-12 | 无锡蓝赛科技有限公司 | System for real-time monitoring of landslip based on UWB |
| CN106128145A (en) * | 2016-08-23 | 2016-11-16 | 深圳市金溢科技股份有限公司 | UWB electronic tag and awakening method thereof and Vehicle positioning system |
| CN109525936A (en) * | 2018-01-15 | 2019-03-26 | 四川中电昆辰科技有限公司 | Multifrequency point position data return system |
-
2013
- 2013-07-21 CN CN 201320453423 patent/CN203352802U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103913745A (en) * | 2014-04-03 | 2014-07-09 | 重庆市公安局交通管理局 | RFID wireless positioning device and method applied to road |
| CN103913745B (en) * | 2014-04-03 | 2016-09-14 | 重庆市公安局交通管理局 | A kind of RFID radio positioner being applied to road and method |
| CN104143252A (en) * | 2014-07-09 | 2014-11-12 | 无锡蓝赛科技有限公司 | System for real-time monitoring of landslip based on UWB |
| CN106128145A (en) * | 2016-08-23 | 2016-11-16 | 深圳市金溢科技股份有限公司 | UWB electronic tag and awakening method thereof and Vehicle positioning system |
| CN106128145B (en) * | 2016-08-23 | 2019-03-05 | 深圳市金溢科技股份有限公司 | UWB electronic tag and its awakening method and vehicle positioning system |
| CN109525936A (en) * | 2018-01-15 | 2019-03-26 | 四川中电昆辰科技有限公司 | Multifrequency point position data return system |
| CN109525936B (en) * | 2018-01-15 | 2024-03-19 | 四川中电昆辰科技有限公司 | Multi-frequency point position data return system |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
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Addressee: Xu Tongyang Document name: Notification of Termination of Patent Right |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131218 Termination date: 20140721 |
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| EXPY | Termination of patent right or utility model |