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Positioning system only using Doppler information based on radar sensor network

A radar sensor and Doppler information technology, which is applied in the field of positioning technology using only target echo Doppler information, can solve problems such as difficulty in obtaining, failure, and increased computational complexity, and achieve high-precision two-dimensional positioning and fast two-dimensional positioning. The effect of dimensional positioning and complexity growth

Active Publication Date: 2015-11-11
合肥四相至新科技有限公司
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  • Application Information

AI Technical Summary

Problems solved by technology

In fact, the target speed information (direction, size) is unknown, and it is difficult to obtain it in non-cooperative estimation; adding information such as TOA is actually not only using Doppler information for positioning, but still requires system time synchronization, so it cannot be realized Practical Doppler Information Only Positioning System
[0004] In the inventions CN101561499B and CN102004244B, only the radial distance between the target and the radar can be obtained through an iterative algorithm, and it is impossible to estimate the position of the 2-dimensional plane target
At the same time, this method is ineffective for targets whose movement direction is far away from or close to the radar line of sight
[0005] In addition, the literature [Y.KalkanandB.Baykal, "Multipletargetlocalization&dataassociationforfrequency-onlywidelyseparatedMIMOradar,"DigitalSignalProcessing, vol.25, pp.51-61, 2014.] proposes a method of using only Doppler information to obtain the positioning of the target position and multi-target processing method, but this method is affected by the number of targets and the number of radar sensors
When the number of targets is large, the separation of the velocity information corresponding to each target, or, when high precision is required and the number of radar sensors needs to be increased, the computational complexity will increase dramatically

Method used

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  • Positioning system only using Doppler information based on radar sensor network
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  • Positioning system only using Doppler information based on radar sensor network

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Experimental program
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Embodiment 1

[0150] As an airport surface surveillance radar, the system locates multiple aircraft on the ground within the airport range. Set the radius of the circular area to be measured to 700m. Radar sensors are evenly arranged on a circle with a radius of 1000m starting from the north direction, and a total of 32 radar sensors form a network of radar sensors. The range of speed measurement is 1m / s to 30m / s. Let the number of targets in the scene be K. The target position is given by the polar coordinates (r k ,θ k ) description, the velocity is determined by the velocity magnitude v_A k and velocity direction v_θ k Description, the subscript k represents the kth target, k=1,2,...K. In step 1, the signal baseband sampling rate fs is 5000 Hz, and the number of sampling points Ns is 4096 points. The signal-to-noise ratio of the echo signal received by the radar is 10dB.

[0151] The central frequency of the transmitted signal of each radar sensor in the system is determined by t...

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Abstract

The invention provides a positioning system only using Doppler information based on a radar sensor network. The positioning system comprises the radar sensor network and an information fusion center. According to a special radar sensor distribution shape, the projection value of each radar sensor including an orthogonal demodulation structure of uniform motion target speed under the distribution shape is enabled to be approximate to a sinusoidal waveform so that Doppler speed of all targets corresponding to different radar sensors can be separated out more rapidly, and degree of complexity is not substantially increased due to increasing of the number of the targets and the radar sensors.

Description

technical field [0001] The invention belongs to a positioning method in the technical field of radar, and in particular relates to a positioning technology using only target echo Doppler information. Background technique [0002] Existing radar sensor networks, typically such as MIMO radar systems, distributed multistatic radar systems, etc., usually use time-related position estimation methods such as time-of-arrival (TOA) and time-difference-of-arrival (TDOA). However, the above position estimation methods are inseparable from the time synchronization of the system, and it is very difficult to achieve time synchronization at low cost. A new positioning method, which uses only Doppler information, does not need time synchronization and can directly estimate the target position, which provides the possibility of low-cost high-precision positioning. [0003] The method of positioning using Doppler information, such as the literature [Li Hua. Multi-station differential Dopple...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/46
CPCG01S13/46
Inventor 陈祝明王千里吴天军
Owner 合肥四相至新科技有限公司
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