Positioning system only using Doppler information based on radar sensor network

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...

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

Images