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Multiframe accumulated noncoherent MIMO radar detection and positioning method

A radar detection and positioning method technology, applied in the field of incoherent MIMO radar positioning technology, can solve the problems of echo signal submersion, drop, weak target missed detection and positioning accuracy, etc., and achieve the effect of good detection performance and high positioning accuracy

Active Publication Date: 2015-12-09
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

However, when the target is in a low signal-to-noise ratio environment, the echo signal of this method will be submerged by noise, and there will be problems such as missed detection of weak targets or a sharp drop in positioning accuracy.

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  • Multiframe accumulated noncoherent MIMO radar detection and positioning method
  • Multiframe accumulated noncoherent MIMO radar detection and positioning method
  • Multiframe accumulated noncoherent MIMO radar detection and positioning method

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Embodiment Construction

[0020] The present invention mainly adopts the method of computer simulation to verify, and all steps and conclusions are verified correctly on MATLAB-R2010b. The specific implementation steps are as follows:

[0021] Step 1. Initialize system parameters:

[0022] The initialization system parameters include: the size of the data plane corresponding to the search range near the target, the number of radar transmitters M, the number of receivers N, the positions of each transmitter and receiver, and the transmitted signal waveform s of each radar transmitter h (t), h=1,2,...M, the total number of dynamic programming processing frames K, the observation interval T, the number of state transitions q, the decision threshold V T .

[0023] Step 2, get K frame value function plane:

[0024] 2.1. For each grid point (x, y), calculate the echo delay τ of each channel lk :

[0025] τ l h = ...

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Abstract

The invention discloses a multiframe accumulated noncoherent MIMO radar detection and positioning method, and belongs to the technical field of radar signal processing. The method directs at a weak target in a low signal to noise ratio environment, threshold processing is not performed on single frames, a log-likelihood ratio function is used as a value function, multiframe accumulation is performed on value functions of a few continuous frames according to a state transition relation of the target, information of target multiframe is fully utilized, and after joint processing of multiframe data, a detection result and an estimation position of the target are announced at the same time. The multiframe accumulated noncoherent MIMO radar detection and positioning method solves the problems of large positioning error and missing detection of the weak target in the low signal to noise ratio environment which are likely to occur, and compared with an existing maximum likelihood estimation method, can obtain better detection probability and higher positioning accuracy.

Description

technical field [0001] The invention belongs to the technical field of radar signal processing, in particular to the technical fields of non-coherent MIMO radar positioning technology and radar weak target detection. Background technique [0002] In recent years, MIMO radar has received more and more attention as a new radar system. Incoherent MIMO radar can obtain space diversity gain because its antennas are far apart in space. Therefore, the problem of high-precision positioning of incoherent MIMO radar has aroused great interest of many scholars at home and abroad. However, due to the existence of various uncertain factors, the high-precision positioning of incoherent MIMO radar becomes more challenging. Existing signal-level localization methods based on echo signals usually use maximum likelihood estimation for target localization. However, this method only uses the measurement information of a single frame of the target, and for weak targets under low signal-to-noi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/72
CPCG01S13/72
Inventor 易伟张紫薇杨东超王经鹤崔国龙孔令讲杨建宇刘加欢郑华堃
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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