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Target detection method based on Keystone and matched filtering

A matched filter and target detection technology, applied in radio wave measurement systems, instruments, etc., can solve problems such as complex calculations and affecting the real-time performance of radar signal processing

Active Publication Date: 2017-07-21
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

However, the calculation of the generalized Radon Fourier transform is very complicated, which affects the real-time performance of radar signal processing

Method used

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  • Target detection method based on Keystone and matched filtering
  • Target detection method based on Keystone and matched filtering
  • Target detection method based on Keystone and matched filtering

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Embodiment Construction

[0030] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the embodiments and accompanying drawings.

[0031] The present invention mainly adopts the method of simulation experiment for verification, and all steps and conclusions are verified on the scientific computing software Matlab R2014a for correctness. Combine below figure 1 Provide the specific implementation mode of the present invention:

[0032] Step 1: Echo Pulse Compression:

[0033] 1-1) Using Matlab R2014a to simulate the radar transmitting a chirp signal to a single target and get the echo signal in is fast time; t m =mT(m=0,1,...,M-1) is the slow time, that is, the time required for the mth pulse; T is the pulse repetition interval, and M represents the total number of pulses. target and radar at t m The distances in time are as follows:

[0034]

[0035] where, r ...

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Abstract

The invention discloses a target detection method based on Keystone and matched filtering and belongs to the radar weak signal detection technology field. The method comprises steps that firstly, a radar is utilized to emit a chirp signal, pulse compression for a received target echo signal is carried out, and first-order range migration caused by no fuzzy speed of a target is corrected through utilizing Keystone transformation; secondly, a fuzzy speed multiple and acceleration of the target are estimated through utilizing combined two-dimensional matched filtering processing of a distance frequency domain, and first-order range migration caused by the fuzzy speed of the target and second-order range bending and Doppler migration caused by acceleration are corrected and compensated; and lastly, phase-coherent accumulation of target energy is realized through fast Fourier transform, and a peak value of phase-coherent accumulation is utilized to carry out target detection. The method is advantaged in that amplitude and the phase information of target echoes are utilized to carry out long time phase-coherent accumulation, so a radar echo signal-to-noise ratio can be effectively improved, and target detection performance of the radar can be improved.

Description

technical field [0001] The invention belongs to the mobile target detection technology in the technical field of radar, and specifically relates to a target detection method based on Keystone and matched filtering. Background technique [0002] In recent years, with the progress of science and technology, especially the continuous development of aerospace technology and the maturity of modern stealth technology, how to accurately and effectively realize the detection of weak targets has become a difficult problem in the field of radar signal processing. The traditional solution is to change the parameters of the radar system by adopting the preferred radar transmission frequency, increasing the transmitting power of the transmitter, reducing the noise figure of the receiver, and increasing the antenna aperture. However, these methods are often limited by engineering implementation, significantly increasing the cost of system development. In order to improve the ability of r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/41
CPCG01S7/41
Inventor 易伟孙智陈璐黄鑫李小龙李洋漾孔令讲崔国龙
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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