Position rotation transformation-based high-speed target phase-coherent accumulation detection method

A technology of rotation transformation and coherent accumulation, applied in the field of radar, can solve the problems of interpolation accumulation loss, complex calculation, Doppler ambiguity effect, etc., and achieve the effect of facilitating engineering realization, improving signal-to-noise ratio, and suppressing noise

Inactive Publication Date: 2017-06-27
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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However, in the case of high target speed, this method tends to suffer from Doppler ambiguity and the accumulation loss of interpolation
The Radon Fourier transform needs to coherently accumulate the target energy through the two-dimensional joint search of distance and velocity, and the ...

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[0032] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the implementation methods and accompanying drawings.

[0033] The present invention mainly adopts the method of simulation experiment to verify, and all steps and conclusions are verified on the scientific computing software Matlab R2014a. Combine below figure 1 Provide the specific implementation of the present invention:

[0034] Step 1: Echo pulse compression: Use Matlab R2014a to simulate radar to transmit chirp signal to a single target and obtain echo data s r (t m ,t n ), the s r (t m ,t n ) for pulse compression to get s c (t m ,t n ), where t m =mT(m=0,1,...,M-1) is the slow time, that is, the time required for the mth pulse; is the fast time, that is, the time corresponding to the nth distance unit; T is the pulse repetition interval, which is numerically equal to the ...

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Abstract

The present invention discloses a position rotation transformation-based high-speed target phase-coherent accumulation detection method and belongs to the technical field of radar weak signal detection. The method is characterized by comprising the following steps: firstly, subjecting a received echo signal of a target to pulse compression through sending out a linear frequency modulation signal by using a radar; secondly, searching the rotation angle of echo data positions after pulse compression, and estimating the speed through the position rotation transformation traversal; thirdly, based on the searched rotation angle, subjecting all echo data positions to integral rotation to correct the first-order range migration; finally, realizing the phase-coherent accumulation of the target energy through the quick Fourier transformation process, and enabling the target detection based on an accumulated peak value. According to the technical scheme of the invention, the echo amplitude and the phase information of a moving target are subjected to phase-coherent accumulation, so that the radar echo signal-to-noise ratio is effectively improved. Therefore, the detection performance of the radar on the target is improved. All operations can be realized based on the quick Fourier transformation process, so that the engineering realization is facilitated. The method has popularization and application value.

Description

technical field [0001] The invention belongs to the technical field of radar and relates to a high-speed target detection technology, specifically a high-speed target coherent accumulation detection method based on position rotation transformation, which can be used for radar detection processing of high-speed weak targets in complex environments. Background technique [0002] In recent years, with the development of science and technology, especially the continuous development of high-speed flight technology and the increasing maturity of modern stealth technology, how to accurately and effectively detect high-speed targets has become a difficult problem in the field of radar signal processing. The traditional solution is to use the preferred radar transmission frequency, increase the transmission power of the transmitter, reduce the noise figure of the receiver, increase the antenna aperture and other measures to change the parameters of the radar system. However, these me...

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Application Information

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IPC IPC(8): G01S13/88
Inventor 易伟孙智陈璐李洋漾李小龙徐璐霄孔令讲崔国龙
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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