Phase-coherent accumulation detection method applied to three-order maneuvering target

A technology of coherent accumulation and maneuvering targets, which is applied in the field of coherent accumulation and detection of third-order maneuvering targets, and can solve the problems of blind speed side lobe effect, large calculation amount, and decreased detection performance.

Active Publication Date: 2018-09-18
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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Problems solved by technology

However, both methods are computationally expensive
In addition, there may be blind speed side lobe effects in the GRFT algorithm
T

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  • Phase-coherent accumulation detection method applied to three-order maneuvering target
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  • Phase-coherent accumulation detection method applied to three-order maneuvering target

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Embodiment Construction

[0043] The present invention mainly adopts the method of Matlab simulation experiment to verify, and verifies the correctness and effectiveness of the present invention on the scientific computing software MatlabR2014a. Embodiments of the present invention will be described further below in conjunction with the accompanying drawings.

[0044] see figure 1 , a coherent accumulation detection method applied to third-order maneuvering targets proposed by the present invention is specifically implemented through the following process:

[0045] Step 1: The radar transmitter transmits a chirp signal, performs fast Fourier transform and pulse compression processing on the multi-pulse echo signal received by the radar receiver in the fast time and frequency domain, and obtains the pulse-compressed signal S c (f,t m ), where f is the fast time frequency, t m for slow time.

[0046] In this embodiment, the radar transmitter transmits a chirp signal, performs fast Fourier transform (...

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Abstract

The invention provides a phase-coherent accumulation detection method applied to a three-order maneuvering target, belonging to the technical field of radar signals. The method comprises the followingsteps: carrying out fast-time frequency domain pulse compression on an echo signal, and carrying out three-order Keystone conversion so as to correct three-order range migration of a target; carryingout frequency shift mutual correlation and scale Fourier transform, so as to obtain a defined speed value; eliminating first-order range walk by virtue of the cooperation of a fast-time frequency domain matched filtering equation constructed by the defined speed, combining an accelerated speed with a jerk of the searched target by virtue of a two-dimensional matched filtering equation, and compensating and eliminating second-order range walk and Doppler spreading effect of the target; and detecting the phase-coherent accumulation of the energy of the target by virtue of slow time fast Fouriertransform. According to the method, phase-coherent accumulation is realized by virtue of the range and phase information of the target echo to eliminate the range migration and the Doppler migrationeffect of the three-order maneuvering target, so that the detection performance of radar can be remarkably improved, and the practicability is strong.

Description

technical field [0001] The invention belongs to the technical field of radar signals, in particular to a coherent accumulation detection method applied to third-order maneuvering targets. Background technique [0002] With the vigorous development of aviation technology and stealth technology, maneuvering target detection has gradually become a difficult problem in the field of radar signal processing. Usually, long-term accumulation technology can significantly improve the detection performance of radar. However, the complex motion (including velocity, acceleration and jerk) of the maneuvering target will cause range migration and Doppler migration effects, which will cause the decline of radar cumulative detection performance. Therefore, range and Doppler migration must be eliminated prior to coherent accumulation detection. [0003] In order to correct the first-order distance migration caused by the target speed, the first proposed algorithm is the Keystone transformat...

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Application Information

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IPC IPC(8): G01S7/41
CPCG01S7/41
Inventor 孔令讲孙智孟令同李固冲易伟李小龙崔国龙张天贤
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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