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A Coherent Accumulation Detection Method Applied to Third-Order Maneuvering Targets

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

Active Publication Date: 2020-06-02
UNIV OF ELECTRONICS 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
The ACCF algorithm can quickly realize coherent accumulation detection, but its detection performance will be significantly reduced

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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 coherent accumulation detection method applied to a third-order maneuvering target, which belongs to the technical field of radar signals. The invention firstly performs pulse compression in the fast time frequency domain on the echo signal, and then uses the third-order Keystone transform to correct the third-order distance migration of the target. The frequency-shifted cross-correlation and scaled Fourier transform are then used to derive a value that defines the velocity. The first-order distance walking is eliminated by using the fast-time frequency-domain matched filter equation constructed by the defined velocity, and the acceleration and jerk of the target are jointly searched by using the two-dimensional matching filter equation in the fast-time-frequency domain, and the second-order distance walking and multi-dimensional walking of the target are compensated and eliminated. Puller diffusion effect. Finally, the coherent accumulation detection of target energy is carried out by slow-time fast Fourier transform. The invention simultaneously utilizes the amplitude and phase information of the target echo to achieve coherent accumulation, eliminates the range migration and Doppler migration effects of the third-order maneuvering target, can significantly improve the detection performance of the radar, and has strong practicability.

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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Patent Type & Authority Patents(China)
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 ELECTRONICS SCI & TECH OF CHINA
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