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GEO and LEO double-base configuration synthetic radar ground motion imaging method

A radar ground and imaging method technology, applied in radio wave measurement systems, instruments, etc., can solve the problem of unable to focus on the ground moving target imaging, and achieve a good focusing effect

Active Publication Date: 2019-10-25
NORTHWESTERN POLYTECHNICAL UNIV
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  • Application Information

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Problems solved by technology

Due to the non-cooperative characteristics of ground moving targets in the geosynchronous orbit and low-orbit satellite dual-base configuration synthetic radar, direct use of existing SAR imaging technology will not be able to effectively focus on ground moving targets

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  • GEO and LEO double-base configuration synthetic radar ground motion imaging method
  • GEO and LEO double-base configuration synthetic radar ground motion imaging method

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Embodiment Construction

[0019] Now in conjunction with embodiment, accompanying drawing, the present invention will be further described:

[0020] A geosynchronous orbit star and a low orbit satellite dual base configuration synthetic radar ground motion imaging algorithm, specifically comprising the following steps:

[0021] Step 1, the radar system echo signal obtained after clutter suppression is a two-dimensional matrix S(i,j), S(i,j) is an nrn×nan dimensional matrix, and FFT processing is performed on the matrix S(i,j) column , and store the results in the matrix S(i,j) respectively;

[0022] Step 2, according to known radar parameters, construct reference signal vector S_ref(i,1), S_ref(i,1) is nrn×1 vector;

[0023] Among them, nrn represents the number of points in the distance direction;

[0024] Step 3, take out each column of S(i, j) obtained in step 1, and multiply the conjugate of the reference signal vector S_ref(i, 1) by point, to obtain the data matrix S(f n ,x m );

[0025] Amon...

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Abstract

The invention relates to a GEO and LEO double-base configuration synthetic radar ground motion imaging method, which obtains a target imaging result map by sequentially constructing a reference signalvector, a distance walking correction matrix and a Chirp Fourier transform matrix and performing a series of calculations thereon. The GEO and LEO double-base configuration synthetic radar ground motion imaging method overcomes the problem that a defocusing phenomenon can occur because the existing SAR imaging technology cannot form an image of a ground non-cooperative moving target of a geosynchronous orbit and low-orbit satellite double-base configuration synthetic radar, can perform self-adaptive correction on walking of the non-cooperative target of the geosynchronous orbit and low-orbitsatellite double-base configuration synthetic radar, so as to achieve a good focusing effect on the non-cooperative target.

Description

technical field [0001] The invention belongs to the field of radar signal processing, in particular to a ground moving target imaging algorithm for geosynchronous orbit satellites (GEO) and low orbit satellites (LEO) bistatic configuration synthetic radar (Bi-SAR), which is applicable to geosynchronous orbit satellites and low orbit satellites (LEO). Low-orbit satellite bistatic synthetic aperture radar performs imaging processing on ground moving targets. Background technique [0002] Bistatic Synthetic Aperture Radar (Bi-SAR) has good stealth and anti-jamming performance due to the separation of the transmitting and receiving antennas, and the receiving radar is difficult to be detected by reconnaissance. It has a great degree of freedom in the observation of natural targets and man-made targets, which is beneficial to the interpretation of SAR images, and has very important military and civil application values. The Bi-SAR system under the Geosynchronous Orbit (GEO) laun...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/41
CPCG01S7/415
Inventor 张双喜曾红芸熊文俊刘艳阳吴亿峰
Owner NORTHWESTERN POLYTECHNICAL UNIV