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Improved dual-channel sparse SAR moving target detection method based on zero-space adjustment

A technology of moving target detection and zero space adjustment, which is applied in measuring devices, radio wave measurement systems, radio wave reflection/re-radiation, etc., and can solve problems such as inapplicability

Active Publication Date: 2018-03-06
XIDIAN UNIV
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Problems solved by technology

This algorithm utilizes the null space information of the observation matrix to enhance the accuracy and speed of sparse reconstruction, but requires the known sparsity of the target vector, so it cannot be applied to the field of synthetic aperture radar (SAR) moving target detection

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  • Improved dual-channel sparse SAR moving target detection method based on zero-space adjustment
  • Improved dual-channel sparse SAR moving target detection method based on zero-space adjustment
  • Improved dual-channel sparse SAR moving target detection method based on zero-space adjustment

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Embodiment Construction

[0057] An improved dual-channel sparse SAR moving target detection method based on null space adjustment of the present invention comprises the following steps:

[0058] Step 1. Obtain the sparse SAR echo data of the dual-channel front and side view, that is, the echo data of channel 1 s 1 and channel two echo data s 2 .

[0059] refer to figure 1 , is a schematic diagram of dual-channel side-looking sparse SAR echo data sampling in the present invention. The invention is suitable for dual-channel front and side-looking synthetic aperture radars. figure 1 C1 represents channel one, C2 represents channel two, T(t 0 ) means that the target is at t 0 time position, T(t m ) means that the target is at t m Time position, channel one randomly transmits pulses, and two channels receive pulses at the same time, Δt is the sparse sampling time interval, t m The instant slant distance between target and channel 1 is R 1 (t m ), t m The instantaneous slant distance between the ...

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Abstract

The invention discloses a null-space-tuning-based dual-channel sparse SAR moving target detection improvement method comprising the following steps that firstly dual-channel side-looking sparse SAR echo data are acquired, i.e. the first-channel echo data s1 and the second-channel echo data s2 are acquired; a first-channel observation matrix A and a second-channel observation matrix B are respectively constructed, and a transformation matrix T and a dual-channel joint observation matrix phi are respectively constructed so that a reconstruction matrix phi and an echo transformation matrix R are obtained; then dual-channel joint echo data s are obtained according to the first-channel echo data s1, the second-channel echo data s2 and the echo transformation matrix R through transformation; and finally a null-space-tuning-based sparse reconstruction algorithm is improved by the reconstruction matrix phi and the dual-channel joint echo data s so that moving target position information is obtained, and rapid and high-precision detection of a dual-channel sparse SAR moving target can be realized.

Description

technical field [0001] The invention belongs to the technical field of synthetic aperture radar (SAR) moving target detection, in particular to an improved dual-channel sparse SAR moving target detection method based on zero space adjustment, which is suitable for practical engineering applications. Background technique [0002] Compressed sensing technology can effectively relieve the pressure of data storage and transmission, and has been widely used in the fields of optics, computer and image processing. Compressed sensing technology is also used in the field of synthetic aperture radar (SAR) moving target detection to alleviate the problems of high sampling rate and large amount of data in SAR moving target detection. Compressed sensing theory points out that as long as the signal is compressible or sparse in a certain transform domain, the transformed high-dimensional signal can be projected onto a low-dimensional space with an observation matrix unrelated to the transf...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/292G01S13/28G01S13/90
CPCG01S7/2923G01S7/2928G01S13/28G01S13/9017G01S13/9029
Inventor 朱圣棋王震廖桂生张骏杰宋萌萌曾操霍恩来
Owner XIDIAN UNIV
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