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Ground moving target imaging method for single-channel synthetic aperture radar (SAR)

A ground moving target and moving target technology, which is applied in the field of single-channel synthetic aperture radar ground moving target imaging, can solve the problems of increased computational complexity of the system, large amount of processing calculation, and reduced performance of detecting moving targets, etc. Avoid computationally expensive effects

Inactive Publication Date: 2012-02-15
XIDIAN UNIV
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Problems solved by technology

The disadvantage of this method is that the moving target detection method in this method is realized by the multi-feature "centroid" agglomeration classification of moving targets, so this method is to perform distance migration correction and Self-focusing processing, the amount of processing calculation is relatively large
Moreover, the improper selection of correlation pulse accumulation (CPI) of this method will cause the performance degradation of detecting moving targets and the increase of system computational complexity

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  • Ground moving target imaging method for single-channel synthetic aperture radar (SAR)
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  • Ground moving target imaging method for single-channel synthetic aperture radar (SAR)

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Embodiment Construction

[0044] Attached below figure 1 The steps of the present invention are described in further detail.

[0045] Step 1. Correct the distance bend

[0046] 1a) The range-matched filtering method is adopted to compress the echo data received by the radar. The distance matched filtering method is to multiply the echo signal in the range frequency domain by the distance matched filtering reference signal to complete the distance compression of the echo signal:

[0047] s r = exp ( jπ f r 2 k r )

[0048] Where s r Is the distance matched filter reference signal, exp(·) represents the index, j represents the phase of the index, f r Is the range frequency of the signal, k r Is the frequency modulation of the transmitted signal.

[0049] 1b) Perform a second-order generalized keystone transformation on the data after distance compression: replace the slow time of the data after distance compression with the following variables to complete the correction of ...

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Abstract

The invention discloses a ground moving target imaging method for a single-channel synthetic aperture radar (SAR). The method comprises the following steps of: (1) correcting distance curvature; (2) correcting distance migration; (3) estimating Doppler parameters; (4) estimating motion parameters; (5) compressing a direction; and (6) repeating the steps until all moving targets are processed. In the invention, the distance curvature of moving target echo data is corrected by second-order Keystone transform, so the method has the advantage of high-resolution SAR data imaging; by uniformly correcting the distance curvature of all stationary targets and all moving targets, the defect of large computation amount in the prior art is overcome; and by building a second-order moving target imaging model, parameter estimation and imaging of maneuvering moving targets can be performed, and the moving states of the moving targets can be more accurately described from aspects of speed, acceleration and the like.

Description

Technical field [0001] The invention belongs to the technical field of signal processing, and further relates to a single-channel synthetic aperture radar (SAR) ground moving target imaging method in the technical field of airborne single-channel radar. This method can effectively image, locate and accurately estimate motion parameters of ground moving targets. Background technique [0002] Synthetic Aperture Radar imaging technology For ground-stationary scenes, as long as the trajectory of the radar moving platform is known, the relative displacement of the radar and the target can be accurately known. High-resolution synthetic aperture radar (SAR) images can be obtained through matched filter processing. However, the situation for moving targets on the ground is different, because in most cases the motion information of moving targets has no prior knowledge. If the Doppler parameters estimated by stationary targets are used for matching filtering, the moving targets will not b...

Claims

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Application Information

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IPC IPC(8): G01S13/90G01S7/41
Inventor 周峰黄大荣保铮
Owner XIDIAN UNIV
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