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Full-aperture imaging method for multi-channel wave beam-pointing synthetic aperture radar (SAR)

A technology of beam pointing and imaging methods, which is applied in the reflection/re-radiation of radio waves, radio wave measurement systems, and the use of re-radiation, etc. It can solve the problems of SAR imaging processing problems and other problems.

Active Publication Date: 2014-06-04
XIDIAN UNIV
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Problems solved by technology

[0006] The above methods cannot well solve the imaging processing problem of multi-channel beam pointing SAR

Method used

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  • Full-aperture imaging method for multi-channel wave beam-pointing synthetic aperture radar (SAR)
  • Full-aperture imaging method for multi-channel wave beam-pointing synthetic aperture radar (SAR)
  • Full-aperture imaging method for multi-channel wave beam-pointing synthetic aperture radar (SAR)

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Embodiment Construction

[0048] refer to figure 1 , the SAR imaging processing implementation steps of the present invention are as follows:

[0049] Step 1. In the beam-pointing SAR mode, in order to avoid the complex problems caused by the sub-aperture block, the original SAR echo signal is received by the full aperture in the channel mode of one transmission and multiple reception.

[0050] Step 2: Perform azimuth bandwidth compression processing and beam compression processing on the echo signal to solve the problem of excessive beam-pointing SAR azimuth bandwidth.

[0051] 2a) Construct the azimuth bandwidth compression function H′(t a , X m ) and beam compression function H(t a , X m )for:

[0052] H ( t a , X m ) = exp ( - j 2 πα ( ...

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Abstract

The invention discloses a full-aperture imaging method for multi-channel wave beam-pointing synthetic aperture radar (SAR), and mainly solves the problem of low imaging resolution in a wide scene. The full-aperture imaging method comprises the following implementation processes of: (1) receiving original SAR echo signals in a full-aperture way in a one-transmitting multi-receiving channel mode; (2) performing azimuth bandwidth compressing processing and wave beam compressing processing on the echo signals; (3) recovering and reconstructing the compressed echo signals by a Doppler space-time adaptive post-processing method; (4) transforming the recovered and reconstructed echo signals into a two-dimensional frequency domain; and (5) performing distance migration correction and pulse compression on the echo signals in the two-dimensional frequency domain by utilizing a Doppler imaging algorithm to realize imaging. According to the method, the azimuth resolution is improved by utilizing the wave beam-pointing SAR; the problem that the bandwidth of the wave beam-pointing SAR is over-wide is solved by compressing a wave beam domain and an angle domain; simultaneously, an imaging processing flow is simplified; the imaging processing efficiency is improved; and the method can be used in the SAR imaging of a space-borne platform under the requirements of wide scene and high resolution.

Description

technical field [0001] The invention belongs to the field of radar signal processing, in particular to a full-aperture imaging method for multi-channel beam pointing synthetic aperture radar SAR, which is suitable for SAR imaging processing on a spaceborne platform. Background technique [0002] In a conventional spaceborne SAR system, high azimuth resolution requires an increase in the azimuth bandwidth. After the azimuth bandwidth is increased, a larger azimuth sampling rate PRF is required to avoid ambiguity in the azimuth. However, a large scene coverage area requires a smaller PRF to ensure that adjacent echo sequences do not overlap. Therefore, the azimuth resolution of the observed scene and the size of the scene are a pair of contradictions. [0003] In order to ensure a large observation scene and solve the problem of ambiguity in azimuth, a multi-channel SAR system is proposed. In a multi-channel SAR system, the PRF is usually smaller than the azimuth bandwidth o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/90
Inventor 孙光才邢孟道张升保铮
Owner XIDIAN UNIV
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