Imaging method for squint bunching synthetic aperture radar
A technology of synthetic aperture radar and imaging method, which is applied in the field of SAR imaging and can solve problems such as inappropriate imaging processing
Inactive Publication Date: 2013-04-03
NAT UNIV OF DEFENSE TECH
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Its disadvantages are: the two-step imaging method is derived based on the side-looking spotlight SAR imaging model, and is not suitable for imaging processing of squint spotlight SAR
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[0046] The present invention will be further explained below in conjunction with the accompanying drawings.
[0047] figure 1 It is a schematic flow chart of the principle of the squint spotlight SAR imaging method of the present invention. Such as figure 1 As shown, the whole process includes three processing steps: the first step, preprocessing; the second step, azimuth coarse focusing; the third step, fine focusing.
[0048] The squint spotlight SAR imaging method of the present invention is verified through simulation experiments, and the theoretical analysis and simulation experiment results prove the effectiveness of the present invention.
[0049] In the simulation experiment, the radar system parameters are set as figure 2 shown. The imaging scene setting and target layout are as follows: the imaging scene size is 10km×2km (distance direction×azimuth direction), and a total of 9 point targets are set in the imaging scene (ie image 3 Targets marked with a green c...
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The invention provides an imaging method for a squint bunching synthetic aperture radar, which can be used for improving the image quality of a squint bunching SAR (Synthetic Aperture Radar). The technical scheme comprises the following steps of: firstly, on the basis of an original squint bunching SAR echo signal, carrying out Doppler center correction preprocessing by adopting a nonlinear translation method to eliminate the influence on azimuth coarse focusing caused by a squint angle and obtain a preprocessed echo signal; secondly, constructing an azimuth coarse focusing reference signal according to a squint bunching SAR echo signal model and carrying out azimuth coarse focusing processing on a preprocessed echo signal to obtain an echo signal subjected to the azimuth coarse focusing;and finally, carrying out fine focusing processing on the echo signal subjected to the azimuth coarse focusing to obtain an SAR image. According to the imaging method disclosed by the invention, the influence the squint angle on the subsequent azimuth coarse focusing processing is eliminated and the high-precision imaging on the squint bunching SAR with an azimuth spectrum aliasing phenomenon is realized.
Description
technical field [0001] The invention belongs to the field of SAR (Synthetic Aperture Radar, synthetic aperture radar) imaging, and relates to an imaging method suitable for squint spotlight SAR imaging processing. Background technique [0002] Spotlight SAR technology is one of the research hotspots in the field of SAR. In spotlight SAR, by controlling the antenna beam pointing within the synthetic aperture time, the antenna beam illuminates the imaging area for a long time to obtain a larger Doppler bandwidth than strip SAR, thereby achieving high resolution in azimuth. In addition, in spotlight SAR, targets at different azimuth positions in the imaging scene have different center frequencies of the azimuth spectrum, which further increases the total azimuth bandwidth of spotlight SAR echo signals. In order to avoid azimuth spectrum aliasing of the echo signal, the PRF (Pulse Repeat Frequency, pulse repetition frequency) of the SAR system usually needs to be 1.5 to 2 times...
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IPC IPC(8): G01S13/90G01S7/41
Inventor 周智敏黄晓涛安道祥黎向阳李悦丽王广学李欣王增宇
Owner NAT UNIV OF DEFENSE TECH