A high-resolution and wide-format spaceborne mosaic SAR imaging processing method and system
An imaging processing and mosaic technology, which is applied in radio wave measurement systems, instruments, measurement devices, etc., can solve the problems of spaceborne high-resolution and wide-format Mosaic-SAR imaging processing, etc., and achieve the effect of high-precision imaging.
Active Publication Date: 2021-06-11
XIAN INSTITUE OF SPACE RADIO TECH
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[0004] The technical problem solved by the present invention is: to overcome the deficiencies of the prior art, aiming at the problem that the existing method cannot solve the problem of space-borne high-resolution and wide-range Mosaic-SAR imaging processing, a high-resolution and wide-range space-borne mosaic SAR imaging processing method is provided and system, effectively realizing the high-precision imaging of high-resolution and wide-format mosaic SAR
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[0054] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided for more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and examples.
[0055] figure 1 It is a flow chart of the high-resolution and wide-format spaceborne mosaic SAR imaging processing method provided by the embodiment of the p...
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The invention discloses a method and system for processing high-resolution and wide-format space-borne mosaic SAR imaging, wherein the method proposes and analyzes range migration correction (RCMC) using a high-precision range migration correction algorithm (RMA) at a large oblique angle of view. ) after the azimuth signal expansion problem, and then through the imaging processing method of azimuth molecular aperture upsampling + azimuth signal expansion + RMA-RCMC + azimuth scale scaling + azimuth SPECAN to solve the change of Doppler center frequency with distance frequency, equivalent velocity Two-dimensional space variation and large squint high-precision RCMC realize high-precision imaging of high-resolution and wide-field mosaic SAR. Compared with other algorithms such as the two-step method, the obtained image sampling unit and resolution are more equivalent, and have higher data processing efficiency, and effectively solve the limitations of the sub-aperture method in processing high-resolution wide-format mosaics. At the same time, the algorithm in the present invention has high precision, robustness and strong practicability.
Description
technical field [0001] The invention belongs to the field of space microwave radar signal processing, and in particular relates to a method and system for processing high-resolution and wide-width spaceborne mosaic SAR imaging. Background technique [0002] In the application of space-borne SAR system for high-resolution wide-range reconnaissance and confirmation of sea and land targets, in order to obtain wide-range SAR imaging capabilities with higher azimuth resolution than ScanSAR and TOPSAR modes, it is necessary to use Mosaic-SAR (Mosaic-SAR ) mode, through azimuth beam large-angle scanning and range beam switching to ensure azimuth high resolution and range wide swath. Using space-borne Mosaic-SAR to achieve high resolution and wide width, especially when azimuth high resolution and wide swath is required, the azimuth beam scanning angle will be very large, even up to ±30°. At this time, the difficulties faced by Mosaic-SAR imaging processing include two-dimensional ...
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IPC IPC(8): G01S13/90
CPCG01S13/9011G01S13/9017G01S13/9094G01S13/9004
Inventor 杨娟娟高阳贺荣荣吴疆党红杏谭小敏王万林
Owner XIAN INSTITUE OF SPACE RADIO TECH