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High-resolution wide-width satellite-borne mosaic SAR imaging processing method and system

An imaging processing and mosaic technology, applied in radio wave measurement systems, radio wave reflection/re-radiation, utilization of re-radiation, etc., can solve the problems of spaceborne high-resolution and wide-width Mosaic-SAR imaging processing.

Active Publication Date: 2019-09-06
XIAN INSTITUE OF SPACE RADIO TECH
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Problems solved by technology

[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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  • High-resolution wide-width satellite-borne mosaic SAR imaging processing method and system

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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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Abstract

The invention discloses a high-resolution wide-width satellite-borne mosaic SAR imaging processing method and system, wherein the method provides and analyzes the azimuth signal expansion problem after Range Cell Migration Correction (RCMC) is carried out by using a high-precision Range Cell Migration Correction Algorithm (RMA) under a large squint angle, then changes of Doppler central frequencyalong with range frequency, equivalent speed two-dimensional space variation and high-squint high-precision RCMC are solved by an imaging processing mode of azimuth molecular aperture up-sampling + azimuth signal expansion + RMA-RCMC + azimuth scale scaling + azimuth SPECAN, and high-resolution wide-width mosaic SAR high-precision imaging is realized. Compared with other algorithms such as a two-step algorithm and the like, the high-resolution wide-width satellite-borne mosaic SAR imaging processing method has the advantages that the obtained image sampling unit is more equivalent to the resolution magnitude, the data processing efficiency is higher, and the limitation of processing high-resolution wide-width mosaics by a sub-aperture method is effectively solved. Meanwhile, the high-resolution wide-width satellite-borne mosaic SAR imaging processing method is high in algorithm precision, stable and strong in 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
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
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