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Implementation method for wide swath earth observation step scanning mode of synthetic aperture radar

A technology of synthetic aperture radar and wide swath, applied in measuring devices, radio wave measurement systems, radio wave reflection/re-radiation, etc., can solve problems such as lack of SAR satellites, and improve scallop effect, ambiguity ratio and noise The effect of equivalence coefficient uniformity

Active Publication Date: 2012-02-08
INST OF ELECTRONICS CHINESE ACAD OF SCI
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  • Implementation method for wide swath earth observation step scanning mode of synthetic aperture radar
  • Implementation method for wide swath earth observation step scanning mode of synthetic aperture radar
  • Implementation method for wide swath earth observation step scanning mode of synthetic aperture radar

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[0035] A method for realizing the ground observation TOPS mode of a synthetic aperture radar wide surveying band of the present invention, in each sub-band, the antenna scans from the back to the front along the track direction in the azimuth direction and receives the echo, by controlling the antenna azimuth direction The scanning speed is used to change the resolution; after the sub-band scanning is completed, in the range direction, the antenna illuminates different sub-bands by switching the beam pointing to achieve a wide mapping band.

[0036] See attached for specific operation figure 1 , including: determine the antenna according to the basic input parameters (including: earth radius, platform height, platform speed, time margin, sub-band beam center geocentric angle) and the required total width of the surveying swath, system resolution and actual antenna size The azimuth resolution and width of each sub-band when not scanning, and then determine the number of sub-ban...

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Abstract

The invention discloses an implementation method for a wide swath earth observation step scanning mode of a synthetic aperture radar, and relates to a synthetic aperture radar technique. In each sub-band, an antenna is along a track direction in azimuth direction, performs step scanning from back to front and receives returning waves, and the resolution ratio is changed by controlling the azimuthscanning speed of the antenna; and after the sub-band is scanned, in range direction, the beam position is switched to ensure that the antenna illuminates different sub-bands so as to realize wide swath. By the implementation method, the scallop effect of a normal scanning (ScanSAR) mode is obviously improved, and the azimuth resolution, the fuzzy ratio and the noise equivalent coefficients in a whole scene are uniform. When the scanning capacity of the antenna is strong, by the wide swath earth observation step scanning mode, a resolution ratio which is superior to that of the ScanSAR mode can be acquired.

Description

technical field [0001] The present invention relates to the technical field of synthetic aperture radar, which is a synthetic aperture radar (Synthetic Aperture Radar, SAR) high-resolution wide surveying band Terrain Observation by Progressive Scans (TOPS) mode realization method, referred to as TOPSAR mode. The main purpose is to overcome the shortcomings of the ScanSAR mode while retaining the advantages of the ScanSAR mode. Background technique [0002] Synthetic Aperture Radar (SAR) has the characteristics of all-weather and all-time imaging, and has a wide range of applications in the fields of national economy and national defense. As an imaging radar, improving the mapping bandwidth is the pursuit goal of SAR. The ScanSAR mode can increase the width of the surveying swath and achieve large-scale observations under the premise of sacrificing the resolution. ScanSAR periodically switches the range-to-antenna beam to point to several sub-bands to obtain wide coverage ...

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Application Information

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IPC IPC(8): G01S13/90G01S7/02
CPCG01S13/9056
Inventor 郑明洁张志敏何晓燕魏云龙潘涛
Owner INST OF ELECTRONICS CHINESE ACAD OF SCI
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