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A spaceborne SAR system and its construction method

A construction method and spaceborne technology, applied in the spaceborne SAR system and its construction field, can solve the problems of imaging performance changes, long synthetic aperture time, denaturation, etc., and achieve the effect of improving image quality consistency and facilitating constellation design

Active Publication Date: 2019-12-03
INST OF ELECTRONICS CHINESE ACAD OF SCI
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Problems solved by technology

However, the GEO SAR system built by the existing technology has a relatively long synthetic aperture time, significant time-varying satellite-ground relative motion, and imaging performance that varies drastically with latitude and longitude

Method used

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  • A spaceborne SAR system and its construction method
  • A spaceborne SAR system and its construction method
  • A spaceborne SAR system and its construction method

Examples

Experimental program
Comparison scheme
Effect test

experiment example 1

[0071] Next, a computer simulation experiment is used to design a space-borne SAR system. Firstly, the imaging duration of a SAR device on a satellite is calculated.

[0072] Set imageable constraints:

[0073] Synthetic Aperture Time SAT Capped SAT Max Equal to 300 seconds (the nominal resolution in the equidistance direction reaches 5 meters, that is, the first threshold ρ iso-rg = 5);

[0074] Signal bandwidth SB upper limit SB Max Equal to 100 MHz (the nominal resolution in the Doppler direction reaches 5 meters, which is the second threshold ρ iso-az = 5);

[0075] Incidence angle IA lower limit IA Min Equal to 10 degrees, the incident angle IA upper limit IA Max equal to 70 degrees;

[0076] The lower limit of GRIA between the distance from the ground to the plane and the angle between the azimuth resolution and the azimuth resolution Min It is equal to 30 degrees.

[0077] Set the target area that needs to be imaged within 24 hours, for example, select the foll...

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Abstract

The present invention relates to a satellite-borne SAR constellation system and a construction method thereof. The satellite-borne SAR constellation system comprises at least one SAR device arranged on at least one satellite in a one-to-one correspondence manner, the satellite operates in a geosynchronous orbit, and the rotation direction of the satellite is reverse with the rotation direction of the earth. The construction method of the satellite-borne SAR system comprises the steps of calculating the imaging duration of the SAR device arranged on the satellite; based on the imaging duration, calculating the number of the satellites, and establishing the satellite rolling maneuver control requirement of the satellite-borne SAR system and the orientation scanning control requirements of the SAR devices.

Description

technical field [0001] The invention relates to the technical field of synthetic aperture radar, in particular to a spaceborne SAR system and a construction method thereof. Background technique [0002] Synthetic Aperture Radar (SAR) is an active microwave remote sensing system that can be installed on aircraft, satellites and other platforms to achieve all-weather and all-weather earth observation, and has a certain ability to penetrate ground objects. SAR uses pulse signal compression technology to achieve high resolution in the line of sight direction, uses platform motion equivalent synthetic large-aperture antennas to achieve high resolution in the velocity direction, and then obtains two-dimensional high-resolution images of the surface. , the environment, disasters, surveying and mapping, and the military have played an important role. From the perspective of orbital height, spaceborne SAR can be divided into: low-orbit spaceborne SAR (orbital altitude below 1000km, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/90
CPCG01S13/90
Inventor 丁赤飚黄丽佳雷斌胡玉新仇晓兰
Owner INST OF ELECTRONICS CHINESE ACAD OF SCI
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