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Measuring Method of Range Pattern of SAR Antenna in Middle and High Orbit Based on Calibration Satellite

A measurement method, a technology for medium and high orbits, used in radio wave measurement systems, measurement devices, reflection/re-radiation of radio waves, etc.

Active Publication Date: 2020-10-27
INST OF ELECTRONICS CHINESE ACAD OF SCI
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Problems solved by technology

[0007] The purpose of the present invention is to provide a method for measuring the range pattern of the medium and high orbit SAR antenna based on the calibration satellite, so as to solve the problem of measuring the range pattern of the medium and high orbit SAR antenna

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  • Measuring Method of Range Pattern of SAR Antenna in Middle and High Orbit Based on Calibration Satellite
  • Measuring Method of Range Pattern of SAR Antenna in Middle and High Orbit Based on Calibration Satellite
  • Measuring Method of Range Pattern of SAR Antenna in Middle and High Orbit Based on Calibration Satellite

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[0045] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0046] It should be noted in advance that in this patent application, the orbital height of the calibration satellite is lower than that of the mid-high orbit SAR satellite, and the orbital directions of the two intersect, wherein the mid-high orbit SAR satellite refers to an orbital height higher than or Equivalent to a SAR satellite of 1000km.

[0047] It should also be noted that in this patent application, along-orbit and cross-orbit are defined relative to the trajectory of the middle-high orbit SAR satellite, that is, parallel to the trajectory of the middle-high orbit SAR satellite is called along-orbit, and the same as the middle-high orbit SAR satellite. The trajectory of the SAR satellite is vertically called cr...

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Abstract

The invention discloses a method for measuring a range directional diagram of a medium-high-orbit SAR antenna based on a calibration satellite. The method comprises: carrying out calculation based onorbital parameters of a medium-high-orbit SAR satellite to obtain orbit parameters of a calibration satellite; according to the orbital parameters of the medium-high-orbit SAR satellite and the calibration satellite, carrying out calculation to obtain parameters of a standard receiver of the calibration satellite; designing the standard receiver according to the parameters of the standard receiverof the calibration satellite; and carrying out collection and processing on a signal pulse string emitted by the medium-high-orbit SAR satellite by the standard receiver to obtain a range directionaldiagram of a medium-high-orbit SAR antenna. The orbital height of the calibration satellite is lower than that of the medium-high-orbit SAR satellite; and the orbital directions of the two satellitesare intersected. Therefore, problems that the surveying bandwidth, point target and distributed target methods in the measurement of the range directional diagram of the medium-high-orbit SAR antennacan be implemented are solved.

Description

technical field [0001] The invention belongs to the technical field of radar earth observation, and in particular relates to a method for measuring the range pattern of a medium-high orbit SAR antenna based on a calibration satellite. Background technique [0002] Space-borne synthetic aperture radar (Synthetic Aperture Radar: SAR) is an important sensor for earth observation. Space-borne SAR requires strict on-orbit radiometric calibration to ensure its relative and absolute radiometric accuracy in order to convert the gray scale of SAR images to Converted to the quantitative application of ground object backscatter information, the range antenna pattern measurement of the spaceborne SAR antenna is the most important factor affecting the relative radiation accuracy of the SAR image. Any method of measuring the antenna range pattern requires a calibration reference target with known radar cross section (Radar Cross Section: RCS) or backscattering characteristics. The tradit...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/90G01S7/40
Inventor 王宇郑巧娜洪峻丁赤飚朱勇涛李亮杜少岩
Owner INST OF ELECTRONICS CHINESE ACAD OF SCI
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