Layout method of single ground calibration station for geosar phase calibration

A ground-based calibration and phasing technology, applied in the direction of utilizing re-radiation, special data processing applications, radio wave reflection/re-radiation, etc., can solve the problem of lack of universality and not meeting the requirements of GEOSAR long synthetic aperture imaging phase single-station layout , the lack of the single-station layout method of the GEOSAR phase calibration system, etc., to reduce the complexity, meet the needs of phase calibration, and reduce the cost of layout

CN105527622BActive Publication Date: 2018-07-10INST OF ELECTRONICS CHINESE ACAD OF SCI
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2018-07-10

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Abstract

The invention belongs to the technical field of space-borne synthetic aperture radar signal processing, and specifically relates to a layout method of a single ground calibration station for geosynchronous synthetic aperture radar (GEOSAR) phase calibration. The method comprises: selecting a layout line for the single ground calibration station for GEOSAR phase calibration; selecting a rough site of the single ground calibration station; and optimizing the rough site of the single ground calibration station. By adopting the method, the problem of site selection of the single ground calibration station of a GEOSAR phase calibration system is specifically solved; limited land resource is reasonably utilized, the phase calibration requirement of a GEOSAR specific observation target is met, the layout cost of the ground calibration station is reduced, and the complexity of the GEOSAR phase calibration system is reduced.
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Description

technical field

[0001] The invention belongs to the technical field of spaceborne synthetic aperture radar signal processing, and in particular relates to a layout method of a single ground calibration station for GEOSAR phase calibration. Background technique

[0002] Geosynchronous Synthetic Aperture Radar (Geosynchronous Synthetic Aperture Radar, GEOSAR) is a spaceborne SAR based on a geosynchronous satellite with an orbital height of 36,000km. Geosynchronous orbit SAR phase calibration is a method to obtain motion compensation information for GEOSAR echo The technology uses a ground calibration station whose position is precisely known to transmit a pulsed chirp calibration signal to the GEOSAR satellite, and uses a matched filter pulse compression method to extract phase information from the calibration echo signal to provide post-imaging processing. Accurate phase reference. The accuracy of GEOSAR phase calibration depends on equipment accuracy, atmospheric propagatio...

Examples

Embodiment Construction

[0020] The specific implementation of the present invention will be described below in conjunction with the accompanying drawings. The layout structure of the single ground calibration station used for geosynchronous orbit synthetic aperture radar phase calibration adopted by the present invention is as follows: figure 1 shown.

[0021] The layout method of the single ground calibration station used for GEOSAR phase calibration in this embodiment, as attached figure 2 As shown, its specific implementation process is as follows:

[0022] 1. Select the station layout line of the single ground calibration station for GEOSAR phase calibration

[0023] ① Use the earth-centered and ground-fixed coordinate system as the reference coordinate system;

[0024] ② In the earth-centered earth-fixed coordinate system, calculate the sub-satellite point site at the middle point of the GEOSAR imaging arc;

[0025] ③ Select the great circle line of the earth passing through the target geod...