GEOSAR forwarding type phase scaling method

A forwarding, phase technology, applied in the direction of reflection/re-radiation of radio waves, use of re-radiation, measurement devices, etc., to achieve the effect of reducing the difficulty of realization, meeting the needs of imaging motion compensation, and reducing the accuracy requirements

Inactive Publication Date: 2016-05-04
INST OF ELECTRONICS CHINESE ACAD OF SCI
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Problems solved by technology

[0010] In order to solve the above-mentioned technical problems, the present invention provides a GEOSAR forward-type phase calibration method, which decomposes the GEOSAR imaging motion compensation into two stages of coarse compensation and fine compensation. The coarse compensation stage is obtained by using the existing base satellite orbit determination technology The coarse motion compensation information of GEOSAR imaging, the fine compensation stage is to use the GEOSAR forwarding phase calibration method provided by the present invention to obtain the fine motion compensation information of GEOSAR imaging, so that the GEOSAR forwarding phase calibration technology provided by the present invention and the existing The combination of ground-based satellite orbit determination technology makes up for the defect that the existing ground-based satellite orbit determination technology's orbit determination accuracy cannot fully meet the GEOSAR imaging compensation requirements

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[0024] The specific implementation of the present invention will be described below in conjunction with the accompanying drawings. The invention is a GEOSAR forwarding phase calibration method, and its purpose is to obtain the compensation information needed in the refined motion compensation stage of GEOSAR imaging. The structural diagram of the GEOSAR forwarding phase calibration method is as follows: figure 1 Shown:

[0025] (1) Equip a GEOSAR satellite with an on-board phase calibration device for phase calibration signal transmission, reception and processing;

[0026] (2) One or more ground calibration stations whose positions are precisely known are set up on the ground to receive and forward the chirp phase calibration signal of the pulse system transmitted by the GEOSAR satellite;

[0027] (3) A ground post-processing device for processing phase-scaled echo data is installed on the ground part of GEOSAR.

[0028] An embodiment of the present invention provides a GE...

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Abstract

The invention discloses a geosynchronous synthetic aperture radar (GEOSAR) forwarding type phase scaling method, belongs to the technical field of spaceborne synthetic aperture radar signal processing, and provides a geosynchronous synthetic aperture radar (GEOSAR) forwarding type phase scaling method for obtaining accurate phase scaling information. GEOSAR imaging motion compensation is divided into a coarse compensation phase and a fine compensation phase, at the coarse compensation phase, imaging motion coarse compensation is carried out by use of orbit determination information obtained through a conventional ground-based satellite orbit determination technology, and at the fine compensation phase, imaging motion fine compensation is carried out by use of additional phase information obtained by use of the method provided by the invention. The GEOSAR forwarding type phase scaling technology provided by the invention and the conventional ground-based satellite orbit determination technology are combined together such that the defect that orbit determination precision of the conventional ground-based satellite orbit determination technology cannot completely satisfy GEOSAR imaging compensation requirements is made up for.

Description

technical field [0001] The invention belongs to the technical field of spaceborne synthetic aperture radar signal processing, and in particular relates to a GEOSAR forwarding type phase calibration method. Background technique [0002] Geosynchronous Orbit Synthetic Aperture Radar (referred to as Geosynchronous Orbit SAR, or GEOSAR) is a high-orbit spaceborne SAR imaging technology, and its imaging process requires accurate motion compensation information. Since only low-orbit spaceborne SAR is currently in orbit, there is no high-orbit GEOSAR in orbit, and there is no GEOSAR motion compensation information acquisition technology. The only analogy available is the low-orbit spaceborne SAR motion compensation information acquisition technology. There are three common types of low-orbit space-borne SAR acquisition motion compensation information technology: one is based on SAR target echo data acquisition technology, one is based on satellite navigation and positioning system...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/40G01S13/90
CPCG01S7/40G01S13/9029G01S13/9058
Inventor 胡文龙江冕黄丽佳丁赤飚
Owner INST OF ELECTRONICS CHINESE ACAD OF SCI
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