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

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

CN105548980AInactive Publication Date: 2016-05-04INST OF ELECTRONICS CHINESE ACAD OF SCI
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  • GEOSAR forwarding type phase scaling method
  • GEOSAR forwarding type phase scaling method

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Embodiment Construction

[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

Patent Timeline
04 May 2016
Publication
CN105548980A
IPC
G01S7/40; G01S13/90
CPC
G01S7/40; G01S13/9029; G01S13/9058
Inventors
胡文龙; 江冕