Accurate geosynchronous orbit synthetic aperture radar system parameter calculation method

A technology of geosynchronous orbit and synthetic aperture radar, which is applied in the field of microwave remote sensing, can solve the problems of inaccurate imaging processing, deviation, and not fully considering the real-time change of beam angle in the synthetic aperture, etc., to achieve more calculation accuracy and wide application prospects Effect

Inactive Publication Date: 2021-10-22
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

However, the calculation methods of corresponding Doppler parameters (synthetic aperture time, Doppler bandwidth, and azimuth resolution) do not fully consider the real-time changes of beam angles (downward and oblique angles) in the synthetic aperture, and there is a problem with the complex calculation process. There are deviations between such calculation results and real results, which lead to inaccurate system design and imaging processing

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  • Accurate geosynchronous orbit synthetic aperture radar system parameter calculation method
  • Accurate geosynchronous orbit synthetic aperture radar system parameter calculation method
  • Accurate geosynchronous orbit synthetic aperture radar system parameter calculation method

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Embodiment Construction

[0040] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, so as to define the protection scope of the present invention more clearly.

[0041] refer to figure 1 and figure 2 As shown, this embodiment discloses a method for calculating parameters of an accurate geosynchronous orbit synthetic aperture radar system, including the following steps:

[0042] Step S1, obtain the zero-Doppler center through pitch-yaw attitude guidance, and obtain the yaw angle and pitch angle that need to be adjusted.

[0043] In this step, assuming that the radar is looking right, the zero Doppler center is obtained through pitch-yaw attitude guidance, and the yaw angle and pitch angle to be adjusted are:

[0044]

[0045] in, is the yaw angle, θ is the pitch angle, ω e Indicates the angular ve...

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Abstract

The invention discloses an accurate geosynchronous orbit synthetic aperture radar system parameter calculation method, which comprises the following steps: S1, obtaining a zero Doppler center through pitch-yaw attitude guidance, and obtaining a yaw angle and a pitch angle which need to be adjusted; S2, realizing attitude guidance equivalently through an antenna phase center scanning method, and obtaining an adjusted lower visual angle and an adjusted squint angle; and S3, calculating Doppler parameters according to the beam angle changing in real time. According to the method, real-time change of the beam angle in the synthetic aperture is fully considered, accurate calculation of Doppler parameters is completed, and the problem of insufficient accuracy of the Doppler parameters is solved.

Description

technical field [0001] The invention relates to the technical field of microwave remote sensing, and more specifically relates to an accurate method for calculating parameters of a geosynchronous orbit synthetic aperture radar system. Background technique [0002] GEO SAR (Geosynchronous Orbit Synthetic Aperture Radar System) has a very long synthetic aperture time (up to several hours), which can realize long-term observation of the target, and the return period is very short (close to 24 hours), which can realize the In addition, its GEO SAR is not limited by geographical boundary conditions and other advantages that other low-orbit SARs do not have, so it has great application value in both military and civilian applications. [0003] Doppler centering is extremely important in data processing of spaceborne SAR systems, such as interferometry, range migration correction, and azimuth compression. In order to avoid the complex Doppler center estimation process and improve ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90G01S13/50
CPCG01S13/90G01S13/50
Inventor 常法光计一飞李德鑫董臻何志华
Owner NAT UNIV OF DEFENSE TECH
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