Method for carrying out short arc orbit refinement by using GEOSAR phase calibration information

A calibration and phase technology, which is applied in the direction of using re-radiation, reflection/re-radiation of radio waves, measurement devices, etc. Orbital data accuracy, rational use, and the effect of improving accuracy

Active Publication Date: 2016-05-25
INST OF ELECTRONICS CHINESE ACAD OF SCI
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Problems solved by technology

[0009] The purpose of the present invention is to provide a method for refining short-arc orbits using GEOSAR phase calibration information, and to improve the orbit accuracy during GEOSAR imaging work in a targeted manner,

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  • Method for carrying out short arc orbit refinement by using GEOSAR phase calibration information
  • Method for carrying out short arc orbit refinement by using GEOSAR phase calibration information
  • Method for carrying out short arc orbit refinement by using GEOSAR phase calibration information

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[0022] The specific implementation of the present invention will be described below in conjunction with the accompanying drawings. The application scenarios of the method for refining short-arc orbits using GEOSAR phase calibration information in the present invention are as follows: figure 1 shown. Such as figure 2 As shown, the embodiment of the present invention provides a method for using the phase calibration information of the geosynchronous orbit synthetic aperture radar phase calibration system to refine the short-arc orbit, and the specific implementation process is as follows:

[0023] The first step is to obtain the phase calibration information during the imaging work through the GEOSAR phase calibration system.

[0024] This step further comprises the steps of:

[0025] 1) During the working period when the GEOSAR spaceborne radar transmits imaging signals to the ground target area, the spaceborne calibration device synchronously transmits the linear frequency...

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Abstract

The present invention relates to the technical field of spaceborne synthetic aperture radar signal processing and provides a method for carrying out short arc orbit refinement by using GEOSAR (Geosynchronous Synthetic Aperture Radar) phase calibration information. The method comprises the steps of (1) obtaining the phase calibration information in an image working period through a GEOSAR phase calibration system, (2) establishing the orbit refinement problem model comprising a nonlinear motion model and a nonlinear observation model by utilizing the phase calibration information by using an earth-centered earth-fixed coordinate system and a satellite body coordinate system, and (3) using a cubature Kalman filtering method to carry out the short arc orbit refinement of the imaging working period. According to the method provided by the invention, the phase calibration information is utilized rationally, and the orbit accuracy of the GEOSAR during the imaging working period is improved in a targeted way.

Description

technical field [0001] The invention belongs to the technical field of space-borne synthetic aperture radar signal processing, and in particular relates to a method for refining short-arc orbits by using GEOSAR phase calibration information. Background technique [0002] Geosynchronous orbit SAR (Geosynchronous Synthetic Aperture Radar, GEOSAR) is a new system of spaceborne SAR, compared with airborne SAR and low orbit SAR, it has many advantages and can meet the needs of my country's national economy and military development. However, GEOSAR's ultra-high orbit and ultra-long synthetic aperture time also bring particularities different from traditional low-orbit SAR. SAR imaging signal processing faces many new problems. One of the key issues is: the orbit determination accuracy of current high-orbit satellites It cannot meet the long synthetic aperture imaging requirements of GEOSAR, and it is difficult to improve the accuracy of orbit determination. At present, high-preci...

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Application Information

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IPC IPC(8): G01S13/90G01S7/40
CPCG01S7/40G01S13/90G01S13/9058
Inventor 江冕胡文龙黄丽佳丁赤飚
Owner INST OF ELECTRONICS CHINESE ACAD OF SCI
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