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Calculation Method of Accuracy Index of Synthetic Aperture Radar Satellite Flight Direction Velocity Measurement

A technology of synthetic aperture radar and flight direction, applied in the application field of satellite system engineering, can solve the problem of low accuracy and achieve the effect of great practical value

Active Publication Date: 2020-04-17
BEIHANG UNIV
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the satellite orbit velocity measurement accuracy index is obtained by decomposing the index according to the Doppler parameter calculation formula in the imaging processing, and the accuracy of the index calculation is not high due to various factors

Method used

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  • Calculation Method of Accuracy Index of Synthetic Aperture Radar Satellite Flight Direction Velocity Measurement

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Embodiment Construction

[0025] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0026] refer to figure 1 , the synthetic aperture radar satellite flight direction speed measurement accuracy index calculation method provided by the embodiment of the present invention comprises the following steps:

[0027] Step 1: Acquire the SAR echo simulation data, and obtain the SAR satellite initial flight speed V according to the simulation setting conditions of the SAR echo simulation data 0 , height and position of point target;

[0028] Step 2: Take the satellite's initial flight speed V 0 image processing;

[0029] At the satellite's initial flight speed V 0 , performing imaging processing on the synthetic aperture radar echo simulation data to obtain the target image of the first simulation point;

[0030] Step 3: Measure the azimuth resolution ρ 0 ;

[0031] Measure the main lobe 3dB width of the point target impulse res...

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Abstract

The invention discloses a method for calculating a flight direction speed measuring precision index of synthetic aperture radar satellite, wherein the method relates to a synthetic aperture radar system and application technology and belongs to the field of satellite system engineering application. The flight speed measuring precision of the synthetic aperture radar satellite is an important condition for ensuring automatic and stable processing of a high-quality image which satisfies a resolution designing requirement in imaging processing. The reasonably designed flight direction speed measuring precision index of the synthetic aperture radar satellite can supply basis for rail speed measuring precision index designing of the synthetic aperture radar. The influence of speed measuring precision of the synthetic aperture radar to image resolution is evaluated through an SAR imaging effect in different speed measuring precisions and measuring an image direction resolution index with relatively high flight direction speed error. A speed measuring precision index of the synthetic aperture radar satellite can be designed in a relatively better manner.

Description

technical field [0001] The invention relates to the application field of satellite system engineering, in particular to a satellite-borne synthetic aperture radar imaging processing technology. Background technique [0002] Synthetic Aperture Radar (SAR) is an active remote sensing device with a wide coverage area, can work all day and all day, and can obtain high-resolution large-area images. In order to obtain a better image quality index, it is necessary to ensure the realization of its superior index performance in all aspects of data acquisition and imaging processing. [0003] At present, on-orbit SAR satellites, referred to as satellites, only obtain the original echo signals reflected by the ground on the satellites, no matter they adopt the strip imaging mode, scanning imaging mode, or spotlight mode, and then the echo signals are lowered to transmitted to the ground for imaging processing. To ensure high-quality images, it is necessary to ensure that the echo sig...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/90G01S13/60
CPCG01S13/60G01S13/9029G01S13/90
Inventor 王鹏波俞雷李春升张永军
Owner BEIHANG UNIV