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Radar SAR imaging positioning error elimination method

A positioning error and imaging technology, which is applied in the field of elimination of positioning error sources of airborne equipment, can solve the problems of the aircraft's own sensor error and the influence of the radar

Active Publication Date: 2020-04-14
XIAN AIRCRAFT DESIGN INST OF AVIATION IND OF CHINA
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  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, during the domestic aircraft test flight assessment, the radar SAR mode is easy to introduce errors caused by the aircraft's own sensors during the ground imaging and positioning process, resulting in the inability to directly obtain positioning error data that does not include the carrier aircraft platform, which seriously affects the radar flight test assessment. Judgment of conclusion

Method used

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  • Radar SAR imaging positioning error elimination method

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Embodiment Construction

[0025] By analyzing the radar SAR imaging process, the present invention systematically considers the error sources in the entire SAR imaging process, and obtains that the analysis of the influencing factors of the SAR positioning error mainly includes imaging algorithm, inertial navigation data (attitude, speed, position, etc.), aircraft height, data The errors introduced by the transmission delay can obtain the positioning accuracy without the influence of the carrier aircraft.

[0026] Such as figure 2 As shown, this method proposes an error elimination method through system analysis, which better solves the problem of positioning error elimination in radar SAR imaging mode, and provides a set of theoretical basis for flight test evaluation.

[0027] The specific real-time steps are as follows:

[0028] Step 1: Obtain data sources such as attitude, speed, position, and altitude;

[0029] Step 2: Measure and obtain the aircraft data transmission delay time in the laborato...

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Abstract

The application provides a radar SAR imaging positioning error elimination method. The method comprises the steps: acquiring aircraft data source precision; measuring transmission delay time T of theaircraft data on the aircraft; according to the aircraft data source precision and the transmission delay time, respectively calculating SAR imaging positioning errors caused by main error influence factors; and according to the SAR imaging positioning error, calculating a total radar SAR positioning precision error by utilizing an SAR imaging positioning error calculation formula.

Description

technical field [0001] The invention belongs to the field of elimination of positioning error sources of airborne equipment, and in particular relates to a radar SAR imaging positioning error elimination method. Background technique [0002] At present, during the domestic aircraft test flight assessment, the radar SAR mode is easy to introduce errors caused by the aircraft's own sensors during the ground imaging and positioning process, resulting in the inability to directly obtain positioning error data that does not include the carrier aircraft platform, which seriously affects the radar flight test assessment. judgment of the conclusion. Contents of the invention [0003] The invention belongs to a method for eliminating error sources of airborne equipment, obtains positioning accuracy excluding the influence factors of the airborne aircraft, better solves the problem of radar SAR positioning accuracy evaluation, and relates to research on a method for eliminating airc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/40
CPCG01S7/4004
Inventor 谢鹏尹扬王龙涛王小宁
Owner XIAN AIRCRAFT DESIGN INST OF AVIATION IND OF CHINA