A method for calibrating GNSS-based tracking and sighting measurement error on orbit

CN115877413BActive Publication Date: 2026-05-12SHANGHAI AEROSPACE CONTROL TECH INST
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SHANGHAI AEROSPACE CONTROL TECH INST
Filing Date
2022-12-28
Publication Date
2026-05-12

AI Technical Summary

Technical Problem

The onboard tracking sensor suffers measurement errors during launch and in-orbit due to factors such as mechanical shock and temperature changes, making it difficult to meet the high-precision measurement requirements of close-range dual-satellite missions.

Method used

By employing GNSS differential calculation and attitude transformation matrix, and combining GNSS measurements and attitude information of the tracking and target satellites, the line-of-sight angle and relative distance deviation of the tracking radar are calibrated, and compensation and correction are performed by fitting the solar angle within the orbital plane.

Benefits of technology

It improved the accuracy of on-orbit measurements by the tracking radar, meeting the high-precision relative measurement requirements of close-range dual-satellite escort missions.

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Abstract

The application discloses a kind of on-orbit calibration methods of follow sight measurement error based on GNSS, relative position relationship between two stars is calculated by using double star GNSS differential data, and this is used as the reference value of follow sight measurement calibration, the measurement error of spaceborne follow sight radar is obtained by calculation, and the corresponding relationship between the measurement error of spaceborne follow sight radar and the position of the sun is obtained by further fitting, for ground number correction compensation.The application reduces the influence of follow sight radar measurement system error, improves the precision of follow sight radar on-orbit measurement, and can meet the high-precision relative measurement requirements of close-range double-star companion flying task.
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