Resistance coefficient adaptive modulation method based on precise ephemeris

Abstract

The present invention provides a resistance coefficient adaptive modulation method based on precise ephemeris. Measurement data of a measurement station and a high-precision dynamical model are combined to optimize and correct a resistance modulation coefficient of TLE data, correlation of equal-height satellite correction is analyzed in a space environmental change condition, correlation of the TLE data of the equal-height satellite in the same day and the precise ephemeris is employed to design an orbit prediction algorithm for correction of a TLE+SGP4 model when the satellite is difficult to obtain enough outer measurement data and improve the TLE short-term prediction precision in a space environmental dramatic change period. The resistance coefficient adaptive modulation method basedon precise ephemeris can achieve adaptive modulation of abnormal satellite resistance coefficients, is high in adaptability and improves the prediction precision.

Description

technical field [0001] The invention belongs to the field of aerospace measurement and control, and is suitable for improving the orbit prediction accuracy of my country's low-orbit satellites in the abnormal space environment. Background technique [0002] The orbit prediction of my country's LEO satellites generally adopts two methods based on precise ephemeris and network data (TLE data). When the satellite is normal, the method based on precise ephemeris can meet the needs of satellite daily tracking. However, when the satellite is abnormal due to no available tracking measurement data, and the extrapolation time exceeds a certain time range, the method based on the precise ephemeris will be difficult to meet the tracking accuracy requirements, and the method based on TLE two-line radicals is usually used for orbit prediction . For low-orbit satellites, the atmospheric drag directly related to atmospheric density is an important source of error in orbit forecasting. Th...

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Problems solved by technology

The existing drag coefficient optimization algorithms generally use the precise ephemeris of the satellite to be solved for the drag coefficient in the calm period of the space environment to solve the atmospheric drag coefficient of multiple arcs, which is poor in adaptability to the space environment. And when the space environment changes violently and the satellite has no measurement data anomalies, resulting in no precise ephemeris, this method cannot solve the drag coefficient

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