Relative Orbit Determination Method for Formation Satellites Ease of On-orbit Real-time Processing

Abstract

The invention discloses a method for relative orbit determination of formation satellites, which is easy to be processed on-orbit and in real time, and belongs to the field of satellite formation relative navigation. The method uses GPS / BDS broadcast ephemeris and a simplified relative dynamics model to determine formation satellite GPS / The BDS dual-frequency observation data is processed in real-time on-orbit. Considering the limited computing resources of the on-board processor, the operation mode of dynamic orbit prediction and orbit interpolation is designed, and the core complex data processing process is realized by time-sharing and multi-step to reduce the single The calculation of the epoch is time-consuming, and the high-precision absolute and relative orbit results of the formation satellites with adjustable frequency can be output. The present invention is not only suitable for inter-satellite formations with a relatively large inter-satellite distance range, but also can continuously output relatively smooth navigation results that meet certain precision requirements when GPS / BDS signals are interrupted, and has high orbit determination accuracy, good stability and It has low requirements on the performance of the on-board processor and is easy to implement in engineering.

Description

technical field [0001] The invention belongs to the technical field of satellite formation relative navigation, and more particularly relates to a GPS / BDS relative orbit determination method for formation satellites that is easy to process on-orbit and in real time. Background technique [0002] Satellite formation flight is a very hot research field in the aerospace industry at home and abroad in recent years. It has been widely used in scientific tasks such as distributed radar interferometry, time-varying earth's gravity field measurement, marine environment monitoring, and aerospace military reconnaissance. It is a representative application Including foreign GRACE-A / B, TerraSAR / TanDEM, SWARM-A / B / C and domestic practice No. 9 A / B, Exploration No. 4 A / B, Environment No. 1 A / B / C, etc. [0003] The determination of high-precision absolute orbits and relative baselines of satellites and their formation satellites is the key to completing the flight mission of formation satel...

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Problems solved by technology

[0005] Aiming at the above defects or improvement needs of the prior art, the present invention proposes a GPS / BDS relative orbit determination method for formation satellites that is easy to be processed on-orbit and real-time on-orbit, thereby solving the problem of existing satellites that are suitable for practical application of on-orbit engineering. The technical problem that the relative orbit determination method of real-time formation satellites cannot take into account both high precision and real-time performance

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