Low-orbit satellite real-time high-precision orbit determination method based on combination of kinematics and dynamics

Abstract

The invention relates to a low-orbit satellite real-time high-precision orbit determination method based on combination of kinematics and dynamics, which comprises the following steps that: firstly, alow-orbit satellite receives a high-precision GNSS (Global Navigation Satellite System) orbit and a high-precision clock error through a feed uplink or an inter-satellite link, and forecasts and processes earth rotation parameter data and solar radiation flux parameter data; then orbit recursion is performed from the moment k by using a high-precision satellite orbit kinetic model in combinationwith a Runge-Kutta method to obtain a position speed at the moment k + 1; cycle slip detection and restoration are carried out on GNSS observation data at the k + 1 moment; an orbital clock error at ak + 1 moment is corrected according to the injected high-precision orbital clock error data product, and errors such as GNSS antenna phase center deviation, low-orbit satellite antenna phase center deviation, GNSS antenna phase center change correction and ionosphere are corrected; finally, Kalman filtering measurement updating is carried out after a k + 1 moment observation matrix and a pseudo code carrier residual matrix are obtained, the filtered position, speed, integer ambiguity, updating state vector and variance matrix are obtained, and calculation of the next epoch is carried out.

Description

technical field [0001] The invention relates to the technical field of orbit determination of low-orbit satellites, in particular to a method for real-time and high-precision orbit determination of low-orbit satellites based on a combination of kinematics and dynamics. Background technique [0002] At present, with the development of aerospace technology, the application fields of low-orbit satellites are becoming wider and wider. Systems such as low-orbit surveying and mapping satellites, low-orbit navigation enhancement satellites, low-orbit gravity measurement satellites, and low-orbit magnetic measurement satellites are gradually developing. The key to the premise is to achieve high-precision orbit determination. [0003] At present, for example, the Ziyuan-3 surveying and mapping satellite uses post-event high-precision orbit determination technology to perform post-event high-precision orbit determination, and then performs load data inversion. The promotion of load ap...

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Problems solved by technology

[0004] In addition, some scholars proposed to use GNSS observation data, use GNSS broadcast messages to calculate the position and clock error of navigation stars, and combine dynamic models for real-time orbit determination. Insufficient accuracy of orbit determination

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