Real time precision rail fixing method of navigational satellite

Abstract

The invention discloses a method for precisely determining an orbit of a navigational satellite in real time based on a sliding data window. The main concept of the method is that when an estimation is carried out on a state Xk including an initial state of the satellite, a force model parameter, an earth rotation parameter, an atmospheric parameter, a station coordinate and the like; only first N measurements which are closest to k moment are utilized, while other measurements are completely abandoned, wherein N is a predetermined length of the sliding window; a precise satellite orbit initial value and the precise force model parameter of the Nth segmental arc can be acquired through establishing, combining, solving a normal equation and other steps; and a predicted orbit of the next moment can be acquired through an orbit integral and taken as a real-time orbit to be transmitted to a user. The method for determining the orbit of the satellite has the advantages of high speed of data processing, high orbit precision, stable numerical value and the like.

Description

technical field [0001] The invention relates to a satellite navigation technology, in particular to a method for precise orbit determination of a navigation satellite in real time. Background technique [0002] As a key technology of satellite navigation system, precise orbit determination of navigation satellites has been paid attention by many research institutions at home and abroad, and has become a frontier topic in related research fields. Since the establishment of the International GNSS Geodynamics Service Organization in 1994, precision GPS orbit and clock error products have been continuously improved in terms of accuracy and time delay. At present, the post-event precise ephemeris track accuracy provided by IGS is better than 5cm, and the clock error accuracy is better than 0.1ns, which can meet the post-event positioning needs of high-precision users. With the extensive and in-depth application of precise point positioning technology, more and more GPS users hav...

AI Technical Summary

Problems solved by technology

This problem is very prominent in real-time orbit determination, because the initialization observation time is greater than 12 hours, and the time required for initialization is at least equal to the calculation time for processing 12 hours of data

At the same time, robust real-time data quality control in filtering is a very difficult problem, and the resulting filtering divergence will cause the estimation system to crash, and the system needs to be re-initialized

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