Real-time clock difference determining and forecasting method and system for navigation satellite and low orbit satellite

Abstract

The invention discloses a real-time clock difference determining and forecasting method and system for a navigation satellite and a low orbit satellite. The method comprise the following steps that navigation satellite clock difference determining is conducted, real-time clock difference estimation of the navigation satellite is carried out by a slow update thread and fast update thread which usesthe slow update thread to calculate parameters of troposphere and fuzziness; navigation satellite clock difference forecasting is conducted, real-time clock error of the navigation satellite is usedfor forecasting the clock error of the navigation satellite; low orbit satellite clock difference determining is conducted, real-time clock difference of the low orbit satellite is obtained by using an obtained real time orbit, clock difference and navigation satellite clock difference forecasting data; low orbit satellite clock difference forecasting is conducted, real-time clock difference of the low orbit satellite is used for forecasting the clock difference of the low orbit satellite. The system comprises a navigation satellite clock difference determining module, a navigation satellite clock difference forecasting module, low orbit satellite clock difference determining module and a low orbit satellite clock difference forecasting module. Estimation and prediction accuracy of real-time precise clock difference of the high orbit navigation satellite and low orbit satellite are improved.

Description

technical field [0001] The invention relates to the field of satellite navigation, in particular to a method and system for estimating and forecasting satellite precision clock error. Background technique [0002] The real-time precision clock error estimation of GNSS is one of the main research contents of real-time precise positioning. Two important problems need to be solved: one is that the clock error products must achieve sufficient accuracy to support precise positioning applications, and the other is real-time precision positioning. The efficiency of calculating the clock difference must meet the real-time requirements. With the development of satellite orbit determination technology, there is not much difference between the current ultra-fast orbit and post-production products, so the estimation accuracy of real-time clock difference is easier to guarantee. Computational efficiency is currently the bottleneck restricting real-time clock offset estimation. [0003]...

AI Technical Summary

Problems solved by technology

[0002] The real-time precision clock error estimation of GNSS is one of the main research contents of real-time precise positioning. Two important problems need to be solved: one is that the clock error products must achieve sufficient accuracy to support precise positioning applications, and the other is real-time precision positioning. The efficiency of calculating the clock difference must meet the real-time requirements

Current research mainly focuses on the real-time orbit determination of low-orbit satellites, but rarely involves its clock error determination and prediction algorithms

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