Calculation and prediction method of satellite clock error based on real-time data stream

Abstract

The invention provides a method for calculating and forecasting satellite clock errors based on real-time data streams, including: performing data preprocessing on the observation data of real-time data streams; The non-difference model and the difference model between epochs use several epoch tropospheric parameter estimates as prior information to conduct preliminary estimates in real time to obtain clock error estimation information; and use broadcast clock error data to obtain reference conditions to constrain the clock error estimation benchmarks , to obtain the recalculated clock difference data; store the recalculated clock difference data and the broadcast clock difference data separately, obtain the real-time calculated clock difference and broadcast clock difference and model parameters, and select and real-time forecast The broadcast clock error corresponding to the clock error detects and eliminates the gross error of the real-time clock error data, and uses a first-order polynomial fitting model to predict the clock error for data without gross error. The invention has the characteristics of faster response speed and higher prediction accuracy.

Description

technical field [0001] The invention belongs to the technical field of satellite applications, and relates to a satellite clock difference solution and forecast method based on real-time data flow. Background technique [0002] The satellite-based augmentation system is mainly used to receive CORS observation station data, generate differential correction information and integrity information through orbit, clock error and ionosphere calculation, upload to the GEO satellite, and broadcast the differential correction number by the satellite to realize user information. Enhancements to positioning accuracy and positioning integrity. The data processing center is mainly used to receive GPS observation data from CORS stations, perform GPS precise orbit determination, precise clock error determination, and regional ionosphere modeling in real time, and generate correction numbers and integrity information, and send the information to the ground uplink station to complete Operati...

AI Technical Summary

Problems solved by technology

[0005] Due to the influence of the performance of the satellite clock itself or the external environment, satellite clocks often produce gross errors, data interruptions, and phase jumps.

Especially in the real-time clock difference calculation, the change of the reference clock or the lack of data of the reference station may cause the jump of the real-time clock difference

Since the traditional real-time clock difference prediction model using a sliding window is difficult to resist this clock difference anomaly, it is necessary to study the satellite clock difference real-time prediction algorithm taking into account the phase jump

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