Satellite clock error resolving and forecasting method based on real-time data flow

Abstract

The invention provides a satellite clock error resolving and forecasting method based on real-time data flow. The satellite clock error resolving and forecasting method based on real-time data flow comprises the following steps: preprocessing observation data of the real-time data flow; establishing a non-difference model and an inter-epoch difference model according to pseudorange, carrier wave and phase smooth pseudorange observation value after data preprocessing, taking a plurality of epoch convection zone parameter estimations as prior information, and carrying out initial estimation in real time to obtain clock error estimation information; acquiring a reference condition by using broadcasted clock error data, and restraining a clock error estimated reference to obtain resolved clockerror data; and separately storing the read resolved clock error data and the broadcasted clock error data to obtain real-time resolving clock error, a broadcasted clock error and a model parameter,selecting the broadcasted error which corresponds to the real-time forecasted clock error, detecting and rejecting gross errors of the real-time clock error data, and carrying out clock error forecasting on data without gross errors by using a linear polynomial fitting model. The satellite clock error resolving and forecasting method based on real-time data flow has the characteristics of high response speed and high forecasting precision.

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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