A method for real-time measurement of satellite clock bias based on tropospheric prior information constraints

Abstract

The invention relates to a satellite clock error real-time measurement method based on troposphere priori information constraint. The method comprises: obtaining the troposphere priori information ofa previous epoch and troposphere actually measured DOP value of the current epoch, if measurement station data are all continuous, determining the current troposphere priori information as the troposphere priori information of the previous epoch, otherwise forwardly searching for new troposphere parameter prior information to form the troposphere priori information of the previous epoch with the measurement station data without data interruption; searching for the DOP values of the previous N epochs to build a linear chart, forecasting the predicted DOP value of the current epoch, using the predicted DOP value as the DOP value when the ratio is greater than a constraint value, otherwise using the actually measured DOP value as the DOP value; and performing sequential least square calculation on the troposphere priori information of the previous epoch and the DOP value to obtain the real-time satellite clock error. The method controls the troposphere parameter error initialization and controls the jumping of the DOP value, prevents the error from accumulating, improves the accuracy of the clock error solution, avoids the ill-condition of the normal equation, and has more stable troposphere parameter accuracy.

Description

technical field [0001] The invention belongs to the technical field of radio orientation; radio navigation; distance measurement or speed measurement by radio waves; positioning or presence detection by reflection or re-radiation of radio waves; similar devices using other waves, and particularly relates to a troposphere prior information Constrained method for real-time determination of satellite clock bias. Background technique [0002] The clock error is a very important concept in the GNSS positioning system. It directly affects the accuracy of the GNSS positioning system. When the satellite clock error cannot be accurately known, it will affect the normal operation of the overall positioning system. [0003] In the existing technology, the real-time estimation of the satellite clock error is inevitably affected by the tropospheric delay of each station. It is generally believed that the model correction can only correct the influence of the dry component, but cannot acc...

AI Technical Summary

Problems solved by technology

[0003] In the existing technology, the real-time estimation of the satellite clock error is inevitably affected by the tropospheric delay of each station. It is generally believed that the model correction can only correct the influence of the dry component, but cannot accurately correct the delay of the wet component. Part of the impact may even exceed 1 meter, which greatly affects the accuracy of real-time estimation of satellite clock errors, resulting in a decrease in the accuracy of the broadcast SSR correction information, resulting in a decrease in the performance of positioning services

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