Method for improving real-time clock difference calculation precision of satellite-borne GPS receiver

Abstract

The invention provides a method for improving on-orbit real-time clock difference calculation precision of a satellite-borne GPS receiver. The satellite-borne GPS receiver comprises a GPS baseband signal processing module, a communication module and a satellite-borne processor. GPS broadcast ephemeris and observation data are obtained by means of the GPS baseband signal processing module, GPS orbit and clock difference corrections are obtained by means of the communication module, and the GPS orbit and clock difference corrections are input into the satellite-borne processor to achieve phase real-time orbit determination and on-orbit clock difference real-time calculation. According to the method, auxiliary information such as the GPS orbit and clock difference corrections are obtained onorbit, GPS original observation data is output by utilizing GPS baseband signal processing, a real-time orbit determination mode is used on the satellite-borne processor, a real-time centimeter-levelorbit result is obtained at first, and a high-precision receiver clock difference is obtained in real time in a mode of reversely solving the a receiver clock difference by fixing the receiver coordinates, so that the problems of discontinuity and the like caused by low traditional SPP time service precision are solved, and a high-precision receiver clock difference result can still be predicted and output under the condition of insufficient GPS satellites or signal interruption.

Description

technical field [0001] The invention relates to the technical field of satellite navigation and timing service, in particular to a method for improving the accuracy of on-orbit real-time clock difference calculation of a spaceborne GPS receiver. Background technique [0002] At present, most space-borne GPS receivers use quartz clocks as their internal frequency standards, and use the pseudo-range and Doppler observations of each channel obtained by the GPS baseband signal processing module as input, and use the least square principle to perform positioning calculations , get the user's position, velocity and local receiver clock error. Through this traditional pseudo-range standard single point positioning (Single Point Positioning, SPP) algorithm, the user position accuracy is better than 10m, and the receiver clock error accuracy is better than 1us, which can meet the positioning and timing requirements of general satellites. [0003] However, in order to complete corres...

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Problems solved by technology

[0005] Based on the above, the present invention provides a method for improving the accuracy of on-orbit real-time clock difference calculation of the spaceborne GPS receiver. The problem that can be solved is to overcome the low accuracy of traditional SPP timing and the discontinuity of timing

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