GNSS time service performance evaluation method

Abstract

The invention provides a GNSS time service performance evaluation method, a GNSS timing receiver is placed in the national time service center, and the satellite broadcasting UTC time is obtained by correcting the pseudo-range output by a receiver through a source tracing model, a satellite clock model, transmitting channel deviation and the receiving end delay or other parameters; meanwhile, theUTC-UTC (NTSC) data which is published by the BIPM T bulletin is utilized to obtain the actual UTC time. The time service error is obtained by the user by comparing the time difference of the satellite broadcasting UTC time and the actual UTC time. According to the method, the time service performance of the single satellite can be evaluated, and the time service performance of the whole satellitestation can be evaluated, so that the systems have comparability, and compatibility and interoperation between the satellite navigation time service systems are supported.

Description

technical field [0001] The invention relates to a method for evaluating the timing performance of a global satellite navigation system (GNSS), in particular establishing a unified timing evaluation criterion and a performance characterization system for different navigation systems. Background technique [0002] The satellite timing system includes GPS, GLONASS, GALILEO and Beidou. The GPS timing performance stipulates that the GPS time is traceable to the coordinated universal time (UTC (USNO)) maintained by the US Naval Observatory, and the accuracy is better than 90ns (1σ); the GLONASS timing performance stipulates that the GLONASS time traceability As far as the Coordinated Universal Time (UTC(SU)) maintained by the Russian Institute of Time and Space Metrology, the accuracy is better than 1μs (99.7%); the information about Galileo is not clear, and some data show that Galileo time is jointly maintained by a European laboratory UTC(k) is the time reference, the deviation...

AI Technical Summary

Problems solved by technology

The time references of the above timing systems can be traced to UTC(k) or UTC. At the same time, the performance characterization includes mean square error, 1σ, 2σ, 99.7%, etc. The inconsistent characterization methods make the timing systems relatively independent and lack Uniform evaluation criteria, unable to establish effective linkages

[0003] At present, there are no reference standards and patents for evaluating GNSS timing performance in China. There are only suggestions issued by some organizations. These suggestions lack authority, the published data are not comparable, and there is still no unified evaluation standard for timing performance.

There are also differences in the way indicators are represented. In the official documents issued by various authoritative organizations, there is no clear definition of how to represent the timing indicators, such as stability, accuracy, uncertainty, deviation, etc. The expressions of various parameters are not clear enough. There are large differences between them, and even the indicators of the same timing system are not consistent, which brings a lot of inconvenience to the user's use and experience

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