High-precision time service method based on communication satellite

Abstract

The invention provides a high-precision time service method based on a communication satellite, and the method comprises the steps that main station equipment transmits a time signal transmitted by amain station clock to the communication satellite, and the communication satellite forwards the time signal to a user observation station and main station equipment after receiving the time signal; the user observation station obtains a clock difference between a local user clock and a main station clock after receiving the time signal; after receiving the time signal, the main station device obtains a clock difference between the satellite clock and the main station clock; the clock difference between the satellite clock and the user clock is calculated by utilizing the clock difference between the satellite clock and the master station clock and the on-satellite virtual clock difference; a pseudo-range observation value from the communication satellite to the user observation station isobtained according to the product of the clock difference between the satellite clock and the user clock and the light speed; a virtual clock correction amount is calculted; the time difference between the user clock and the reference time is calculated; and the user clock is adjusted to synchronize with the reference time to finish one-time time service. According to the method, the reliability of the time service system can be effectively improved, and the reliability and robustness of the time service system in a complex environment can be improved.

Description

technical field [0001] The invention belongs to the technical field of communication satellites, in particular to a high-precision timing method based on communication satellites. Background technique [0002] High-precision (nanosecond level) time service is related to the lifeline of the national economy and national security, and is at the core of the strategy. According to information provided by the US Department of Homeland Security, of the 16 critical industries identified in Presidential Policy Directive 21, 11 rely on precise timing. The current precision timing system greatly depends on the large-area coverage, high performance, high reliability, and high availability capabilities of the satellite navigation system. The satellite navigation system is vulnerable to environmental shading or electromagnetic interference, and its availability and service capabilities have great uncertainty. sex. The one-way timing based on the satellite navigation system is currently...

AI Technical Summary

Problems solved by technology

However, CAPS needs to rent GEO communication satellites, the equipment is complicated and the economic cost is high

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