Beidou GEO satellite precise timing system and method based on directional antenna

Abstract

The invention discloses a Beidou GEO satellite precise timing system based on a directional antenna, and the system comprises: a data acquisition unit, a data management unit and a data processing unit, wherein the data acquisition unit and the data processing unit are respectively in communication connection with the data management unit; specifically, the data acquisition unit is used for receiving GEO satellite signals by using a directional antenna, and a GNSS receiver acquires observation data after decoding and sends the observation data to the data management unit; the data management unit is used for receiving and storing the observation data; and the data processing unit is used for acquiring the observation data from the data management unit and resolving the clock difference of a receiver clock relative to the time of the Beidou satellite navigation system according to the observation data. The directional antenna is used for observation, so that the signal-to-noise ratio can be improved, the multipath effect and observation noise can be weakened, the code pseudo-range measurement precision is improved, the integer characteristic of carrier phase ambiguity can be recovered, and precise timing based on the Beidou GEO satellite carrier phase observed quantity is realized.

Description

technical field [0001] The invention belongs to the technical field of satellite timing, and in particular relates to a Beidou GEO satellite precision timing system and method based on a directional antenna. Background technique [0002] Time service is one of the basic service functions of BeiDou Navigation Satellite System (BDS). Usually, static timing users use anti-multipath omnidirectional antennas and high-performance GNSS receivers to make observations, so as to receive signals broadcast by all satellites within the visible range and achieve timing. [0003] In the prior art, timing methods mainly include a BDS one-way timing method and a BDS precise single-point positioning timing method. Among them, for the BDS one-way timing method, the user needs to receive more than 4 GNSS satellite signals at the same time, and use code pseudo-range observations, broadcast satellite orbits and clock differences to calculate the receiver clock and the clock relative to the BDS s...

AI Technical Summary

Problems solved by technology

Although the BDS precise single-point positioning timing method can achieve higher-precision timing, it faces the problems that there are obvious discontinuous steps (sky jumps) at the junction of the sky and the sky in the clock error sequence, and it is difficult to fix the carrier phase ambiguity.

[0005] In addition, the above two methods both use anti-multipath omnidirectional antennas for observation. This type of antenna has small gain, limited ability to resist multipath effects, and low code pseudo-range measurement accuracy.

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