A high-precision time transfer method based on gnss

Abstract

The invention relates to a high-precision time transfer method based on GNSS. The method performs common-view star selection and data preprocessing on the observation values ​​between base stations of a GNSS differential system, and obtains an observation matrix by combining the carrier phase observation value and the pseudo-range observation value to obtain the observation matrix. The carrier phase single-difference ambiguity and the time transfer result are used as unknowns to form the observation equation system. The ambiguity of the single-difference carrier of the combined equation is obtained recursively using sequential least squares, and then the accurate clock error is solved. Furthermore, when it is known that the receiver clock model has a linear drift, the corresponding unknowns are solved by means of Kalman filtering, the model is more accurate, and the obtained clock error precision is also higher. The method can simultaneously meet the requirements of low cost and high precision, and can achieve the precision below nanosecond level, and is a time transfer method that can be widely used.

Description

technical field [0001] The invention belongs to the technical field of time synchronization, and in particular relates to a high-precision time transfer method based on GNSS. Background technique [0002] At present, the requirements for high-precision time and frequency transmission are increasing in many fields, such as power systems, wireless positioning systems, distributed radars, collaborative data links, and naval ship formations. In these systems, in addition to the high requirements for the accuracy of time transfer, there are also high requirements for the reliability and adaptability of equipment in military, aerospace and other fields. The all-weather, full coverage, and high-precision characteristics of the Global Navigation Satellite System (GNSS) make it an important method for high-precision time transfer. [0003] At present, the commonly used time transfer methods include satellite two-way time transfer, satellite common view method, precise single-point p...

AI Technical Summary

Problems solved by technology

However, this method relies on precise ephemeris and clock error products, requires long-term observation, cannot be calculated in real time, and can only be used for post-event analysis

These time transfer methods have more or less shortcomings such as complex algorithms, high cost, limited usage scenarios, and poor real-time performance, and cannot take into account low cost, real-time performance and high precision.

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