Method and system for determining time reference and medium

Abstract

The invention provides a method and a system for determining time reference and a medium. The method does not take a free paper surface as a basis for determining the time reference, and specificallycomprises the following steps: S1, obtaining a time difference between a first time reference from a punctuality laboratory and an atomic clock surface reading; S2, based on the time difference, for different types of atomic clocks, selecting an optimal observation interval of the frequency difference at each time interval so as to obtain a first time scale synchronous with the first time reference through prediction; S3, determining a second time scale which is synchronous with the first time reference and has a deviation lower than a first threshold value based on the first time scale by using a control algorithm; and S4, allocating a weight to the second time scale to determine a second time reference for the global navigation satellite system.

Description

technical field [0001] The present invention relates to the field of signal processing, in particular to a method, system and medium for determining a time reference. Background technique [0002] 1. Establish a time base [0003] Coordinated Universal Time (UTC) is an international time reference, calculated by the International Bureau of Weights and Measures and published once a month. Both the punctuality laboratory and the global navigation satellite system (GNSS) need to establish a time reference. The time base of the punctual laboratory is recorded as UTC(k), where k is the laboratory code. For example, the Chinese National Time Service Center (NTSC) establishes and maintains UTC (NTSC); the United States Naval Observatory (USNO) establishes and maintains UTC (USNO). According to the requirements of the International Telecommunication Union (ITU), the deviation of [UTC-UTC(k)] should be kept within 100 nanoseconds. The time reference of GNSS is recorded as GNSST (...

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Problems solved by technology

[0027] (3) In the time scale algorithm, the prediction intervals of the predicted values ​​of each clock are consistent, but in fact this is not an optimal method

[0028] (4) For distributed timekeeping or satellite-ground joint timekeeping, due to reasons such as the invisibility of some spaceborne clocks, the interruption of comparison links, and the failure of some atomic clocks, the number of atomic clocks involved in TA calculations changes, which in turn leads to the deterioration of TA noise performance. Change

like figure 2 As shown, since the structure, bandwidth, and parameters of the steering algorithm need to be optimized according to the performance of the TA, it is not easy to redesign or adaptively adjust the steering algorithm according to the actual situation.

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