Rubidium clock abnormality diagnosis method based on time-frequency characteristics

Abstract

The invention provides a rubidium clock abnormality diagnosis method based on time-frequency characteristics, which is used for solving the problem that the working state of a rubidium clock is abnormal through telemetry data in the prior art. The rubidium clock abnormality diagnosis method comprises the following steps: S1, extracting typical characteristic values of a telemetering rubidium clocksignal in a time domain and a frequency domain; S2, analyzing the change trend of the typical characteristic values extracted in the period; S3, determining a characteristic value threshold range according to the time-frequency characteristic value under the normal condition; and S4, within the characteristic value threshold range, analyzing the change trend of the time domain characteristic value and the frequency domain characteristic value, and analyzing whether the rubidium clock is abnormal or not according to the change trend. According to the method, diagnosis of rubidium clock abnormity is realized based on time domain and frequency domain characteristic analysis, the rubidium clock abnormity is accurately detected and identified, the working state of the on-board rubidium clock is intelligently evaluated, data support is provided for decision making of a ground control center, and the long-term management capability of the on-board rubidium clock on key parts of an effectiveload of an on-orbit navigation satellite is improved.

Description

Technical field[0001]The invention belongs to the field of satellite navigation, and specifically relates to a rubidium clock abnormality diagnosis method based on time-frequency characteristics.Background technique[0002]Rubidium atomic clock has the characteristics of small size, low quality, low power consumption, and low price. It is widely used in timekeeping for spacecraft. It is a precision clock source for Beidou navigation satellite payloads. Its stability has an important impact on navigation and positioning accuracy. In the Beidou navigation satellite system, the on-board rubidium clock is used as the on-board time reference for navigation signal generation and system ranging. It provides an accurate and stable frequency source for the navigation system. It is the core component of the navigation satellite payload. Its performance and working status It directly determines the user's navigation and positioning accuracy. Therefore, it is necessary to ensure the stable operat...

AI Technical Summary

Problems solved by technology

However, the data volume of satellite telemetry parameters is huge, and the effect of conventional data processing methods is poor; at the same time, most of the telemetry parameters related to the rubidium clock on the satellite change steadily, and it is difficult to directly observe the precursory information of faults from the original data. Diagnostics place greater demands

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