Method for calibrating satellite system clock based on bus mode

Abstract

The invention discloses a method for calibrating a satellite system clock based on a bus mode. In the method,, a low-accuracy clock user is mutually connected with a high-accuracy clock source through a serial data bus, and the clock is calibrated by the following steps of: 1) generating a local system clock parameter TL and transmitting the parameter to the high-accuracy clock source by the low-accuracy clock user; 2) receiving the clock parameter TL and simultaneously generating a real-time clock parameter TH of the clock source by the high-accuracy clock source, subtracting the two parameters to acquire time difference data Delta Tlast, and correcting fixed time delay to acquire time difference data Delta Tlast; 3) acquiring the time difference data Delta Tlast and adding the time difference data Delta Tlast to a system clock of the low-accuracy clock user by the low-accuracy clock user; and 4) repeating the steps 1), 2) and 3) according to certain period intervals. The method has the advantages of reducing a hardware pulse circuit and simplifying an interface between single satellites.

Description

technical field [0001] The invention relates to a method for calibrating a satellite system clock based on a bus. Background technique [0002] The previous satellites usually adopt a centralized architecture, and the connections between them are connected by hardware data lines. The clock time calibration must also be realized by using a hardware second pulse interface circuit. Therefore, a certain amount of hardware expenditure is required. With the increasing complexity of satellite functions, the increase in scale, and the increase in equipment and instruments on the satellite, the star communication method centered on a certain system is increasingly unsuitable for satellite development needs. control. The benefits brought by the communication of the bus structure are: simplifying various communication interfaces to one, the content of communication information can be customized, and has good electrical characteristics and fault detection and isolation. [0003] Many ...

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Problems solved by technology

[0005] At present, there is no description or report of the similar technology of the present invention, and no similar data at home and abroad have been collected yet.

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