Method for calibrating satellite system clock based on bus mode

A calibration method and technology of the system clock, applied in clocks, electronic timers, changing time indications, etc., can solve problems such as uncollected data, no instructions or reports found, and achieve the effect of reducing hardware pulse circuits and simplifying interfaces

Active Publication Date: 2011-06-15
SHANGHAI SATELLITE ENG INST
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[0005] At present, there is no description or report of the similar technology o...

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  • Method for calibrating satellite system clock based on bus mode
  • Method for calibrating satellite system clock based on bus mode
  • Method for calibrating satellite system clock based on bus mode

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Embodiment Construction

[0016] Preferred embodiments of the present invention will be described below in conjunction with the accompanying drawings.

[0017] figure 1 It is a structural schematic diagram of the satellite system clock of the present invention based on bus mode time correction; it includes a high-precision clock source 1 and a low-precision clock user 2 connected to each other through a serial data bus 3, and the low-precision clock user 2 includes bus clock users 2-1~ 2-n and so on for all clock users.

[0018] High-precision clock source 1 is a local clock system with high precision, such as GPS, rubidium clock, cesium clock and other units on the satellite can be used, and the precision is generally better than 10 -9 , much higher than the clock system of other satellite units, as the high-precision time reference of the entire star. The high-precision clock source 1 receives the real-time clock data sent by the low-precision clock user 2 through the bus, and immediately responds ...

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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 ...

Claims

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Application Information

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IPC IPC(8): G04G5/00G04R20/04
Inventor 章生平朱海园朱维刘伟
Owner SHANGHAI SATELLITE ENG INST
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