An independent time system method for high-orbit remote sensing satellites

Abstract

The invention provides a high-altitude remote sensing satellite independent clock system method. The high-altitude remote sensing satellite independent clock system method comprises a clock source, atiming device, a remote-measuring device, a CPU, a ground measurement and control device and a GNSS receiver. The clock source provides two frequency sources which carry out timing respectively employing the microsecond grade and the second grade, and provides configurable recurrent pulses aiming at different clock demands on the satellite, cooperates with clock code words to complete timing tasks, and supports self-checking on the satellite, checking on the ground, checking through the CPU and direct checking on the ground without the CPU. According to the invention, real-time, stable and reliable control of the satellite clock system is achieved, and the safety of a checking channel is guaranteed. The problem that the satellite clock system cannot provide timing services flexibly and accurately is solved, the problem that the whole satellite clock system cannot be maintained due to CPU faults is solved, and the fact the satellite clock works in high precision and reliability is achieved.

Description

technical field [0001] The invention relates to an independent time-collection method for high-orbit remote sensing satellites. Background technique [0002] Satellite time system is an important parameter for various tasks such as attitude control, platform maintenance, and remote sensing business during the satellite’s in-orbit operation, and it places high requirements on the reliability, security and flexibility of the time system solution. [0003] Several problems exist in the current satellite clock system: [0004] 1) It is deeply coupled with the CPU system. The CPU timer is also an important part of the clock system. If the CPU fails or the CPU timer fails, the clock system will not work properly; [0005] 2) An independent high-stable crystal oscillator is often used, but the high-stable crystal oscillator has a stop-vibration failure mode. Once a failure occurs, the clock system must rely on the CPU timer to work, which will be more affected by the CPU system; ...

AI Technical Summary

Problems solved by technology

It solves the problem that the timing service provided by the satellite time statistics is not flexible enough and the accuracy is not high, and solves the problem that the entire satellite time system cannot be maintained due to CPU failure, so as to realize the high-precision and high-reliability work of the satellite clock

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