High-orbit satellite comprehensive electronic computer system and control method

Abstract

The invention discloses a high-orbit satellite comprehensive electronic computer system and a control method. A fault-tolerant SRAM module is adopted to locally save and restore important data, the storage space of the important data is expanded to 512 KB from 2KB, and the storage cycle is shortened to 4 seconds from 60 seconds. By means of the high-orbit satellite comprehensive electronic computer system and the control method, the spaceborne computer system power supply design is optimized, and by adding an independent fault-tolerant power source, the problem that a CPU system and a fault-tolerant machine switching circuit are supplied with the same power source is solved. By the adoption of the idea of machine switching fault-tolerant circuit one-way design and independent switch-on andswitch-off design, the hidden safety hazards of the design which causes frequent machine switching between a host and a standby unit are avoided. Multi-clock input control logic is adopted, and any path of a CPU minimum system crystal oscillator, a temperature-compensation crystal oscillator, and a precise clock source can be adopted by a spaceborne computer system to achieve time management. A Spacewire bus node module is designed, interconnection of the spaceborne computer system and the satellite Spacewire bus network is achieved, two independent full duplex data interfaces are provided, and the maximum rate of the bus interfaces reaches 200 Mbps.

Description

technical field [0001] The invention relates to a high-orbit satellite integrated electronic computer system and a control method, belonging to the technical field of high-orbit satellite platform onboard computer products. Background technique [0002] The high-orbit satellite integrated electronic computer system is the control core of the satellite platform service system. The computer system uses its own hardware and software resources to complete star management, attitude control management, energy management, thermal control management, time management, fault detection and recovery and Isolation and other important functions, the normal operation of the integrated electronic computer system often determines the success or failure of the entire satellite mission. During flight missions, satellites are exposed to complex space environments and have to operate for a long time without supervision and maintenance, which puts forward higher requirements for the function / perf...

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Problems solved by technology

However, the above method will occupy too much bandwidth of the 1553B bus, and the cycle of important data storage is relatively large (about 60 seconds / time), and the capacity of important data storage is also greatly limited, generally no more than 2KB, which cannot meet the current requirements of the on-board computer system. At the same time, the important data storage and recovery of the on-board computer system needs to rely on the communication function of the 1553B bus. If the 1553B bus is in orbit abnormally or the work is unstable, the important data storage and recovery function of the on-board computer system will fail;

[0005] 2. Insufficient reliability design of the fault-tolerant cut-off circuit of the on-board computer system

For example, the satellite-borne computer system only realizes the accumulation of satellite time through software timers, or realizes the accumulation of satellite time only through hardware counters and ordinary crystal oscillators. The above-mentioned time management method is single, and satellite time based on multiple clock sources cannot be realized. Management, if the on-board computer system fails to obtain the satellite time step in the current satellite time management mode, it will lead to the loss of the satellite time management function;

[0007] 4. The on-board computer system does not have the capability of data communication with the Spacewire bus network, and cannot play the role of the core node of the Spacewire bus network

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