Design Of Microsatellite Oriented On-Board Computer Based On SOC And SIP

Satellite technology has developed rapidly in past few years in China,and the development ability of on-board computers has been continuously improved.For the traditional on-board computer,high quality grade and radiation-harded components are selected,which enhance reliability and adaptability,however,these kinds of components are usually extremely expensive,in the mean time,the volume and power consumption are too large.For example,the on-board computer use by "Wu Kong" satellite cost about 5 million RMB,13 kg in weight,386mmx258mmx195 mm in volume and 13 W in power consumption.For the Micro satellites,we are not able to afford such a price,volume,weight or power consumption.Based on the mission requirements of a micro-nano satellite model,based on SOC and SIP devices,detailed demand analysis is carried out in this paper.On the premise of high reliability and the requirement of miniaturization,high performance,low cost and low power consumption,a dual-machine cold-standby redundant on-board/on-board on-board computer system is designed and implemented.By introducing the reliability and security design in space environment,the satellite-borne computer system lays a foundation for the further research of the micro-nano satellite-borne computer with low cost,low power consumption,miniaturization and high performance.According to the characteristics of the space environment,from the perspective of irradiation,guided by the safety and reliability design,and from the aspects of hardware design and FPGA design,a highly reliable satellite-borne computer system was designed,including hardware design,FPGA design and software design.Hardware design includes clocking circuit and reset circuit,watchdog,processor system,memory organization,CAN bus,such as16 sub modules,the FPGA logic design,functional design and space design including bus independent fault-tolerant design three child module,the software design including system startup,satellite-borne management software,reliability,and safty management module.Based on the key techniques,We realized the space adaptive design of the on-board computer,including radiation resistance reinforcement design,latch-up self-protection release,health monitoring,dual-system reconfiguration,high-reliability command output and high precision time autonomic management.We completed the design verification and the practical application of the on-board computer.Through established a grounded test and validation system,the full coverage test of its functions and performance was achieved,and it also passed various single-card level and system-level environmental tests.The results also showed that each characteristic of the board-level on-board computer product reached the technical and mission requirements of the micro-nano satellite for on-board computers.