Research Of Flexible Composite Electronic Systems For Pico-satellite

Benefiting from the rapid development of microelectronics technology and software tech-nology,micro satellites with low cost,short development cycle,high functional density and strong flexibility,especially the Pico-satellites,have gradually become one of the research hotspots of modern space technology.With the rapid economic development in our country,the government has also increased its support for the aerospace satellite business.As the core system of Pico-satellite,the composite electronic system takes over the functions of the entire satellite control,data acquisition and processing,and the communication data processing be-tween satellite and the earth.In this paper,based on the first applied Pico-satellite in China-ZDPS-2 of Zhejiang University(ZDPS-2),and subsequent missions,the relevant research and implementation of the flexible composite electronic system technology are carried out.The main work and results are listed as follows:First,with the analysis of several satellite missions,the performance of the key interface of the composite electronic system has been improved.The single-page writing time of the memory(Nand-Flash)has been reduced by 20.6%,the drifting time in time correction system has been reduced by 46.1%,and the byte transmission time in telemetry/data transmission sys-tem has been reduced by 86.1%.In the meantime,the on-orbit reconfiguration method based on FPGA is researched,which provides some reference solutions for on-orbit fault diagnosis and updating.Finally,a prototype of flexible composite electronic system has been developed and tested to meet the mission requirements.Second,aiming at the multi-processor matrix + FPGA system architecture,this article dis-cusses the composite electronic system's reliability,performance and energy consumption,and the three correlation analysis.Through the modeling and practical analysis,the processor ma-trix working modes switching and task allocation strategy are proposed.And the correctness of the results is verified by examples.In summary,this paper studies the flexible composite electronic system technologies,such as processor matrix working mode switching strategy and the key interface performance,and develops a flexible composite electronic system prototype with the capability of working mode switching and flexible interface adjustment,which can adapt to different application require-ments of different satellite models.