| In recent years, the CubeSat got rapidly development because of its small volume,light weight,short development cycle and its flexible launch.The communication system is one of the core system in the CubeSat,and its power consumption and sensitivity is an improtant factor of restrictingthe communication performance.So the study of the communication of the CubeSat has important practical significance.This paper mainly studies a full duplex CubeSat communication system with low power consumption and high sensitivity.Firstly,the satellite communicaiton link is analyzed and calculated to determine the reliability of the CubeSat communicaiton link,and then determine the design scheme of the CubeSat communicaiton system.Secondly,the current CubeSats worked on the amateur radio band and easily affacted by the Doppler effect and ground noise and so on.In this paper,a high sensitivity receiver of CubeSat scheme design wih superheterodyne structure and high sensitivity chip which can work on full deplex communicaiton mode is adopted.Also according to the requirement of the NJUST-1 mission,a BPSK/CW dual-mode transmitter which can switch reliably is designed.Thirdly,according to the power limitation of the CubeSat,the CubeSat communication system needs to reduce the system power consumption as much as possible.In this paper,a low power consumption communication system is designed which based the DC/DC conversion and LDO linear voltage stabilized circuit,and the modulation and demodulation of the signal with low power consumption is also designed, which can effectively reduce the power consumption of the CubeSat communication system, and the system power consumption can meet the demand of the system.Finally, the performance of the communicaiton system is verified by satellite communication system test, Satellite-Ground Station communicaiton test and actual in-orbit test. The results show that the design of communication system in this paper can meet the design requirements. |
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