Analysis And Design Of LoRa-based Micro-nano Satellite Ground-to-ground Measurement And Control Communication Syste

At present,the commonly used micro-nano satellite TT & C communication system has the disadvantages of high power consumption,large size and high cost.In this paper,according to the limitation of micro-nano satellite weight and energy,a design scheme of micro-nano satellite TT & C communication system based on LoRa technology is proposed,which includes a low-power TT & C transceiver and a miniaturized low-profile TT & C antenna,which can realize satellite-to-ground TT & C communication with high reception sensitivity and low power consumption.The characteristics and advantages of LoRa communication technology are introduced.The development of LoRa band antenna technology and the application of LoRa communication technology in space at home and abroad are summarized.The system design of TT & C communication transceiver based on LoRa is proposed.Firstly,the key influencing factors in the communication link are simulated,and the link margin is analyzed,and then the communication system design parameters based on LoRa technology are put forward.Finally,the scheme analysis and design of communication module,data processing module,power amplification module and related control module are completed.A design scheme of miniaturized low-profile antenna in LoRa band is proposed,and the layout of the antenna is optimized by genetic algorithm.Firstly,the radiation field characteristics of the current element of the monopole antenna are deduced theoretically,then the electromagnetic field is analyzed by the finite integration technique,and then the design and simulation optimization of the low profile antenna are completed based on the antenna miniaturization technology.Finally,the layout optimization task is completed according to the position of the antenna.The development of TT&C communication machine and its antenna engineering prototype is completed.The transmission power,receiving sensitivity,data transceiver and power consumption of the engineering prototype are tested,and the reliability test of the engineering prototype is completed with the satellite to verify the ability of the engineering prototype to work in the space.