Abstract:A multifunction-reconfigurable terminal design scheme is proposed, which is suitable for multifunction–reconfigurable satellites. Compared with the conventional solution, the reconfigurable terminal solution uses a reconfigurable antenna unit. Its polarization can be reconfigured on-orbit according to mission requirements; the digital baseband board adopts dual FPGA design, and its function can be dynamically reconfigured on-orbit according to requirements; radio frequency system is optimized, part of the antenna function is integrated into the radio frequency front end. Based on the above three designs, the reconfigurable terminal realizes the on-orbit reconstruction of functions such as antenna polarization, antenna pattern, power distribution, and communication modulation mode. Through reconfiguration, the terminal can support multiple application scenarios such as TT&C, data transmission, electronic reconnaissance, etc. The design of the prototype and the on-orbit reconfiguration process are introduced. Hardware implementation and actual test results are elaborated. Verified by actual tests, antenna polarization can be reconstructed and cross-polarization isolation can reach 19dB; through reconfiguration, the product can support 8kbps low rate mode or 2Mbps high rate mode. It can dynamically distribute transmitted power according to the communication rate, dynamic allocation range up to 3dB or more. The implementation and test results show that the product functions are implemented correctly, the performance is good, the terminal architecture is simple, the system design is flexible, the scalability is strong, and it has strong engineering reference value.
