深空星间链路信道建模及硬件模拟器研制

Channel Modeling and Hardware Emulation for Deep Space Inter-satellite Links

针对深空通信信道距离长、信噪比低、链路损耗巨大等特点,提出了太阳闪烁与多径效应影响下的深空星间链路信道理论模型。在此基础上,构建了一个基于硬件现场可编程门阵列和控制计算机的深空星间链路信道模拟器,有效模拟了深空星间通信的多径衰落、传播路径损耗和信道延迟,规避了投入高、风险高、耗时长的实地通信实验。实测结果表明,该深空星间链路模拟器输出的载噪比及误比特率波形与理论结果吻合,可用于实验室条件下对深空星间链路的实时模拟复现。

For the characteristics of deep-space communication,i.e.,long distance,low signal-to-noise ratio(SNR)and huge link loss,an analytical channel model for deep-space inter-satellite links considering the influence of sun flicker and multi-path effect is proposed.On this basis,a deep space inter-satellite link channel emulator based on Field Programmable Gate Array(FPGA)and Personal Computer(PC)is developed,which can effectively simulate the multi-path fading,propagation path loss and channel delay of inter-satellite communication.It also avoids the high cost and risk of field communication experiments.The test results show that the output signal-to-noise ratio and bit error rate(BER)of the proposed deep-space inter-satellite link emulator are in good agreement with the theoretical results.It can be used for real-time simulation and reproduction of the deep-space inter-satellite link under the laboratory conditions.