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量子科学卫星有效载荷激光链路需要有一条上下行射频高速通信链路作为激光链路的量子秘钥分发途径.构建了量子科学卫星上下行射频链路的物理层硬件和算法,该链路采用符合CCSDS频谱规范的SRRCOQPSK作为上行调制类型,上行速率达到1.024 Mbit·s~(-1),下行采用SRRC-OQPSK和GMSK调制,速率达到4 Mbit·s~(-1).经过与多个地面站的对接试验测试,结果表明数传通信机的载波捕获灵敏度优于-100 dBm,数据解调灵敏度优于-98 dBm,AGC(自动增益控制)能力大于43 dB,在-96 dBm接收信号电平条件下的实际传输误码率优于1×10~(-9).在轨试验验证证明,射频信道物理层设计方案满足量子科学实验任务要求.
Quantum science satellite payload laser link requires an uplink and downlink RF high-speed communication link as the quantum key distribution channel for the laser link.A physical layer hardware and algorithm of the uplink and downlink RF link of the quantum science satellite is constructed, The SRRCOQPSK conforms to the CCSDS spectrum specification as the uplink modulation type, and the uplink rate reaches 1.024 Mbit · s -1. The downlink uses SRRC-OQPSK and GMSK modulation at a rate of 4 Mbit · s -1. Station docking test results show that the digital communication communication carrier carrier capture sensitivity is better than -100 dBm, data demodulation sensitivity better than -98 dBm, AGC (automatic gain control) greater than 43 dB, at -96 dBm receive signal power The actual bit error rate under the flat condition is better than 1 × 10 ~ (-9) .The in-orbit test verification proves that the physical layer design of RF channel meets the requirements of quantum science experiment.