量子科学实验卫星射频信道物理层设计  

Physical Layer Design of Microwave Communication Link for Quantum Science Experiment Satellite

作　　者：王竹刚[1,2,3] 熊蔚明[2,3] 屈晨阳[1] 陈巧艳[1] 

机构地区：[1]中国科学院大学,北京100190 [2]中国科学院国家空间科学中心,北京100049 [3]中国科学院复杂航天系统电子信息技术重点实验室,北京100190

出　　处：《空间科学学报》2017年第4期490-498,共9页Chinese Journal of Space Science

摘　　要：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.In order to ensure quantum science experiments can be developed smoothly, a high data rate two-way link for Space-Ground microwave communication must be established. By following the study on Consultative Committee for Space Data Systems （CCSDS） and taking into account the scientific requirements of microwave communication link for quantum science experiment satel- lite, the physical layer hardware architecture and modulation/demodulation algorithm of microwave communication link for the satellite are presented. The uplink modulation type of the microwave communication link is SRRC-OQPSK, which is accordance with CCSDS spectrum standard. The specification of uplink data rate is 1.024 Mbit.s-~. The downlink modulation tvoe of the microw~,v^communication link is SRRC-OQPSK/GMSK, and the data rate is 4 Mbit-s-i. By compatible tests with several ground stations, it is found that the sensitivity of carrier acquisition is superior to -100 dBm, and AGC （Automatic Gain Control） ability is greater than 43dB. Moreover, the bit er- rot rate of actual transmission is superior to i x 10-9 as the received signal level is equal to -96 dBm. The in-orbit verification indicates that the physical layer design scheme of microwave communication link meets the requirements of space quantum science experiments.

关 键 词：卫星通信 高速上行链路 平方根升余弦-偏移四相相移键控 高斯频移键控 

分 类 号：V443[航空宇航科学与技术—飞行器设计]