深空通信Ka频段数传发射机基带电路单元实现

基于Xilinx FPGA电路的全数字化设计方案，研制完成适用于深空通信下行链路Ka频 段发射机中基带数据编码调制一体化电路单元。参照CCSDS（Consultative Committee for Space Data Systems）相关深空通信建议标准，电路单元实现了按码速率的变化灵活选择调 制方式的工作模式，利用外部控制指令，完成码速率16 bit/s～20 kbit/s、20～ 200 kbit/s、200 kbit/s～2 Mbit/s分段分别选择PCM/BPSK/PM、N RZ/BPSK和SRRC-QPSK数据调制方式 。在X频段的测试结果表明，BPSK和SRRC-QPSK幅度误差和相位不平衡分别小于3.1%和1.7° ，符合CCSDS关于深空通信的建议标准。电路单元满足深空通信工程应用需求。

Development of digital baseband circuit unit of a Ka band data transmission transmitter for deep-space communications

The baseband data coding and modulation is achieved on the Xilinx FPGA circuit,which is a part of a Ka band downlink transmitter for deep space communications.The flexible design of modulation mode corresponding to the different transmission rate ranges referred to CCSDS(Consultative Committee for Space Data Systems) standard is finished.The modulation schemes of PCM/BPSK/PM,NRZ / BPSK and SRRC-QPSK are separately chosen corresponding to the code rate ranges of 16 bit/s～20 kbit/s,20～200 kbit/s and 200 kbit/s～2 Mbit/s by the external control commands in the FPGA circuit.The test results at X band show that the magnitude and phase error of BPSK and SRRC-QPSK are respectively less than 3.1% and 1.7 degrees,which comply with the CCSDS recommend on deep space communication standard.The circuit can meet the application requirement of the Deep Space Communication engineering.