COTS星载双模测控应答机基带设计与实现

Design and Implementation of Dual-Mode Satellite TT&C Transponder Baseband System with COTS Components

提出了一种星载双模测控应答机基带设计方案,采用COTS（商用现货）器件实现,能较好解决星载功率受限和空间辐射效应引起的相关问题。测控应答机主处理器由反熔丝FPGA（现场可编程门阵列）实现,可在低功耗条件下保证最基本测控需求,解调上行DPSK（差分相移键控）信号,调制下行扩频信号;协处理器受主处理器控制,由SRAM（静态存储器）FPGA来实现,对上行扩频信号进行解扩解调。测控应答机可根据星载电源功率情况和不同测控任务切换模式,具有成本低、可靠性高、使用灵活等优势。

This paper presents a design of dual-mode satellite TTC transponder baseband system implemented with commercial off-the-shelf components to provide solutions to limited onboard power and space radiation effects.The primary processor of the TTC transponder,an anti-fuse FPGA,demodulates uplink DPSK signals and modulates downlink spread spectrum signals to meet basic TTC requirements at low power consumption.The coprocessor,which is controlled by the primary processor,is an SRAM FPGA serving as a demodulator for the uplink spread spectrum signals.The TTC transponder switches its operation mode based on available power onboard and TTC tasks and it has the advantages of low cost,high reliability and flexibility.