基于二代中继系统的通用化SMA测控终端的设计

Design of Universal SMA Measurement and Control Terminal based on 2G CTDRSS

为了适应二代中继系统的测控体制的需求,设计了一种通用化SMA测控终端。此终端由中频处理模块、射频收发模块、功放模块、双工器、以及二次电源模块组成,具有集成度高和通用化的特点。中频处理模块核心为一片SRAM型FPGA和一片反熔丝FPGA,具有AD转换、DA转换、监控刷新、快速捕获以及通道信号处理等功能;射频收发模块采用一次变频方案,具有上下变频的功能;二次电源模块为中频处理模块、射频收发模块、功放模块供电。设计中采用扩频通信体制结合卷积信道编码的方法,卷积编码良好的编码增益,弥补了中继测控通道的链路余量的不足。本文研制的终端实测指标符合设计要求,对二代中继卫星的测控具有实际的工程意义。

In order to meet the requirements of measurement and control system of 2 G CTDRSS,a universal SMA measurement and control terminal is designed.This terminal composed of IF processing module,RF transceiver module,power amplifier module,duplexer and secondary power module,has the characteristics of high integration and generalization.The core of IF processing module Involves a SRAM-based FPGA and an anti-fuse FPGA with AD conversion,DA conversion,monitoring and refreshing,fast acquisition,channel signal processing,etc.The RF transceiver module adopts a single frequency conversion scheme and has the function of up and down frequency conversion.The secondary power module supplies power to the IF processing module,RF transceiver module,power amplifier module.Spread spectrum communication system combined with convolutional coding is adopted in this design.The convolutional coding has a good coding gain,which makes up for the lack of link margin of the relay measurement and control channel.Ultimately,the experiment indicates that the measurement indicators of the developed terminal could meet the design requirements and has practical engineering significance for the measurement and control of 2 G CTDRSS.