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介绍了一种S频段通用化跟踪与数据中继卫星系统(Tracking&Data Relay Satellite System,TDRSS)用户终端的实现方案,重点论述了射频通道的通用化设计和数字处理模块的实现。对70 MHz中频信号直接欠采样数字化后,利用FPGA完成中频处理的所有流程,实现了一个硬件平台满足不同通信频点、扩频伪码和信息速率的需求。系统具有体积小、重量轻的特点,适合应用于微小卫星平台。测试结果表明,能满足常规中继测控通信指标要求。
An implementation scheme of S-band Universal Tracking and Data Relay Satellite System (TDRSS) user terminal is introduced, and the universal design of RF channel and the realization of digital processing module are mainly discussed. After the 70 MHz intermediate frequency signal is directly under-sampled and digitized, all the processes of IF processing using FPGA are completed, and a hardware platform meeting the requirements of different communication frequency points, spread spectrum pseudo-codes and information rates is realized. System with small size, light weight, suitable for use in micro-satellite platform. The test results show that it can meet the requirements of conventional relay measurement and control communication.