S频段联试应答机的改进设计

Improved Design of S-band Unified Test Transponder

针对S频段联试应答机提出了接收和发射频综共用的改进设计方案,对改进后的应答机频率关系、组合干扰、信号处理单元以及信道单元设计进行了分析、仿真和测试,结果表明其功能和性能指标满足S频段测控系统的系统联试要求。该设计在满足接收和发射载波频率相干转发比的同时节省了一个频综,同以往的S频段联试应答机相比具有硬件电路简单、成本低、可靠性更高的优点。

An improved design scheme with only one common frequency synthesizer used for RF receiving and transmitting channel of S - band unified test transponder is proposed in this paper. The improved transponder＇s frequency flow, combined frequency interference, the design of signal processing unit and signal channel is analysed, simulated or tested. The results show that its functions and performance satisfy the test requirements of S - band TF＆C system. One frequency synthesizer is saved in this design under the condition that the coher- ent turn- around ratio between receiving frequency and transmitting frequency is satisfied at the same time. Compared with the unimproved one, it has simplified hardware, lower cost and higher reliability.