一种小型化高可靠USB测控应答机的设计与实现

Design and Realization of a Miniaturized, High Reliable USB TT&C Transponder

文章介绍了一种基于USB体系的星载测控应答机,通过在收发通道中使用射频集成器件、用有源滤波器来提取测距信号和遥控BPSK信号等技术方案,使其体积和重量相比传统的USB测控应答机减小了一半以上。同时,优化了锁相环环路参数,使该应答机能实现较高的锁定灵敏度和较宽的频率跟踪范围。实测结果表明,该应答机的锁定灵敏度、频率跟踪范围、遥控信道的信噪比、遥控BPSK信号保真度、主次侧音相位偏差等指标均能满足系统要求,测距性能优良。该应答机完全用模拟器件实现,抗辐照能力强,具有较高的实用价值,可广泛用于各类军用和民用卫星。

A satellite TT＆C transponder based on the unified S-band System is introduced. By using RF integrated devices in the transceiver channel and using active filters to extract the range signal and the telecommand BPSK signal, the size and weight of the transponder has been reduced by more than one half, compared to the traditional USB TT＆C transponder. To realize higher locking sensitivity and wider frequency tracking range, PLL parameters are optimized. Measured results show thatthe main technical specifications of the TT＆C transponder such as locking sensitivity, frequency tracking range, telecommand channel SNR, telecommand BPSK signal fidelity, tone phase deviation can meet the system requirements. The ranging performance of the TT＆C transponder is also excellent. The proposed TT＆C transponder is realized completely by analog devices, so it has strong ability of resisting radiation. The proposed TT＆C transponder has high practical value and can be widely used in all kinds of military and civil satellites.