针对微小卫星测控应答机的体积、重量及其功能灵活性，研究了接收机载波恢复环的实现方法。
The implementation method of the receiver carrier recovery loop of microsatellite affects the volume, weight and function reconfigurability of the transponder.
本文论述了S频段地面测控站全频带适应统一应答机的设计特点，提出了全频带相参应答机的设计思路。
This paper describes the design features of full band transponder of earth-base TT&C system in S-band and the design idea of full band coherent transponder.
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