A ssr can provide more useful information than primary surveillance radar ( psr ) but is subject to the proper functioning of the aircraft s transponder 二次监察雷达较一次监察雷达能提供更多有用的资料，但须依赖航机上应答器之正常运作。
Entering a geosynchronous transfer orbit . sinosat - 2 , mainly developed and manufactured by the chinese academy of space technology , weighs about 5 . 1 tons and has 22 transponders 由中国空间技术研究院开发研制的“鑫诺二号”通信卫星重约5 . 1吨，星上载有22个转发器。
All these results indicate that the s - band tt & c transponder we developed reach the design expectation or even outdo and can basically satisfy engineering requirements 这些结果表明，本文研制的s波段测控通信一体机达到或超过设计的指标，并且基本符合工程化的要求。
The main tasks in this thesis focus on intermediate frequency digitized technology for tdrss user transponders , which is a part of the novel technology research of transponders 本论文所研究的课题是tdrss用户应答机中频数字化技术，是“应答机新技术研究”的一部分。
