摘要
建立了星载测控应答机中嵌套环路的仿真模型,对测控应答机中嵌套锁相环路进行了分析和优化。分析发现,存在一个最佳环路带宽,使接收机锁定时间最快;嵌套结构与单环结构相比,可以获得更优的噪声特性。这些结果已用于微小型化星载测控应答机设计中,并得到实验的验证。本文建立的仿真模型可用于测控应答机的设计、调试过程,以寻求最佳设计参数、提高性能指标。
A model of the nested phase locked loop （PLL） , which is the most important component in the TT＆C transponder, is established based on the modern charge -pump PLL. The lock time and phase noise characteristics are simulated, and the results are comparable with the test results of real circuit. The results indicate that there is a best loop bandwidth to make the lock time smallest. And the noise of the nested PLL is better than that of single PLL. This model can be used to optimize the performance of TT＆C transponder.
出处
《航天控制》
CSCD
北大核心
2006年第3期48-53,共6页
Aerospace Control
基金
教育部科学技术重点研究项目(微小卫星星载测控应答机研制(104096))
