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  • Author Author: sophie0love
  • Date Created: 21 Nov 2010 1:46 AM Date Created
  • Last Updated Last Updated: 9 Nov 2021 4:49 PM
  • Views 505 views
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TDRSS通信链路的设计及性能分析

跟踪与数据中继卫星系统TDRSS(Tracking and Data Relay SatelliteSystem)是为中、低轨道航天器之间、航天器与地面站之间提供数据中继、连续跟踪与轨道测控服务的系统。作为一种新型的天基测控系统,TDRSS代表了国际上测控领域的新发展方向。本论文主要研究了我国TDRSS通信链路的数据传输性能及系统抗干扰性能。 首先,叙述了TDRSS的组成结构,分析了TDRSS前向链路和返向链路的信号形式,并分析了TDRSS采用的级联码实现信道前向纠错编码的编码方案。 然后,根据TDRSS通信链路总体设计要求,在不影响系统性能的前提下,采用降低信息传输速率的方法,设计了系统实现方案。对系统的各模块进行建模,给出了仿真实现的方框图,进行了系统性能分析。最终建立了完整的TDRSS仿真平台。 最后,对TDRSS通信链路中的捕获子系统进行了研究,并对其主要技术指标进行分析计算,提出了基于FFT技术的分段扩展循环相关伪码捕获方案;对系统建模仿真的结果进行了分析,讨论了在现行系统设计方案中通信数据传输的误码率性能,系统在不同编码方式、不同传输信道条件下系统的性能改善程度,以及系统抗干扰的性能。通过计算机仿真证明,所选信号形式构成的TDRSS是正确和可行的;为TDRSS总体设计及编译码系统指标的确定提供了定量分析的设计手段。

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