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Documents 通信测距复合系统中TDOA技术的研究
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  • Author Author: sophie0love
  • Date Created: 23 Nov 2010 2:52 PM Date Created
  • Last Updated Last Updated: 9 Nov 2021 4:52 PM
  • Views 402 views
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通信测距复合系统中TDOA技术的研究

扩频技术由于具有很强的抗干扰能力、很低的被截获概率、很高的距离鉴别力、良好的码分多址通信能力和很好的通信保密性等特性,在军事/民用通信和遥测、定位领域得到了广泛的应用。 然而以往完成扩频通信和定位任务是独立工作的系统,系统的复杂度、造价及系统间的电磁互扰不利于扩频技术广泛的推广。为此,本文提出一种全新结构的系统-复合系统,该系统能够同时完成扩频通信和测距任务,并且较好地解决了简单地把两个独立工作的子系统复合在一起带来的弊端。本文提出了应用特殊结构序列一链接序列进行双精度、双量程测距,并同时应用软扩频技术实现高速率扩频通信。在信号处理层面上,提出了应用循环谱分析理论建立组合式TDOA估计算法,提高了复合系统测距和通信的性能。初步设想应用并/串结合方式进行序列相位的快速捕获,借以实现实时测距和高速率扩频通信。 本论文在前面章节理论分析和推导的基础上,应用MATLAB等仿真软件编制时间流和数据流程序,对系统的技术性能进行仿真,结果证明复合系统能够较好地完成系统设计指标;同时完成扩频通信和测距任务,实现高精度、大量程、实时地测距,实现恶劣信道环境下系统的正常工作。并在DSP硬件平台上实现了关键技术的开发,也为该技术的进一步推广奠定了坚实的基础。

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