【作者】 伊立峰；

【导师】 李一兵；

【作者基本信息】 哈尔滨工程大学 ， 通信与信息系统， 2007， 硕士

【摘要】 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-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。更多还原

【Abstract】 The Spread Spectrum technology has got wide usage upon communications, telemetry, and orientation because of its strong anti-interference ability, low probability of being intercepted and captured, strong discrimination ability, outstanding multi-access communication ability, and excellent secrecy.However, previously the SS system was only used separately in communications or orientation systems. Then the complexity, cost, and interference amongst different systems will affect the application of the SStechnology. Therefore, this paper proposed a new system: the multiplex system, which can finish the communication and the telemetry simultaneously, and can also overcome the disadvantages of combining the two systems directly. The paper also bring out using a special structure serial, the concatenate serial, to measure with double precision range, and at the same time realizing high speed SS communication with tamed-SS technology. Moreover, it gives the TDOA arithmetic on the base of circulation spectrum, which can enhance the communication and telemetry ability of the system. Basically the paper configured to use series-parallel ways to accomplish quick phase capture, and therefore realize telemetry and communication at the same time.The paper gives the simulation ways of MATLAB and DSP. And the simulation results show that the complex system can realize the theoretical target, including communication and telemetry simultaneously, finishing real-time measuring with high accuracy and huge range, realizing system function in unrealistic circumstances.更多还原