【作者】 任小杰；

【导师】 冯小平；

【作者基本信息】 西安电子科技大学 ， 电路与系统， 2006， 硕士

【摘要】 扩频技术是目前信息领域迅猛发展的一门前沿技术，它从军事通信开始，已应用到导航、测量、遥控等多个技术领域，正迅速的向个人通信和计算机通信渗透。本文主要讨论扩频测控系统的实现技术。首先介绍了扩频通信和扩频测控系统的基本理论，讨论了扩频系统的伪码同步和跟踪问题。然后给出了数字化扩频测控系统的设计方案，并且分析和讨论了中频数字化技术、双码测速、测距方法等。其次，根据系统设计方案建立了相应的仿真模型，利用MATLAB设计完成了仿真程序，并且进行了计算机仿真验证。通过对仿真结果的分析，验证了设计方案的可行性。在仿真中发现，系统频率误差和多普勒频偏的存在会导致解调出错。因此，在改进的仿真模型中，采用科斯塔斯环来完成载波频率的同步，最终得到了正确的解扩和解调结果。更多还原

【Abstract】 As an advanced technology, spread spectrum technology grows rapidly nowadays. It started from military communication and got involved into navigation, measurement, remote control fields and so on. Right now it gets closer and deeper to personal and computer communications.The paper mainly discusses the realization technology of measure and control system using spread spectrum method. Firstly, the principles of spread spectrum communication and measure and control system using spread spectrum method are introduced and those problems of code synchronization and tracking are deeply discussed. After that, the design scheme of digitization measure and control system using spread spectrum method is provided and then intermediate frequency digitization technology, distance and speed measurement methods of double codes are discussed and analyzed. Next, according to system request, the corresponding simulation system model is established. The simulated program is completed by MATLAB and validated by computer simulation. The feasibility of the design scheme is validated through the analysis of simulation result. During simulation process, mistakes could be possibly made cause of system frequency error and Doppler frequency shift. As a solution COSTAS is used in the improved simulation model to complete the synthesis of the frequency of the carrier and in the end the correct demodulation and dispread spectrum results are made.更多还原