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为了研究现代化的GPS新民用信号仿真系统的设计和实现,介绍了现代化的GPS信号组成及其结构特点,包括L2C,L5和L1C信号.对仿真系统各模块的设计和实施方法进行了详细描述.该信号仿真系统主要包括:参数设置、系统初始化、信号产生、噪声产生、干扰产生、信号合成、低通滤波、A/D转换以及信号存储等主要功能模块.通过Matlab对该信号仿真系统进行仿真,并重点分析了所有导航信号的功率谱密度.结果表明该仿真系统能够完成现代化的GPS新民用信号物理层仿真,并可为现代化的GPS民用接收机尤其是软件接收机的设计和测试提供可控信号源.
In order to study the design and implementation of modern GPS new civilian signal simulation system, the modern GPS signal composition and its structural features, including L2C, L5 and L1C signals, are introduced.Design and implementation methods of each module in the simulation system are described in detail. The signal simulation system mainly includes the main function modules of parameter setting, system initialization, signal generation, noise generation, interference generation, signal synthesis, low pass filter, A / D conversion and signal storage, etc. The signal simulation system is simulated by Matlab , And emphatically analyzes the power spectral density of all navigation signals.The result shows that the simulation system can complete the modern GPS new civilian signal physical layer simulation and can provide the design and test for the modern GPS civil receiver especially the software receiver Control signal source.