GPS接收机跟踪算法的设计与仿真

Design and Simulation of GPS Receiver Tracking Algorithm

论文主要对GPS接收机跟踪模块中的载波跟踪环和码跟踪环的环路结构进行了设计。首先跟踪模块的实现采用了码环与载波环相互耦合的结构,这样可以有效地降低环路的复杂度;在码环和载波环中分别采用了非相干的延迟锁定环路和相位跳转不敏感的Costas环路^([1]);鉴别器是对点积算法进行了归一化处理,因为经过归一化处理后的鉴别器将不受信号幅度的影响,且该算法的计算量较少^([2])。最后利用Matlab平台对所设计的接收机进行系统的建模与仿真,对仿真结果进行分析进而验证了跟踪环设计的正确性^([3])。

This paper mainly designs the loop structure of the carrier tracking loop and code tracking loop in the GPS receiver tracking module.First,the implementation of the tracking module adopts a structure in which the code loop and the carrier loop are coupled to each other,which can effectively reduce the complexity of the loop,non-coherent delay locked loops and phase skips are used in the code loop and the carrier loop,respectively.Sensitive Costas loop,the discriminator is a normalization of the dot product algorithm,because the normalized discriminator will not be affected by the signal amplitude,and the calculation of the algo-rithm is less.Finally,the Matlab platform is used to model and simulate the designed receiver,the simulation results are analyzed to verify the correctness of the tracking loop design.