都市条件下GPS信号源接收机仿真及链路分析

Simulation of Receiver and the Calculation of GPS Signal Source under Urban Environment

为了解决商业GPS信号源价格昂贵、功能单一、参数不可控的缺点,提出了根据无线通信系统基带等效模型应用SIMULINK和S函数建立接收机仿真模型。接收机带宽可根据需要调整;采用流水线ADC建立了参数可调的中频采样模块。各模块的参数均为实际电路的典型值,链路预算分析结果表明生成的GPS信号与实际环境相符合,相似度在0.9以上,具备实用性,可用于基带算法仿真。

For solving the weakness of commercial GPS signal simulator such as parameter uncontrollable. unitary function and costliness, A simulation model of GPS receiver has been put forward based on wireless communication system lowpass equivalent model. The bandwidth of receiver is adjustable, Adopting Pipeline ADC to built up parameter adjustable IF sampling block. The parameter of each block is worth for the typical value of actual circuit, Link budget analytical result expresses the generated signal agree well with actual one, the correlation coefficients is above 0.9. the simulator possess practicabitity and could be used to simulate the baseband algorithm.