GLONASS接收机快速捕获方案及其仿真

对GLONASS接收机基带信号处理中的捕获过程进行研究,总结基带处理中目前可行的捕获算法,提出一种适于快速捕获的基于FFT的算法,并尝试使用二次曲线拟合的方法代替多次FFT的方法对相关峰值进行处理,得到更加精确的码相位,以便于更加精确的跟踪,针对低信噪比的情况,提出了两种增强信噪比的累加方法,最后在Matlab中进行算法的仿真.这种方法可以方便地在FPGA+DSP系统中实现,达到实时接收机要求的标准.

Method and simulation on GLONASS receiver fast acquisitun

It was discussed acquisition method in glonass receiver baseband signal processing,summarized feasible method at present,described a FFT-based fast acquisition method.Try to use conic fitting method instead of several FFT method to process correlation peak value.So it could be find more precise code phase in oreder to track signal with low noise.It was presented two signal addition methods to increase SNR,simulated acquisition process in Matlab.This method was convenience for implementing in DSP+FPGA System and achieved real-time receiver requirement.