GPS信号捕获中的数据预处理方法研究

Research on Method of Data Pre-processing for Acquiring GPS Signal

基于FFT的算法可以快速捕获GPS信号,成为一种经典捕获算法,为了进行FFT运算必须对数据进行预处理,以适应基2-FFT运算要求。仿真分析了平均采样法、脉冲重采样法和SINC函数插值法三种数据预处理算法,表明SINC函数插值方法信噪比损失较小,采用查找表方式对该方法进行了现场可编程门阵列(FPGA)具体实现,给出了详细设计过程,结果显示该方法占用资源少、效率高。

FFT-based algorithm to quickly capture the GPS signal has become a classic capturing algorithm.Data need to be preprocessed for performing the FFT operation in order to meet the base 2-FFT computation requirements.Three kinds of data preprocessing algorithms including the average sampling method,pulse re-sampling method and SINC interpolation method are used in the simulation.The results imply that SINC interpolation method loss less signal-to-noise.Using the look-up table method we realized the SINC method in field programmable gate array(FPGA) and presented the detailed design process.The results show that the method takes little resources and has high efficiency.