GNSS多模接收机捕获模块的FFT算法设计

随着全球卫星导航系统(GNSS)及物联网技术的不断发展,GNSS多模接收机的应用越来越广泛．信号捕获作为接收机信号处理的第一步,其信号捕获能力的强弱直接影响着接收机的整体性能．本文针对多模接收机在捕获模块设计中遇到的快速傅里叶变换(FFT)算法兼容性差、运算时间长、资源占用大等问题,提出了一种优化方法.该方法通过加入原位运算、截位运算、模块重复利用、流水线结构等设计,以解决上述问题．经仿真验证,该方法在资源占用、运算时间、兼容性方面都有明显的改善． 

FFT algorithm design of GNSS multimode eceiver acquisition module

With the development of GNSS and Internet of things technology, multi mode receiver has been used more and more widely. As the first step of signal processing in the receiver,? signal acquisition ability directly affects the overall performance of the receiver. In this paper, an optimization method is proposed to solve the problems such as poor FFT algorithm compatibility, long operation time and large resource occupation encountered in the design of the capture module of multi mode receiver. The method is designed by adding intercept operation, module reuse and pipeline structure to solve the above problems. The simulation analysis and hardware implementation show that this method has obvious improvement in resource occupation, operation time and compatibility.