基于FFT的GPS信号二维大规模并行捕获(英文)

FFT Based 2-Dimension Massively Parallel Acquisition for GPS Signal

GPS接收机中信号捕获通过粗略调整本地复制信号的码相位和载波频率与卫星信号同步。信号捕获实际上一个二维的搜索过程,其主要挑战是计算复杂度。基于FFT的二维并行捕获方法,可以一次搜索整个二维不确定空间,在减少计算复杂度的同时提高了捕获性能。仿真结果表明,采用35 ms的捕获时间可以90%概率捕获到载噪比为34 dB-Hz的卫星信号。

In a GPS receiver,the signal acquisition coarsely adjusts the code phase and the carrier frequency of locally generated replicas to align with the corresponding satellite signal.Signal acquisition is actually a 2-dimension searching process.The main challenge is computational complexity.The FFT based 2-dimension parallel acquisition method can search the entire uncertainty region in a single processing step.It can reduce the computational complexity as well as improve the acquisition performance.Simulation results show that signal of 34 dB-Hz can be acquired with probability of 90 % by adopting acquisition time of 35 ms.