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。 Signal acquisition in the GPS receiver is synchronized with the satellite signal by roughly adjusting the code phase and carrier frequency of the locally replicated signal. Signal Capture In fact a two-dimensional search process, the main challenge is computational complexity. FFT-based two-dimensional parallel acquisition method, you can search the entire two-dimensional uncertainty space, reduce the computational complexity at the same time improve the capture performance. The simulation results show that the satellite signal with carrier-to-noise ratio of 34 dB-Hz can be captured with 90% probability using 35 ms acquisition time.