全球定位系统2026，Vol.51Issue(1)：72-80,9.DOI:10.12265/j.gnss.2025121
Nuttall窗改进PMF-FFT捕获算法研究
Improved PMF-FFT acquisition algorithm based on Nuttall windows
摘要
Abstract
The partial matched filter-fast Fourier transform(PMF-FFT)algorithm can achieve fast parallel acquisition of spread spectrum signals.However,the scalloping loss introduced by its FFT part reduces signal acquisition performance.Based on an analysis of the scalloping loss improvement effects of traditional Hanning and Hamming windows,and addressing the insufficient improvement caused by their less-than-ideal maximum side-lobe peak and attenuation rate,this paper proposes a PMF-FFT signal acquisition algorithm improved by the Nuttall windows.Nuttall windows with different numbers of terms and orders were selected,and their amplitude-frequency characteristics were analyzed.Simulation experiments verified the scalloping loss improvement effect.Results show that the 4-term 5th-order Nuttall windows provides better improvement;it can reduce the scalloping loss introduced by the FFT part from-4.04 dB to-13.05 dB.Under a constant false alarm probability,the single-point detection probability of the signal increases from 20%to 98.16%,and the mean acquisition time decreases from 300 ms to 33.44 ms.This effectively improves the acquisition performance.关键词
部分匹配滤波器快速傅里叶变换(PMF-FFT)/扇贝损耗/Nuttall窗/单点检测概率/平均捕获时间Key words
PMF-FFT/scalloping loss/Nuttall windows/single-point detection probability/mean acquisition time分类
天文与地球科学引用本文复制引用
张傲,何在民,张池,沈明阳,董森,商琳格..Nuttall窗改进PMF-FFT捕获算法研究[J].全球定位系统,2026,51(1):72-80,9.基金项目
国家自然科学基金(12403078) （12403078）
