Fast acquisition method of navigation receiver based on folded PMF-FFT

Jianzhong Qi, Feixiang Luo, Qingping Song
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引用次数: 10

Abstract

To overcome the influence of Doppler shifts for the acquisition time of navigation receiver in high dynamic situation, a improved method adopts an acquisition algorithm composed of Partial Matched Filter (PMF) and Fast Fourier Transform (FFT) method. The algorithm changes the traditional two-dimensional searching strategy based on spread spectrum code phase and signal-carrier frequency into one-dimensional searching strategy based on spread spectrum code phase. Moreover, PMF not only consumes many hardware resources but also fails to acquire long period Pseudo-Noise (PN) code. Considering of these drawbacks, an improved algorithm is proposed by using folded matched filter and accelerating the operation speed. The results of test show that folded PMF saves hardware resources and achieves double parallel fast acquisition of carrier and PN code.
基于折叠PMF-FFT的导航接收机快速捕获方法
为了克服高动态情况下多普勒频移对导航接收机采集时间的影响,改进方法采用部分匹配滤波(PMF)和快速傅立叶变换(FFT)相结合的采集算法。该算法将传统的基于扩频码相位和信号载波频率的二维搜索策略转变为基于扩频码相位的一维搜索策略。此外,PMF不仅消耗大量硬件资源,而且无法获取长周期伪噪声(PN)码。针对这些缺点,提出了一种采用折叠匹配滤波器的改进算法,提高了算法的运算速度。测试结果表明,折叠PMF节省了硬件资源,实现了载波和伪码的双并行快速采集。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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