计算机工程与应用Issue(5)：212-215,4.DOI:10.3778/j.issn.1002-8331.1209-0245
一种改进的基于FFT弱信号捕获算法
Improved algorithm of weak signal acquisition based on FFT
摘要
Abstract
A differential coherent accumulated acquisition algorithm based on Fast Fourier Transform(FFT)weak signal block accumulation of the intermediate frequency is presented in this paper. To reduce coherence computation, the pro-posed algorithm performs the block accumulation of the intermediate frequency signal before FFT. To solve the two prob-lems in traditional acquisition algorithms based on FFT weak signal, namely great computation of coherent integral and square loss caused by incoherent accumulation, the proposed algorithm performs the differential coherent accumulation after IFFT. The simulation experimental results show that the algorithm quickly and accurately acquires the input signal with SNR of -39 dB/2 MHz. The algorithm reduces the calculations, eliminates square loss and improves the signal to noise ratio.关键词
全球定位系统(GPS)/弱信号/捕获/中频信号块累加/差分相干Key words
Global Positioning System(GPS)/weak signal/acquisition/block accumulation of intermediate frequency/difference correlation分类
信息技术与安全科学引用本文复制引用
冯继威,石敏,易清明..一种改进的基于FFT弱信号捕获算法[J].计算机工程与应用,2014,(5):212-215,4.基金项目
广东省突发事件应急中心项目（粤科函社字[2011]733号）；广东高校产学研结合示范基地重大项目（No.cgzhzd1103）；广东省工程技术研究中心项目（No.2012gczxA003）。 （）
