电讯技术2016，Vol.56Issue(5)：501-507,7.DOI:10.3969/j.issn.1001-893x.2016.05.006
微弱扩频信号捕获的积分时间延拓技术
Integration Time Prolonging Technology for Weak Spread-spectrum Signal Acquisition
刘田 1周文涛 1陈晓萍 1胡建平1
作者信息
- 1. 中国西南电子技术研究所，成都610036
- 折叠
摘要
Abstract
For general spread-spectrum receiver,weak spread-spectrum signal acquisition needs more inte-gration time in order to obtain processing gain. However,PN code Doppler-shift,which leads energy not continuously accumulated onto a single code phase,may limit further increasing of integration time. A time prolonging technology for spread-spectrum signal acquisition is proposed. The technology adds an integra-tion time prolonging unit to search for the paths of integration time prolonging results,which effectively rela-xes the integration time restriction caused by code Doppler-shift. The results of simulation and real data show the proposed algorithm has a higher upper-limit of integration time than traditional acquisition algo-rithm. For in-band signal-to-noise ratio( SNR) is below -50 dB GPS L1 P code acquisition,when certain hardware resource restriction is given,acquisition probability of the proposed algorithm is superior to that of the traditional algorithm by 3 dB.关键词
全球导航卫星系统/微弱扩频信号/非相干积分/积分时间延拓/捕获性能Key words
global navigation satellite system/weak spread-spectrum signal/incoherent integration/integra-tion time prolonging/acquisition performance分类
信息技术与安全科学引用本文复制引用
刘田,周文涛,陈晓萍,胡建平..微弱扩频信号捕获的积分时间延拓技术[J].电讯技术,2016,56(5):501-507,7.
