DCT变换域滤波码捕获方法

doi:10.3969/j.issn.0372-2112.2012.10.037

电子学报 ›› 2012, Vol. 40 ›› Issue (10): 2122-2126.DOI: 10.3969/j.issn.0372-2112.2012.10.037

DCT变换域滤波码捕获方法

李小捷, 许录平

西安电子科技大学电子工程学院, 陕西西安 710071

收稿日期:2011-04-13 修回日期:2012-04-12 出版日期:2012-10-25
- 作者简介:
- 李小捷 女,1974年1月出生于陕西汉中,高级工程师,2001年获得西安电子科技大学电路与系统硕士学位,现为西安电子科技大学电路与系统专业博士研究生,主要研究方向为导航接收机、通信信号处理. E-mail:xjli_xa@126.com 许录平 男,1961年生于陕西扶风,博士,西安电子科技大学电子工程学院教授,博士生导师,中国通信学会通信理论与信号处理专业委员会委员,中国电子学会高级会员.主要研究方向信息对抗、信号与信息处理.
- 基金资助:
- 国家自然科学基金 (No.61172138); 国家863高科技发展计划重大课题 (No.2007AA12Z323)

DCT Transform Domain Filtering Code Acquisition Method

LI Xiao-jie, XU Lu-ping

School of Electronic Engineering, Xidian University, Xi’an, Shaanxi 710071, China

Received:2011-04-13 Revised:2012-04-12 Online:2012-10-25 Published:2012-10-25
- Supported by:
- National Natural Science Foundation of China (No.61172138); Major Project of National High-tech R&D Program of China (863 Program) (No.2007AA12Z323)

摘要/Abstract

摘要： 针对较小时频不确定度的卫星信号捕获,提出了一种结合离散余弦变换(DCT)的码捕获算法.首先对信号进行部分匹配滤波(PMF),然后对各个码相位对应的PMF输出矢量进行DCT变换域滤波及信号重构,最后对信号进行基于能量的检测.由于PMF输出信号和噪声时变特性不同,滤波重构后信号能量几乎无损,而噪声能量得到了明显降低,从而提高了相同虚警概率下的捕获概率.理论分析和仿真结果表明本文检测算法可以有效提升检测概率,并且具有较低的复杂度.

关键词: 码捕获, 检测, 离散余弦变换, 虚警概率, 检测概率

Abstract: Focusing on the satellite signal acquisition with low time and frequency uncertainty,we propose a novel code acquisition algorithm based on discrete cosine transform (DCT).Firstly,we obtained a set of time-domain related vectors by partial matched filter (PMF).Then we performed the transform domain filtering and signal reconstruction for every candidate code phase.Because the signals and noise produced by PMF have different time-varying property,noise is greatly reduced and the signals have almost no loss,thereby increasing the probability of detection under the same probability of false alarm.The theoretical analysis and simulation results show that the detection algorithm can effectively improve the detection probability,and has a lower complexity.

Key words: code acquisition, detection, discrete cosine transform, probability of false alarm, probability of detection

中图分类号:

TN927

李小捷, 许录平. DCT变换域滤波码捕获方法[J]. 电子学报, 2012, 40(10): 2122-2126.

LI Xiao-jie, XU Lu-ping . DCT Transform Domain Filtering Code Acquisition Method[J]. Acta Electronica Sinica, 2012, 40(10): 2122-2126.

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DCT变换域滤波码捕获方法

DCT Transform Domain Filtering Code Acquisition Method

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