一种基于二分法的GPS弱信号快速捕获算法  

Dichotomy-Based Rapid Acquisition Algorithm for Weak GPS Signal

作　　者：李卫斌[1,2] 徐晓波[1] 尚保卫 马宪民[1] 

机构地区：[1]西安科技大学电气与控制工程学院,西安710054 [2]咸阳师范学院信息工程学院,咸阳712000 [3]陕西电子工业研究院,西安710069

出　　处：《计算机系统应用》2013年第7期95-99,共5页Computer Systems & Applications

基　　金：陕西省自然科学基金(2011JE011);科技部创新基金(11C26216106024);陕西省重大科技创新工程(2011ZKC06-4);陕西省科技计划项目(S2011GY1438);陕西省教育厅基金(08JK479)

摘　　要：在高灵敏度卫星导航接收机技术中,微弱信号捕获算法的捕获效率和运算复杂度是提高接收机灵敏度的关键.长时间相关积分是提高灵敏度的经典方法,但由于导航数据比特翻转的限制,一般积分时长为10ms.提出逐层分组数据相干积分,利用二分法估计比特翻转位置,可将累积时长扩展为19ms,从而提高捕获效率.同时根据卷积的线性关系,利用特定时间的数据累加替代卷积运算,从而降低相关积分的运算复杂度.理论分析和仿真结果表明该算法在提高接收机灵敏度的同时,有效降低了运算量.For the navigation satellite receiver technology, the weak signal acquisition is the key to improve the receivers＇ sensitivity. According to the characteristics of the weak signal, long duration correlation integral is the classic method. Unfortunately, the duration is always limited to 10ms for that navigation bit rate is 50bps. In this paper, a dichotomy-based acquisition algorithm is proposed to extend integration duration to 19ms. Meanwhile, to reduce its computation complexity, the convolution operation is replaced by summation for its potential linear relation in the special time. Theoretical analysis and simulated result proves that the proposed algorithm can improve receivers＇ sensitivity and reduce its computation.

关 键 词：弱信号 高灵敏度 数据比特 相干累积 二分法 

分 类 号：TN967.1[电子电信—信号与信息处理]