基于BIT位修正与数据叠加的快速捕获算法  

Fast acquisition algorithm based on BIT correction and data superposition

作　　者：胡辉[1] 路春[1] 黄夏妹 

机构地区：[1]华东交通大学信息工程学院,江西南昌330013 [2]湖北工业大学理学院,湖北武汉434007

出　　处：《电子技术应用》2014年第4期109-112,115,共5页Application of Electronic Technique

基　　金：国家自然科学基金资助项目(61162015);江西省科技支撑计划项目(20123BBE50098)

摘　　要：基于BIT位修正技术以及数据叠加预处理技术,提出了一种在长积分时间条件下能够有效抑制导航数据跳变影响,同时降低捕获运算量的算法。该算法理论分析结果表明,在输入信噪比为-29 dB条件下,预检积分时间选取20 ms时,虚警概率Pfa=0.001时,检测概率Pd能够达到0.99,此时该算法运算量分别是延迟相乘算法、信号压缩算法、非相干捕获算法、FFT并行码搜索算法运算量的26.1%、21.4%、10.5%、8.07%,故此算法具有很大的优势。In this paper, an algorithm which can effectively restrain the navigation data transition and reduce the computational complexity has been proposed by using the BIT correction and data superposition preprocessing technology when using a long inte- gration time. The theoretical analysis results show that when the input SNR of signal is -29 dB, the integration time is 20 ms, false-alarm probability P~ equals 0.001, the detection probability Pd achieves 0.99. The computational complexity proportion of them are 26.1%, 21.4%, 10.5%, 8.07%, against with the delay multiplication algorithm, signal compression algorithm, non-coherent acquisition algorithm, FFT parallel code search algorithm respectively, therefore the new algorithm has great advantage.

关 键 词：BIT位修正 数据叠加 快速捕获算法 

分 类 号：TP92[自动化与计算机技术]