An Optimized Capture Algorithm for GPS Receiver
作者单位：School of Electronic Engineering. Beijing University of Posts and Telecommunications
会议名称：《第五届中国卫星导航学术年会》
会议日期：2014年
学科分类：08[工学] 0804[工学-仪器科学与技术]
关 键 词：Baseband receiver Integration time Guess-check capture algorithm High sensitivity
摘 要：The paper studies and designs a differential guess-check capture algorithm. This paper first makes a brief overview on coherent, incoherent and differential integration, then it contrasts effects of longer coherent integral time and incoherent integral time on the baseband loop, furthermore analyzes their features and shortcomings. The paper continues to discuss traditional capture algorithm, half-bits algorithm and full-bits algorithm. After analyzing theory and shortcomings, the paper proposes a kind of optimized differential guess-check capture algorithm. Through theoretical analysis and MATLAB software simulation verification, the paper simulated and compared the optimized algorithm with traditional loop algorithm on different data length 80ms, 180ms , 280ms.The result indicates the optimized one has bigger correlation peak and smaller noise fluctuation. Moreover, as the processed data lengthens, the optimized algorithm has more obvious advantage. Finally, the methods to reduce the capture time are analyzed and simulated. This shows that the scheme design is effective and feasible