基于快速相关运算的卫星接收机矢量跟踪算法  

Vector tracking algorithm based on fast correlation operation in GNSS receivers

作　　者：谢非[1] 刘建业[1] 李荣冰[1] 徐昭[1] 

机构地区：[1]南京航空航天大学导航研究中心,南京210016

出　　处：《中国惯性技术学报》2014年第1期94-99,共6页Journal of Chinese Inertial Technology

基　　金：国家自然科学基金(61273057;91016019);航空科学基金(20100852010);江苏高校优势学科建设工程资助项目;南航基本科研业务费专项科研项目资助

摘　　要：针对矢量跟踪过程中基带信号相关处理运算耗时较多的问题,提出了本地表及快速相关运算的优化处理方法,优化后的矢量跟踪环路中本地信号与输入信号的相关运算由耗时较多的浮点型运算转换为速度较快的位运算方式,降低了跟踪过程中的运算量,提高了矢量跟踪算法的运行速度。最后,利用实测的卫星中频信号对传统算法与优化算法进行了实验测试与性能分析对比,实验结果表明矢量跟踪算法对弱信号的持续跟踪能力优于传统标量跟踪方法,优化后的算法和原矢量跟踪算法相比信号处理时间约节省30%,有效改善了卫星接收机矢量跟踪算法中基带信号的处理效率。Since the correlation processing of baseband signal in vector tracking loops of receivers take too much time, a local table design and an optimized algorithm based on a fast correlation method are proposed. In the optimized vector tracking loops, the floating point operation is replaced by bit arithmetic which is faster in correlation operation of local signal due to reduced computation in vector tracking process. Finally, the actual intermediate frequency GPS signal is used to test the performance of proposed algorithm. The experiment results indicate that the vector tracking algorithm is superior to the traditional tracking method in terms of continuous tracking capacity of weak signal, and the optimized method in GPS receiver can improve the baseband signal processing speed by 30% compared to the common vector tracking algorithm.

关 键 词：卫星接收机 矢量跟踪 相关运算 弱信号 

分 类 号：U666.1[交通运输工程—船舶及航道工程]