频率牵引和增益调节相组合的跟踪算法研究  

Research on Tracking Algorithm of Combination of Frequency Traction and Gain Adjustment

作　　者：雷明东[1] 李鹏[1] 欧汉文 LEI Ming-dong LI Peng OU Han-wen(Chongqing University of Arts and Sciences,School of Electrical and Electronic ,Chongqing Yongchuan 402160, China)

机构地区：[1]重庆文理学院电子电气学院,重庆永川402160

出　　处：《现代防御技术》2017年第5期141-148,共8页Modern Defence Technology

基　　金：国家自然科学基金青年科学基金项目(61604026);重庆市教委科学技术研究项目(KJ1501107);重庆文理学院校级科研项目(Y2014DQ31)

摘　　要：针对接收机在捕获后存在频差较大,以及在复杂运动场景下利用固定带宽跟踪环去跟踪卫星信号存在动态适应性较弱的问题,提出了一种基于频率牵引和自适应增益调节组合的跟踪算法。该算法首先利用频率牵引将捕获后的较大频差牵引到锁相环工作范围内,然后利用动态调节环路增益的方式,实现对环路带宽的动态调节。最后经过软件接收机测试表明:该算法能有效的缩减环路的收敛时间,具有更佳的噪声抑制和动态适应性。To solve the existing problem that the receiver has a large frequency difference after the capture and there is a weak dynamic adaptability when using a fixed bandwidth tracking loop to track the satellite signal in the complex motion scene,a tracking algorithm based on frequency traction and adaptive gain adjustment is proposed. The algorithm first uses the frequency traction to draw the larger frequency difference after Capture to the phase-locked loop working range. Then,the dynamic adjustment of loop gain is used to achieve the dynamic adjustment of the loop bandwidth. Software receiver test shows that the algorithm can effectively reduce the convergence time of the loop with better noise suppression and dynamic adaptability.

关 键 词：固定带宽 跟踪 频率牵引 自适应增益 组合 动态调节 

分 类 号：TN967.1[电子电信—信号与信息处理] TP301.6[电子电信—信息与通信工程]