基于TEC曲线拟合的DS/FH跳扩频跟踪技术  

Carrier Tacking Technology in DS/FH Spread Spectrum Based on TEC Curve Fitting

作　　者：郭涛涛[1] 吴邈 

机构地区：[1]中国电子科技集团公司第二十七研究所,河南郑州

出　　处：《测绘科学技术》2018年第1期26-33,共8页Geomatics Science and Technology

摘　　要：针对DS/FH跳扩频系统中,不同跳频点在空间信道传输的相移不一致,引起的接收信号相位不连续这一问题,在分析信道传输特性的基础上,根据跳扩频接收信号的特点,提出了一种基于TEC曲线拟合的跳扩频跟踪方法,将电离层非线性相位偏移补偿引入跟踪环路,有效地解决了相位跳变导致的环路失锁的问题,提高了跟踪精度。最后用MATLAB模拟一组仿真数据,用本文所提的方法对电离层相位偏移进行估计,相位估计误差在±10°以内,可以满足跟踪环路的要求。In DS/FH spread spectrum system, different hopping frequency has different phase shift, which leads to the discontinuous phase of the receiving signal. On the basis of analysis of channels’ transfer characteristics, a carrier tacking technology based on TEC curve fitting is proposed which uses the character of the DS/FH receiving signal. The ionosphere phase compensation is imported in the tracking loops, which solves the problem of loop locking caused by the phase hopping. In addition, tacking accuracy is improved. Finally, MATLAB is used to estimate the ionosphere phase compensation by the method proposed in this paper. The simulation results show that, the phase estimation error is within plus or minus 10, which meets the tracking loop requirements.

关 键 词：DS/FH扩频 载波跟踪 TEC 相位污染 

分 类 号：TN91[电子电信—通信与信息系统]