多普勒效应下的跳频信号定时同步算法研究  

Research on Timing Synchronization Algorithm for Frequency-hopping Signals Under Doppler Effect

作　　者：陈敬乔[1] 汪颜 张静涛 CHEN Jingqiao;WANG Yan;ZHANG Jingtao(The 54th Research Institute of CETC,Shijiazhuang 050081,China)

机构地区：[1]中国电子科技集团公司第五十四研究所,河北石家庄050081

出　　处：《无线电通信技术》2024年第4期765-770,共6页Radio Communications Technology

摘　　要：由于收发信双方的相对高速运动会影响接收信号的同步和解调,特别是对符号速率每跳变化的跳频信号影响更大。针对跳频信号在高动态场景下的时钟同步问题,通过分析多普勒钟偏对时钟同步的影响,提出了基于同步信息的时钟频率估计加时钟相位估计定时同步方法,将二者的估计结果进行卡尔曼滤波,估计出钟偏及钟偏变化率,实时跟踪、调整接收机的时钟,达到收发信号时钟同步的目的。与三阶锁相环进行了仿真与对比,仿真结果证明,该方法比传统的锁相环方法跟踪范围大,估计精度高,解调性能更优良;解调性能损失与理论值相比小于0.2 dB。The relative high-speed movement between transmitting and receiving parties can affect the synchronization and demodulation of received signals,especially for frequency-hopping signals with symbol rates that change with each hop.To address the issue of clock synchronization for frequency-hopping signals in high-dynamic scenarios,this paper analyzes the impact of Doppler-induced clock offset on clock synchronization.A timing synchronization method is proposed,which combines clock frequency estimation based on synchronization information and clock phase estimation.Estimation results are then subjected to Kalman filtering to estimate the clock offset and its rate of change,allowing real-time tracking and adjustment of the receiver clock to achieve synchronization with the transmitted signal.Finally,simulations and comparisons with a third-order phase-locked loop are conducted.Simulation results demonstrate that the proposed method has a larger tracking range,higher estimation accuracy,and better demodulation performance compared to traditional phase-locked loop methods.The demodulation performance loss is less than 0.2 dB compared to the theoretical value.

关 键 词：跳频 高动态 频率估计 时钟跟踪 扩展卡尔曼滤波 

分 类 号：TN929[电子电信—通信与信息系统]