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
陈敬乔 1汪颜 1张静涛1
作者信息
- 1. 中国电子科技集团公司第五十四研究所,河北石家庄 050081
- 折叠
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.
Abstract
The relative high-speed movement between transmitting and receiving parties can affect the synchronization and demodu-lation 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 syn-chronization 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Key words
frequency-hopping/high dynamics/frequency estimation/clock tracking/extended Kalman filter引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据