论文部分内容阅读
基于相位调制扩容1090ES信号为ADS-B带来新的功能和应用,载波频率同步是扩容信号需解决的一项关键技术。针对扩容1090ES信号的突发载频同步问题,提出了一种基于频偏捕获和相位误差跟踪环的快速同步方法,频偏捕获采用前导辅助脉冲相关性判决进行二叉树频率搜索,捕获载频偏差并校正得到频偏较小的基带信号,相位误差跟踪环实现对小频偏信号进行频率估计和补偿。仿真结果表明:该方法适用于基于相位调制的扩容1090ES信号接收系统。
The expansion of the 1090ES signal based on phase modulation brings new functions and applications to ADS-B. The carrier frequency synchronization is a key technology to be solved for the signal expansion. Aiming at the problem of burst carrier frequency synchronization of 1090 ES signal, a fast synchronization method based on frequency offset acquisition and phase error tracking loop is proposed. Frequency offset acquisition uses the leading auxiliary pulse correlation decision to search binary tree frequency, The baseband signal with a small frequency offset is corrected and the phase error tracking loop performs frequency estimation and compensation for the small frequency offset signal. The simulation results show that this method is suitable for the phase modulation-based expansion 1090ES signal receiving system.