固定多波束扩频测控信号同步实现技术

摘要

For fixed multibeam spread spectrum telemetry,track and command(TT&C) signals synchronous and beam scanning problem,a method to realize fast synchronization and beam scanning is proposed.Large frequency deviation pseudo-random-noise(PRN) code synchronization is realized quickly by time division multiplexing correlation matched filtering and delay locked loop.After removing modulation information of PRN stripped signals,combined with the feed forward fast Fourier transform to the frequency estimation and decision feedback frequency and phase locked loop,achieve carrier synchronization of tracking array beam and carrier tracking of both tracking array beam and switching array beam in the process of beam switching.The simulation results show that the method can satisfy the high dynamic multibeam spread spectrum TT&C signals fast synchronization,fast scan and switching process of continuous demodulation.%针对固定多波束扩频测控信号同步和波束扫描问题,提出了一种快速同步及波束扫描实现方法.该方法通过时分复用结构的部分相关匹配滤波和延迟锁定环,可实现大频偏情况下的快速伪码同步,剥离伪码后的信号经去调制处理后,结合基于快速傅里叶变换的前向频率估计和判决反馈锁频锁相环,实现跟踪阵列波束载波同步及波束切换过程中跟踪阵列波束及切换阵列波束的同时跟踪.仿真结果表明,该实现方法能满足高动态多波束扩频测控信号快速同步、快速扫描和切换过程连续解调的要求.