摘要
针对无人机远距离测控通信系统中CPM接收信号微弱难以捕获跟踪而影响链路稳定性的问题,提出一种基于混沌Duffing振子的多进制调制并行检测同步方法。设计PRCPM信号的混沌振子同步单元,根据混沌临界、大尺度周期态等不同状态条件下的频率分量变化趋势,与信道估计典型阈值对比完成捕获,然后引入PID算法计算频率微分量实现跟踪。仿真结果表明:利用混沌振子对初始值敏感和噪声免疫的特性,能够在低信噪比信道环境下实现CPM信号的精确同步,同时采用多通道并行频率检测满足无人机测控高实时、快速同步建立的要求。
Aiming at the problem that the CPM received signal in the long distance measurement and control communication system of UAV(unmanned aerial vehicle)is weak and difficult to capture and track,which affects the stability of the link,a multi-ary modulation parallel detection synchronization method based on chaotic Duffing oscillator is proposed.The chaotic oscillator synchronization unit of PRCPM signal is designed.According to the change trend of frequency components under different conditions such as chaos critical state and large-scale periodic state,the acquisition is completed by comparing with the typical threshold value of channel estimation,and then the PID algorithm is introduced to calculate the frequency differential quantity to realize the tracking.The simulation results indicate that by using the characteristics of chaotic oscillator sensitive to initial value and immune to noise,the precise synchronization of CPM signal can be realized in the low SNR channel environment,and the simultaneous multi-channel parallel frequency detection can meet the needs of UAV measurement and control high real-time and fast synchronization establishment.
作者
朱铁林
王平
杨晨
ZHU Tie-lin;WANG Ping;YANG Chen(Tianjin Zhongwei Aerospace Data System Technology Co.,Ltd.,Tianjin 300458,China;Tianjin Key Laboratory of Intelligent Information Processing in Remote Sensing,Tianjin 300458,China)
出处
《通信技术》
2020年第5期1086-1091,共6页
Communications Technology
基金
国家重点研发计划资助项目(No.2016YFB0502600)
天津市科技计划项目(No.19YDSSGX00320)。
关键词
CPM信号
混沌振子
多通道并行检测
PID算法
无人机测控通信
CPM signal
chaotic oscillator
multi-channel parallel detection
PID algorithm
UAV measurement and control communication
