雷达合成孔成像系统信号优化处理仿真  

Simulation of Signal Processing and Optimization of Radar Synthetic Aperture Imaging System

作　　者：张廷军 黄晓红 ZHANG Ting - jun HUANG Xiao - hong(College of Information Engineering, North China University of Science and Technology, Tangshan Hebei 063000, Chin)

机构地区：[1]华北理工大学信息工程学院,河北唐山063000

出　　处：《计算机仿真》2017年第10期22-25,118,共5页Computer Simulation

摘　　要：线性调频信号作为传统雷达较为常用发射信号,在现代战争中存在易于被敌方发现并容易受到干扰的缺点,而混沌信号具备对初始值敏感与类似随机的特性,但由于只有实部构成的混沌序列具有较高的峰均比,无法满足雷达对发射信号的要求。通过对Lorenz混沌序列进行优化处理降低峰均比,使其具有较为优良的自相关特性及紧致的能量谱,适于作为发射信号。运用优化后的混沌调频信号对点目标进行成像仿真,得到混沌调频信号在距离向较线性调频信号5倍的分辨率。验证了Lorenz混沌调频信号可以应用于雷达合成孔径成像且具有较好的分辨率,并且在雷达应用领域具有较大的潜力及开发价值。As the common transmitting signal frequently used by traditional radar, the linear FM signal has the disadvantages like easy to be found and interfered by the enemy in modem war. Although chaotic signal is sensitive to the initial value and random - like, it still cannot satisfy the requirement of radar for transmitting signal because only the real part of chaotic sequence has a high peak - to - average power ratio. By optimizing the Lorenz chaotic se- quence to reduce the peak - to - average power ratio, it is suitable for being taken as transmitting signal with relative- ly good self - correlation performance and compact energy spectra. Using the optimized chaotic FM signal to carry out the imaging simulation of point target, the obtained range resolution of chaotic FM signal is five times that of the line ar FM signal. Consequently, the Lorenz chaotic FM signal can be applied to radar synthetic aperture imaging and has great potential and development value in the field of radar application with a better resolution.

关 键 词：混沌调频 合成孔径雷达 成像 

分 类 号：TN955[电子电信—信号与信息处理]