OFDM雷达信号合成目标高分辨距离像原理

Principle of Synthesizing High Resolution Range Profile of Targets Using OFDM Radar Signals

正交频分复用(OFDM)技术近年来受到雷达界的关注,将其应用于雷达可以获得优异的抗干扰性能、数字化处理方式以及多功能一体化系统的实现。OFDM雷达信号在单脉冲内合成宽带,具有高距离分辨率,文中在介绍OFDM雷达特点的基础上主要研究了合成目标高分辨距离像原理。首先建立了点散射目标的OFDM雷达回波模型,推导了合成目标高分辨距离像的数学原理。然后着重针对OFDM多载频信号自身的特点研究了频偏对高分辨距离像的影响,得出的结论对于OFDM成像雷达的设计具有指导意义。最后,仿真实验证明了结论的合理性。

Recently the orthogonal frequency-division multiplexing（OFDM）technique has drawn remarkable attention from the radar community.Several advantages can be applied to radar,such as anti-jamming/interference,digital signal processing,multifunctional system,and so on.OFDM radar signals synthesize wideband in a single pulse,with high range resolution.The principle of synthesizing high resolution range profile（HRRP） of targets using OFDM radar signals based on the structure of OFDM radar is mainly proved in this paper.At the beginning,the model of OFDM radar echo of point-scattering targets is described,and the mathematical principle of synthesizing HRRP is derived.Secondly,based on the characteristic of OFDM multicarrier signals,it mainly analyses the influence on high resolution range profile by frequency offset.The conclusion obtained is significant to the design of OFDM imaging radar.Finally,the validity of the conclusion is proved by the simulation.