一种LFMCW雷达距离速度去耦合方法

宽带线性调频连续波雷达应用非常广泛,但目标运动会带来距离与速度耦合的问题从而使距离谱产生模糊。文中在分析目标回波信号基础上,提出了一种基于Radon-Ambiguity变换与分数阶傅里叶变换的距离速度去耦合新方法。该方法利用Radon-Ambiguity变换和分数阶傅里叶变换分别估计回波信号的调频率和估计初始频率,最终实现距离速度去耦合。仿真结果验证了该算法的有效性,算法同时具有速度快、精度高等优点。

A Method of Range-velocity Decoupling for LFMCW Radar

Wide band linear frequency modulated continuous-wave radar has been widely used nowadays.However,the movement of target causes range-velocity coupling which will in trun cause the ambiguity of range profile.Through analyzing the target echo signal,a new range-velocity decoupling method is obtaind.Using the Radon-Ambiguity transform and the fractional Fourier transform,this method estimated the frequency modulation rate and the initial frequency of the echo signal,and the range-velocity decoupling was realized at last.Finally,The simulation results confirmed the validity of this algorithm.Simultaneously,the light computation load,precision and some other merits of this algorithm were disscussed in this paper.