毫米波高分辨雷达二步伸缩处理方法

TWO-STEP STRETCH PROCESSING METHOD FOR MMW HIGH-RESOLUTION RADAR

发射宽带线性调频脉冲信号 ,用伸缩处理方法可以获得目标高分辨距离像 ,并对静止目标实现精确测距 ,但当目标运动时 ,测距精度和成像质量都会受到速度的影响 .为了克服这些缺点 ,可以采用二步伸缩处理方法 .本文给出了理论推导和仿真结果 ,证明该方法的距离估计精度很高 ,对目标速度也可进行粗略的估计 .利用这些估计值可以完成对目标的距离跟踪、成像、状态的预测以及动目标指示等过程 .

By transmitting wide band LFM pulse and using stretch method, high resolution range profile of target can be obtained, and the range of still object can be exactly measured. While, the ranging precision and the quality of range profile may be influenced by the velocity of the object. To overcome these shortcomings two-step stretch processing method can be used. Theoretic derivation and the simulation results, that shows that by using this method range estimation with high precision and velocity roughly estimation can be obtained, are presented. By using these estimation values, the range tracking, profile, status forecasting and MTI (Moving Target Indication) process can be realized.