基于宽带LFM雷达的弹道目标精确测速方法

由于弹道中段末期稀薄大气对轻诱饵具有明显的减速作用，精确的速度测量是该阶段真假目标识别的重要途径之一。提出了一种基于宽带线性调频(linear frequency modulation，LFM)雷达回波信号的精确测速方法，该方法对雷达中频回波信号相位差进行最小二乘参数估计，完成弹道目标速度的精确测量。针对低信噪比条件下的精确测速问题，采用恒虚警率(constant false alarm rate，CFAR)检测与形态学滤波相结合的技术对噪声进行抑制，有效地提高了算法的鲁棒性和测速精度。对典型弹道目标的动态雷达特征信号及测速算法进行了仿真和分析，验证了算法的有效性。

Accurate velocity measurement method for ballistic objects using wideband LFM radar

During the ballistic midcourse terminal phase, the rarefied atmosphere starts to decelerate the light weight decoys. As a result, accurate velocity measurement becomes one of the basic approaches to discriminate ballistic warheads from penetration aids. A novel technique for accurate velocity measurement from wideband linear frequency modulation (LFM) radar signatures is proposed. A least square approach is applied to estimate the object velocity using phase difference of the received intermediate frequency returned signals. In the cases of lower signal-to-noise ratio (SNR), constant false alarm rate (CFAR) detection and morphological filtering are subsequently adopted to suppress the noise, improve the robustness and further enhance the velocity accuracy. Numerical simulation and analysis for dynamic radar signatures of a typical ballistic object is conducted. Simulation results validate the effectiveness of the proposed method.