周视激光引信超低空探测地面回波特性研究

周视激光引信在超低空探测中采用距离波门压缩技术实现抗地杂波能力。针对波门压缩技术需利用地面回波精确、稳定测高的需求,研究了周视激光引信超低空地面回波特性。建立了周视激光引信超低空对地探测模型,利用双向反射分布函数,推导了周视激光引信在时域上接收的地面回波功率方程。计算和分析了在导弹飞行高度、导弹俯仰姿态、地表反射特征等不同条件下的地面激光回波参数。结果表明,周视激光引信对地测高固有绝对误差随着探测距离的增加而逐渐变大,而测高固有相对误差逐渐变小。随着俯仰角的增大,激光回波脉冲的脉宽展宽率增大。地表双向反射分布函数镜面反射分量越大,地面回波功率对导弹俯仰角的变化越敏感。可为超低空条件下周视激光引信抗地杂波的研究提供理论支撑。

Research on ground echo of ultra-low altitude detection by circumferential laser fuze

In the ultra-low altitude detection mode of circumferential laser fuze, range gate compression was used to achieve the ability of anti ground clutter. In order to meet the requirement of accurate and stable height measurement based on ground echo, the characteristics of ultra low altitude ground echo of circumferential laser fuze were studied. The ultra-low altitude ground detection model of circumferential laser fuze was established. Based on the bidirectional reflection distribution function, the power equation in time domain of the ground echo received by the circumferential laser fuze was derived. The laser echo characteristics of the ground were calculated and analyzed under different conditions of missile flight altitude, pitch attitude and ground reflection properties. The results show that the inherent absolute error of height detection by circumferential laser fuze increases with the increase of detection distance, while the inherent relative error decreases. With the increase of pitch angle, the pulse width broadening rate of laser echo pulse increases. The larger the specular reflection component of the bidirectional reflection distribution function of ground, the more sensitive the ground echo power varies with the missile pitch angle. Theoretical support was provided for the anti ground clutter research of circumferential laser fuze under the condition of ultra-low altitude.