机载米波雷达基于镜面反射多径模型的目标高度计算和距离计算方法研究

Research on Target Height Calculation and Distance Calculation Methods for Airborne Meter Wave Radar Based on Mirror Reflection Multipath Model

本文建立了基于球面的电磁波镜面反射模型,推导了由多径距离计算目标海拔高度的公式和由目标海拔高度计算多径距离的公式,考虑到公式无解析解,依据单调性提出了近似解的二分算法,与迭代算法相比,该算法能够完全收敛于真实解。此外,给出了海面多径产生的条件、多径点的信息特征及多径测高的边界。同一目标的多径点与真实点具有相同的多普勒速度、方位角度,且多径距离与直达波距离满足相应的距离差值,依据该特征,对检测的点迹进行配对,并区分真实点和多径点,可以有效解决多径引起的双航迹和短航迹问题。以外,由多径距离还可以获得目标的海拔高度。最后,基于仿真数据,给出了典型参数下的多径测高精度。

This article establishes a spherical electromagnetic wave mirror reflection model and derives formulas for calculating target altitude from multipath distance and multipath distance from target altitude.Considering that the formula has no analytical solution,a binary algorithm for approximate solutions is proposed based on monotonicity.Compared with iterative algorithms,this algorithm can fully converge to the true solution.In addition,the conditions for the generation of multipath on the sea surface,the char-acteristics of multipath points,and the boundaries for multipath height measurement are provided.The multipath points of the same target have the same Doppler velocity and azimuth angle as the real points,and the multipath distance and direct wave distance satisfy the corresponding distance difference.Based on this feature,pairing the detected points and distinguishing between real points and multipath points can effectively solve the problem of dual trajectory and short trajectory caused by multipath.In addition,the altitude of the target can also be obtained from the multipath distance.Finally,based on simulation data,the multipath height measurement accuracy under typical parameters is provided.