一种基于直升机毫米波雷达的高压线RCS快速计算方法

A Fast Calculation Method for Power Line RCS Based on Helicopter Millimeter Wave Radar

高压线一直是影响直升机特别是高速直升机飞行安全最主要的障碍物,需要全天候远距离检测高压线。相比于激光雷达和红外设备,毫米波雷达全天候能力更强,并且存在布拉格(Bragg)散射特征。本文针对现有高压线雷达截面积(RCS)计算方法计算效率不高的问题,提出结合特征模(CM)和谢尔曼-莫里森-渥德雷公式算法(SMWA)的高压线RCS计算方法,称为CM-SMWA方法。该方法将CM作为基函数,降低矩量法(MoM)中阻抗矩阵维数。利用SMWA直接求解基于CM的简化矩阵方程,进一步提升高压线RCS仿真效率,并采用提出的CM-SMWA方法进行了不同频率仿真,发现了高压线布拉格(Bragg)频率走动特征,该特征可改善高速直升机毫米波雷达高压线检测的性能。

Power lines have always been the main obstacle affecting helicopter flight safety,especially for high-speed helicopters,which require long-distance detection of power lines in all-weather.Compared to laser and infrared devices,millimeter wave radar has stronger all-weather capabilities,and there is a Bragg scattering feature.This paper proposes a power line RCS calculation method called CM-SMWA,which combines the Characteristic Mode(CM)and Sherman-Morrison-Woodbury Algorithm(SMWA)to address the issue of low computational efficiency in existing power line RCS calculation methods.This method uses CM as the basis function to reduce the dimensionality of the impedance matrix in Method of Moments(MoM).Using SMWA to directly solve the simplified matrix equation based on CM further improves computational efficiency.The proposed CM-SMWA method was used for different frequency simulations,and discovered the characteristics of power lines Bragg frequency walk,which can improve the performance of high-speed helicopters millimeter wave radar power lines detection.