复合地形场景下的米波雷达超分辨测高方法

Height Measurement Method for Meter Wave Radar in Composite Terrain Scenarios

文中重点研究一种典型“平坦+斜坡”复合地形场景下超分辨测高问题。根据阵列反射径回波遮蔽情况,将回波场景分成无遮蔽、全遮蔽和部分遮蔽等三种情况。传统的基于最大似然超分辨测高方法,无法适用于阵列反射径回波部分被遮蔽的场景。文中设计了一种自适应最大似然测高方法。首先,通过上下阵子阵分割,并行构建回波模型,采用模型匹配度预估反射点遮蔽边界大致位置;然后,基于阵列通道数据幅度差异,判别反射点遮蔽边界准备位置;最后,构建新的回波模型估计目标高度。仿真结果表明,该方法能够有效实现复合地形场景下米波雷达超分辨测高。

A super-resolution height measurement problem for a typical“flat+slope”composite terrain scene is discussed.According to the shielding situation of the array reflection path echo,the echo scene is divided into three situations:no shielding,full shielding,and partial shielding.The traditional maxi-mum likelihood super-resolution height measurement method is not effective for partial shielding scene.This article proposes an adaptive maximum likelihood height measurement method to solve this problem.Firstly,by segmenting the upper and lower sub arrays,parallel echo models are constructed,and the ap-proximate position of the reflection point masking boundary is estimated;Then,based on the amplitude difference between the array channel data and model,the precise position of the masking boundary is determined;Finally,a new echo model is constructed to estimate the target height.The simulation results show that this method can estimate the target’s height effectively in this typical composite ter-rain scenes.