一种高频区复杂雷达目标二维散射的参数模型

A Parametric Model for High Frequency Complex 2-D Radar Scattering

为描述高频区雷达目标复杂的二维散射 ,提出采用更贴近散射机理的、特征含量更为丰富的二维散射中心模型———类型区分的几何绕射理论 (TD GTD)模型。将一种高效的基于AGR的参数估计初始值选取方法 ,以及引入RELAX技术的最大似然估计算法 (ML RELAX) ,用于模型参量的估计。解决了同时估计多个散射中心这一造成计算量过大的根源问题。实验证实了TD GTD模型的合理性以及ML

A 2 D Type Discriminated Geometric Theory of Diffraction based (TD GTD) model that discriminates between the localized and distributed scattering centers of the radar target is presented. This scattering model provides a more physical relevant and richer description of high frequency complex scattering behavior compared with either point scattering models or prony models. To estimate the TD GTD model parameters, Maximum Likelihood Estimation (MLE) algorithm is developed. An effective method of parameter initialization is proposed. Since estimating parameters of all scattering centers at the same time is the cause of high computational cost and complexity, RELAX technique is introduced into MLE algorithms to get around that difficulty. The efficiency and feasibility of the method is confirmed by the test based on the measured data.