利用弹头目标微动信息的两种三维散射中心提取方法

Two 3-D Scattering Centers Extraction Methods by Using Micro-Motion Information of Ballistic Targets

雷达目标三维散射中心提取技术广泛应用于散射特性分析、建模以及目标跟踪。结合弹头目标的微动信息,可以间接得到雷达视角信息。本文在分析了此转化关系的基础上,提出两种三维散射中心提取方法,分别是投影方程求解法和球面拟合法。原理上,分别从代数和几何两个方向体现一维投影距离到三维空间位置的映射原理;算法上,解方程法是基于映射原理,进而求解矩阵方程来实现的;球面拟合法根据一维投影数据的球形分布规律从映射图中提取球面,过原点的直径与球面的交点即为强散射中心。GTD散射模型回波数据和暗室测量数据分别验证了这两种方法的有效性。最后,对两种方法的特点和性能进行了比较,同信噪比下,球面拟合法优于解方程法约15dB。

Three-dimensional（3-D） scattering centers extraction technology has been widely used in target scattering diagnosis, modeling and target identification.Combining the precession information of micro-motion target,the angle information of radar can be obtained indirectly.After analyzing this transformation,two 3-D scattering centers extraction methods were presented in this paper.Theoretically, the mapping principle of 1-D scattering center to 3-D position was reflected in algebra and geometry respectively.In algorithm, equation solving method was to solve the matrix equation based on the algebraic relations between the 1-D radial distance and 3- D position;spherical fitting method was to extract scattering centers from the mapping graph according to the spherical distribution of 1 - D projection data and intersection point of sphere and the diameter through the origin indicated the scattering centers.In addition,Two methods were all verified by experiments developed with simulated and measured data.Finally,the features and performance of two methods were compared and the result indicated that the spherical fitting method is better than the equation solving method by 15dB under the same SNR.