针对复杂背景及目标的分形特性差异, 提取图像四个方向的灰度梯度, 选择最小梯度大于阈值的区域进行平滑滤波, 最后对分维参数进行分段线性拉伸-Extraction of image in four directions of the gray gradient, minimum gradient is greater than the threshold area smoothing filter, the last on the fractal dimension parameters of p

用修正矩阵束算法和二维旋转不变技术(2D-ESPRIT)提取基于 GTD 模型的目标二维散射中心参数-modified matrix pencil method and two dimensional (2D) ESPRIT method are proposed in this paper to extract the scattering centers based on GTD model to avoid these drawbacks. Simulations show that