一种基于地形驻点分割的多通道SAR三维重建方法

摘要

Multi-channel SAR can reconstruct the 3-D surface of the observed scene with its resolution power in the elevation. However, with limited baseline length, most methods suffer from limited precision and significant miss rates. In view of this situation, a new 3-D reconstruction method using terrain stagnation point based division is proposed. Firstly, 3-D distribution is obtained using tomography; secondly, stagnation point position and division are conducted to separate the layover; then 3-D reconstruction is conducted using interferometry. This method combines the resolving power of multi-channel SAR and high precision of interferometry. Therefore, reconstruction results with higher precision and greater stability are achieved. The effectiveness of the method is validated using experiments with simulated data.%多通道SAR具有高度向分辨能力，能够实现叠掩场景的3维重建，但是由于其基线长度有限，利用现有方法进行重建所得高程定位精度往往较差，而且由于叠掩区域散射系数起伏较大，重建结果中存在较多的漏检。针对以上问题，该文提出一种基于地形驻点分割的多通道SAR 3维重建方法，首先通过层析获得场景3维分布的草图，之后通过地形驻点定位及以地形驻点为门限的分割得到不叠掩的数据，最后利用干涉信号处理实现场景的3维重建。该方法结合了多通道SAR的高度向分辨能力和干涉信号处理的高精度，能够更加稳定、精确地实现叠掩场景的3维重建，基于实际场景缩比模型的仿真实验结果验证了该文算法的有效性。