激光遥感成像多回波合成算法

Synthesizing algorithm for laser remote sensing imaging multi-signal

根据提高激光遥感成像分辨率的需要,分析了该成像分辨率的影响因素,说明了仅利用回波时延和强度信息的传统处理方法,难以得到光斑内部地表信息,在某些情况下,甚至会造成较大的成像误差。通过对激光遥感成像回波信号模型研究和沿飞行路径的多回波信号关系分析,得到了多次回波关系方程组。利用激光光斑子区域划分和多回波方程组求解,从合成回波信号中提取出子区域回波信息。对子区域回波通过波形分解拟合算法得到子区域地表高度分布信息。通过与传统分析方法得到的成像结果相比,证实该分析方法可以有效提高成像分辨率和成像精度。

It is the hot topic to improve the imaging resolution in the laser remote sensing. However,the traditional data processing method only employs the echo delay and intensity information that can′t get the terrain detail topography information in the footprint. So the serious loss of image quality may occur in some cases. The synthesizing algorithm for laser remote imaging multi-signal was studied and provided to get the imaging information inside the laser footprint. The key issue is to construct the model between the laser imaging signal and the terrain attribute identities in the footprint. Firstly,the basis laser imaging signal model on the single detecting was obtained. On the basis,the relation of multi-signal along the flight route was analyzed. The multi-signal equation group had been gotten. The sub-region echo information was gained by dividing the laser point print into several sub-regions and solving the equation group. The wave analysis method was built to process the sub-region echo for obtaining the detail identities of the sub-region. At last,the high resolution laser image had been obtained by the simulation employing the synthesizing algorithm. Compared with the image resolution in traditional laser data processing,the proposed method has the ability to improve the resolution of the laser imaging,and obtain the detail information inside laser footprint. It is very useful for the laser imaging remote sensing at the long distance.