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With the ability of 3-D resolution, LASAR is more suitable for the reconnaissance and surveying applications in urban and mountain areas. However, there are some obstacles for airplane-borned LASAR. Compared with airplane, airship is more feasible for LASAR, because of its large size, long duration and huge loading capacity. Combined with MIMO and sparse array techniques, the system cost is affordable in practice. Sparsity of 3-D image should be highlighted during the course of image processing, which can reduce the algorithms' complexity and improve the image quality.