垂直下视阵列天线三维合成孔径雷达（Three-Dimensional Synthetic Aperture Radar，3D-SAR）技术是近几年发展起来的新技术，它不仅具有全天候、全天时获取能力，而且突破了传统成像只有二维分辨率的概念，使获得的影像具有三维分辨率，通过对获取影像的排列，可直接快速获取地面点在成像坐标系中的三维信息。是SAR技术的一个重要发展方向，已受到各国SAR研究人员的高度关注。但其研究大多集中在3D-SAR成像技术和系统设计方面，而对于成像坐标系中的三维信息转换为DEM的数学模型、误差模型以及对定姿定位系统（POS）要求等问题的研究，目前国内外还没有相关的文献报道。由此，本课题将通过对3D-SAR成像机理的分析研究，提出阵列天线3D-SAR的DEM生成模型、误差模型以及对定姿定位系统（POS）要求，以解决阵列天线3D-SAR测绘使用问题。

Downward-looking three-dimensional imaging systhetic aperture radar(3D-SAR) based on linear array antennas is a new technology developed in recent years. It not only has all-weather all-time acquisition capacity, but also is a breakthrough concept of the traditional radar images with only two-dimensional resolution. It enables the radar images with three-dimensional resolution, and through arrayed images obtained, it can directly and quickly obtain the ground points in three-dimensional information in imaging coordinate system. As an important development direction of SAR technology, it has been a great concern of the SAR researchers in varies countries. Most researches are concentrated in the 3D-SAR imaging technology and system design, but resent researches have not yet reported at home and abroad in the mathematical model convertion from three-dimensional information in imaging coordinate system to DEM model, error models and the requirements of the position and orientation system (POS) system. Therefor this project will address the usage of the 3D-SAR based on linear array antennas through the researches in 3D-SAR imaging mechanism, LASAR DEM generation model, error model and the requirements of POS system.