三维成像雷达高度计成像模拟研究

Imaging Simulation Analysis of 3-D Imaging Altimeter

根据三维成像雷达高度计系统 ( CIALT,China Imaging Altimeter)的成像基本原理建立了一个模拟系统 ,用来获得原始数据并进行成像处理。在该模拟系统基础上 ,给出了对各种目标的模拟成像结果 ,并针对系统参数选择、窗函数选择以及聚焦深度和距离弯曲等因素对成像的影响进行了深入的讨论。最后 。

This paper is part of the Chinese 863-2 project 'Key Technology of Spaceborne T hree Dimentional Imaging Altimeter (CIALT: China Imaging Altimeter)'. CIALT sys tem is to be used for both ocean and land imaging with different modes and it is different from traditional altimeters because it gets height information by the interference of two complex-value images in two channels and it can get high- resolution 2-D images by synthetic aperture technology. CIALT can be used in ma ny fields. In this paper, both 2-D and 3-D imaging algorithms of CIALT system are described at first. Then according to the algorithms, this paper introduces a simulation system that can be used to get the raw data of targets and to proce ss it into radar images. Using this simulation system, the outputs of point targ et and face target are illustrated. Further more, the factors such as system par ameters, windowing functions, focus depth, range curvature and instability of Do ppler parameters that influence the resolution of output images are discussed in detail in this paper. In the end, some simple results of 3-D imaging are intro duced.