两种SAR数据目标定位的比较

和以前的定位方法相比,距离-多普勒(R—D)定位法因不需要选地面参考点进行定位,在许多遥感应用方面具有独特的优势和重要意义。本文论述了利用卫星星历数据和雷达回波数据的距离-多普勒信息对SAR图像目标定位的原理,并对相对位置定位算法的计算公式进行了推导。通过该定位方法对Radarsat和ERS图像目标进行了定位,详细说明了轨道参数、斜距参数、多普勒参数等获取方法,比较了这两种数据目标定位具体算法和精度的差异。

Research on the ground target location comparison of both spaceborne SAR images

In this paper, the image target location of spaceborne synthetic aperture was deeply discussed. This method utilizes the spacecraft ephemeris data and RangeDoppler frequency information of the SAR echo data to produce an estimate of the ground target position ,and algorithm for relative location is derived. Tests were conducted using Radarsat and ERS images and comparing the difference in acquiring orbital slant range and Doppler parameter. This approach has an advantage over previous techniques in that it requires no reference points and is independent of spacecraft attitude knowledge or control.