合成開口レーダ映像法における前方圧縮とレイオーバ現象の一検証

抄録

The topographic distortions, especially fore-shortening and layover phenomena of the Synthetic Aperture Radar (SAR) images are discussed in this paper.
Firstly, for the triangle terrain, degrees of fore-shortening and back-elongation of SAR images in the case of plane-wave illumination and spherical-wave illumination are digested here.
And for the steep triangle terrain, layover and shadow regions are defined and analyzed. Layover and shadowing phenomena closely depend on the off-nadir angle of radar waves.
As a typical example, the image of Mt. Fuji obtained by European Remote Sensing Satellite (EERS-1) SAR with an off-nadir angle of 23 degrees, clearly shows layover phenomena. As an another example, the image of Mt. Fuji obtained by Japanese Earth Resources Satellite (JERS-1) SAR with an off-nadir angle of 35 degrees, shows fore-shortning (non-layover) phenomena.
Both cases are also simulated by a computer and the same results are verified.