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TitleERS-1 synthetic aperture radar repeat-pass interferometry studies: implications for RADARSAT
AuthorVachon, P W; Geudtner, D; Gray, A L; Touzi, R
SourceCanadian Journal of Remote Sensing vol. 21, no. 4, 1995 p. 441-454,
Alt SeriesEarth Sciences Sector, Contribution Series 20041314
PublisherInforma UK Limited
Mediapaper; on-line; digital
File formatpdf
Released2014 08 01
AbstractRepeat-pass Synthetic Aperture Radar (SAR) Interferometry (InSAR) extracts the phase difference from a pair of SAR images acquired at different times. The phase difference may contain information about surface change, which may be contained in the change in scene coherence over the time span between the two images. In this paper, repeat-pass satellite InSAR is reviewed and demonstrated using ERS-1 SAR is reviewed and demonstrated using ERS-1 SAR data. The ERS-1 capability is theoretically extended to the case of Canada's RADARSAT SAR. It is shown that, based on RADARSAT resolution and orbit constraint specifications, the fine-resolution RADARSAT modes are favourable for repeat-pass interferometry. However, a key requirement for RADARSAT InSAR is that scene coherence be retained over the 24-day repeat-pass interval. A methodology for estimating scene coherence over a 24-day time scale is demonstrated using ERS-1 SAR data over two test sites in northern Canada.

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