Repeat-pass interferometric SAR (INSAR) isconsidered an excellent tool to detect very slight earth w t a l movement caused by an earthquake, a volcano activity, and so on. We developed the airborne repeat-pass INSAR system, which can take very precise repeat-pass flight for interferometry, and designed the method getting the highly precise antenna motion using the phases from corner reflectors. In this paper, an outline of our airborne repeat-pass INSAR system, the method of measuring the precise antenna motion data and the first results in a test flight to veri6 the possibility of airborne repeat-pass INSAR are described.
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