GROUND SURFACE VARIATION MEASURING METHOD USING SYNTHETIC APERTURE RADAR

摘要

PPROBLEM TO BE SOLVED: To highly accurately find actual variations along the ground surface at a measuring objective point for landslide presage observation etc. by using a synthetic aperture radar mounted on a flying body. PSOLUTION: This method is for finding the variations of the ground surface by performing synthetic-aperture interference processing on a ground-surface reflection wave of a pulse-like radio wave emitted from the one synthetic aperture radar 18 mounted on the flying body 16. A tower-type substrate 20 of rigid structure is provided on the ground surface 10 being a measuring object. One radio-wave reflecting body 12a is installed so as to reflect a synthetic aperture radar radio wave on an ascending track while the other radio-wave reflecting body 12b so as to reflect that on an descending track. The reflected radio waves obtained two times each on the ascending and descending tracks are synthetic-aperture interference processed, thereby severally finding distances from the ascending and descending tracks to the measuring objective point. The actual variations of the measuring object point from a past position is found by including conditions on fluctuating directions of the ground surface determined by soil structure. PCOPYRIGHT: (C)2005,JPO&NCIPI