Vertical SAR imaging for high altitude altimetric navigation resetting

Konferenz: EUSAR 2016 - 11th European Conference on Synthetic Aperture Radar
06.06.2016 - 09.06.2016 in Hamburg, Germany

Tagungsband: EUSAR 2016

Seiten: 4Sprache: EnglischTyp: PDF

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Cantalloube, Hubert M. J. (ONERA, France)

Altimetric resetting is an autonomous navigation techniques that matches a radio altimeter profile and a digital elevation model of the area flown over in order to provide an update to an inertial navigation unit. It is applied in case external navigation aids as GPS or radio beacons are unavailable or jammed, but is limited to terrain with adequate texture (hardness) and low altitude flight because of the limited angular resolution of the radio altimeter. For high flight altitude, using a vertical synthetic aperture radar instead of a radio altimeter yields an high ground resolution along track, though the across-track resolution remains that of the real antenna. Low cross-track resolution, however, does not alone prevents using the altimetric resetting technique, but it entails extra computational costs. The extra computation can nevertheless be prepared before the mission for a given flight altitude and heading.