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This study presents a contour intersection-based acquisition method for fast and robust terrain referenced navigation (TRN). Due to advances in highly accurate sensors, such as in radar and lasers, the shortcomings of past TRN could be overcome. High-performance sensors have made it possible to estimate the true terrain height limited to narrow error intervals. Digital terrain elevation data is employed...
Controlled Flight Into Terrain (CFIT) is reported as a major cause of today's aircraft accidents. To mitigate these accidents, Predictive Ground Collision Avoidance System (PGCAS) has been used since the mid-70s. In PGCAS algorithm, however, relatively large safety margin for the terrain searching pattern could cause some drawbacks such as nuisance alarms or unnecessary pull-up commands during a tactical...
An approach to vision-based navigation system for autonomous navigation of unmanned aircraft with use of terrain elevation map is addressed. We considered simultaneous localization and mapping (SLAM) algorithm to be the system to which the digital terrain elevation data (DTED) is merged. The proposed algorithm acquires range measurement by line-of-sight (LOS) intersection and provides it to the SLAM...
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