Integration of radar altimeter, precision navigation, and digital terrain data for low-altitude flightA Kalman filter for the integration of a radar altimeter into a terrain database-dependent guidance system was developed. Results obtained from a low-altitude helicopter flight test data acquired over moderately rugged terrain showed that the proposed Kalman filter removes large disparities in predicted above-ground-level (AGL) altitude in the presence of measurement anomalies and dropouts. Integration of a radar altimeter makes it possible to operate a near-terrain guidance system at or below 50 ft (subject to obstacle-avoidance limitations), whereas without radar altimeter integration, a minimum clearance altitude of 220 AGL is needed, as is suggested by previous work.
Document ID
19920072588
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Zelenka, Richard E. (NASA Ames Research Center Moffett Field, CA, United States)
Date Acquired
August 15, 2013
Publication Date
January 1, 1992
Subject Category
Aircraft Instrumentation
Report/Patent Number
AIAA PAPER 92-4420
Meeting Information
Meeting: AIAA Guidance, Navigation and Control Conference