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Proceedings Paper

OASYS laser radar characterization of natural and manmade terrestrial features
Author(s): Robert J. Grasso; Adam C. P. Pratty; Christopher M. Vann; Clinton G. Stimson; James E. Ackleson
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Paper Abstract

Performance of the Northrop Grumman Obstacle Avoidance Laser Radar System (OASYS) has been characterized against various terrestrial targets. OASYS is capable of discriminating and identifying objects from a complementary background as well as producing high-resolution laser radar imagery. Its primary function alerts pilots to obstacles in a helicopter flight path; thus, allowing evasive maneuvers to be performed to avoid collision. Primary obstacles encountered are: (1) wires; (2) trees; (3) transmission towers; (4) vertical poles; (5) structures, and; (6) terrain. Of these, wires are the most difficult to detect due to their small cross section. A simple, but very effective object identification algorithm is utilized which unerringly communicates large volumes of detected object data to the pilot, or to the recording computer for later analysis. In the program reported here, laser radar images of various terrestrial objects were obtained and their properties measured. In this manner a database of object signatures, cross-sections, and images is obtained. These objects include: (1) wires of various diameter and reflectivity; (2) trees and vegetation; (3) large and small vertical objects including transmission towers and poles; (4) buildings and structures, and (5) various terrain types.

Paper Details

Date Published: 28 December 1999
PDF: 12 pages
Proc. SPIE 3870, Sensors, Systems, and Next-Generation Satellites III, (28 December 1999); doi: 10.1117/12.373226
Show Author Affiliations
Robert J. Grasso, Northrop Grumman Corp. (United States)
Adam C. P. Pratty, Defence Evaluation and Research Agency (United Kingdom)
Christopher M. Vann, Defence Evaluation and Research Agency (United Kingdom)
Clinton G. Stimson, Defence Evaluation and Research Agency (United Kingdom)
James E. Ackleson, Northrop Grumman Corp. (United States)

Published in SPIE Proceedings Vol. 3870:
Sensors, Systems, and Next-Generation Satellites III
Hiroyuki Fujisada; Joan B. Lurie, Editor(s)

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