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Proceedings Paper

APALS program status: preproduction flight test results and production implementation
Author(s): James J. Hvizd; Otto W. Dieffenbach
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Paper Abstract

The APALS system is a precision approach and landing system designed to enable low visibility landings at many more airports than now possible. Engineering development of the APALS system began October 1992 culminating in the pre- production Advanced Development Model (ADM) system currently undergoing flight testing. The paper focuses on the Cat III accuracy and integrity requirements defined by ICAO, Annex 10 and the required navigation performance (RNP) tunnel concept. The resulting ADM architecture developed to meet them is described. The primary measurement is made with the aircraft's weather radar and provides range and range rate information to the ADM necessary to update the precision navigation state vector. The system uses stored terrain map data as references for map matching with synthetic aperture radar with synthetic aperture radar maps. A description of the pre-production flight test program is included. Testing is being conducted at six different airports around the country demonstrating system performance in various environmental conditions (precipitation, heavy foliage, sparse terrain, over water and turbulence). ADM flight test results of 131 successful CAT II hand-flown approaches at ALbuquerque, NM and Richmond, VA are presented. Detailed statistical analysis of these results indicate that the APALS system meets the RNP for Cat III.

Paper Details

Date Published: 27 May 1996
PDF: 8 pages
Proc. SPIE 2737, Air Traffic Control Technologies II, (27 May 1996); doi: 10.1117/12.241061
Show Author Affiliations
James J. Hvizd, Lockheed Martin Advanced Development Operations (United States)
Otto W. Dieffenbach, Lockheed Martin Advanced Development Operations (United States)

Published in SPIE Proceedings Vol. 2737:
Air Traffic Control Technologies II
Robert G. Otto; James Lenz; Russell Targ, Editor(s)

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