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Helicopter Approach Capability Using the Differential Global Positioning SystemThe results of flight tests to determine the feasibility of using the Global Positioning System (GPS) in the Differential mode (DGPS) to provide high accuracy, precision navigation and guidance for helicopter approaches to landing are presented. The airborne DGPS receiver and associated equipment is installed in a NASA UH-60 Black Hawk helicopter. The ground-based DGPS reference receiver is located at a surveyed test site and is equipped with a real-time VHF data link to transmit correction information to the airborne DGPS receiver. The corrected airborne DGPS information, together with the preset approach geometry, is used to calculate guidance commands which are sent to the aircraft's approach guidance instruments. The use of DGPS derived guidance for helicopter approaches to landing is evaluated by comparing the DGPS data with the laser tracker truth data. The errors indicate that the helicopter position based on DGPS guidance satisfies the International Civil Aviation Organization (ICAO) Category 1 (CAT 1) lateral and vertical navigational accuracy requirements.
Document ID
Document Type
Kaufmann, David N. (California State Polytechnic Coll. San Luis Obispo, CA United States)
Date Acquired
August 17, 2013
Publication Date
April 1, 1994
Subject Category
Aircraft Communications and Navigation
Report/Patent Number
NAS 1.26:202391
Funding Number(s)
PROJECT: Cal Poly Proj. 5328
Distribution Limits
Work of the US Gov. Public Use Permitted.
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