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Civil helicopter flight operations using differential GPSThe results of NASA flight trials of a dual-receiver differential global positioning system (DGPS) for civilian helicopter navigation applications, are presented. The three principal components of the DGPS system are described, including the GPS ground-reference system, a range tracking system, and an on-board sequential GPS receiver. The ground-based receiver in the DGPS operates at a known fixed location and receives C/A code signals from NAVSTAR satellites. System bias errors in the ground receiver are subtracted from the airborne solution for the navigational fix. Calculations of the differential bias error are carried out using an on-board PDP-11/34 M research computer. The ground-reference differential corrections for satellites are given in a table. It is shown that the differential correction signal of the DGPS contains only a small (0.1 rad/sec) high-frequency component which can be attributed to system error. A schematic diagram of the DGPS postflight data processing routine is provided.
Document ID
19860041771
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Edwards, F. G.
(NASA Ames Research Center Moffett Field, CA, United States)
Loomis, P. V. W.
(TAU Corp. Los Gatos, CA, United States)
Date Acquired
August 12, 2013
Publication Date
January 1, 1985
Subject Category
Aircraft Communications And Navigation
Accession Number
86A26509
Distribution Limits
Public
Copyright
Other

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