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Experimental determination of the navigation error of the 4-D navigation, guidance, and control systems on the NASA B-737 airplaneNavigation error data from these flights are presented in a format utilizing three independent axes - horizontal, vertical, and time. The navigation position estimate error term and the autopilot flight technical error term are combined to form the total navigation error in each axis. This method of error presentation allows comparisons to be made between other 2-, 3-, or 4-D navigation systems and allows experimental or theoretical determination of the navigation error terms. Position estimate error data are presented with the navigation system position estimate based on dual DME radio updates that are smoothed with inertial velocities, dual DME radio updates that are smoothed with true airspeed and magnetic heading, and inertial velocity updates only. The normal mode of navigation with dual DME updates that are smoothed with inertial velocities resulted in a mean error of 390 m with a standard deviation of 150 m in the horizontal axis; a mean error of 1.5 m low with a standard deviation of less than 11 m in the vertical axis; and a mean error as low as 252 m with a standard deviation of 123 m in the time axis.
Document ID
19780018128
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Knox, C. E.
(NASA Langley Research Center Hampton, VA, United States)
Date Acquired
August 9, 2013
Publication Date
April 1, 1978
Publication Information
Publication: AGARD Guidance and Control Design Considerations for Low-Altitude and Terminal-Area Flight
Subject Category
Aircraft Communications And Navigation
Accession Number
78N26071
Distribution Limits
Public
Copyright
Other
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