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Suppression of biodynamic interference in head-tracked teleoperationThe utility of helmet-tracked sights to provide pointing commands for teleoperation of cameras, lasers, or antennas in aircraft is degraded by the presence of uncommanded, involuntary heat motion, referred to as biodynamic interference. This interference limits the achievable precision required in pointing tasks. The noise contributions due to biodynamic interference consists of an additive component which is correlated with aircraft vibration and an uncorrelated, nonadditive component, referred to as remnant. An experimental simulation study is described which investigated the improvements achievable in pointing and tracking precision using dynamic display shifting in the helmet-mounted display. The experiment was conducted in a six degree of freedom motion base simulator with an emulated helmet-mounted display. Highly experienced pilot subjects performed precision head-pointing tasks while manually flying a visual flight-path tracking task. Four schemes using adaptive and low-pass filtering of the head motion were evaluated to determine their effects on task performance and pilot workload in the presence of whole-body vibration characteristic of helicopter flight. The results indicate that, for tracking tasks involving continuously moving targets, improvements of up to 70 percent can be achieved in percent on-target dwelling time and of up to 35 percent in rms tracking error, with the adaptive plus low-pass filter configuration. The results with the same filter configuration for the task of capturing randomly-positioned, stationary targets show an increase of up to 340 percent in the number of targets captured and an improvement of up to 24 percent in the average capture time. The adaptive plus low-pass filter combination was considered to exhibit the best overall display dynamics by each of the subjects.
Document ID
19910011821
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Lifshitz, S. (Technion - Israel Inst. of Tech. Haifa., United States)
Merhav, S. J. (Technion - Israel Inst. of Tech. Haifa., United States)
Grunwald, A. J. (Technion - Israel Inst. of Tech. Haifa., United States)
Tucker, G. E. (NASA Ames Research Center Moffett Field, CA., United States)
Tischler, M. B. (Army Aviation Systems Command Moffett Field, CA., United States)
Date Acquired
September 6, 2013
Publication Date
January 1, 1991
Subject Category
Aircraft Instrumentation
Report/Patent Number
A-91058
NAS 1.15:103833
NASA-TM-103833
AVSCOM-TR-90-A-005
Meeting Information
Meeting: European Rotorcraft Forum
Location: Glasgow
Start Date: September 18, 1990
End Date: September 20, 1990
Accession Number
91N21134
Funding Number(s)
PROJECT: RTOP 505-68-84
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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