United States Department of Transportation
i
A differential GPS for determining time-space-position information in support of aircraft noise certification
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2001-01-22
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[PDF-470.42 KB]
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Alternative Title:Institute of Navigation National Annual Meeting
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Abstract:Federal Aviation Regulation (FAR) Part 36, Noise
Standards: Aircraft Type and Airworthiness
Certification, requires that measured aircraft noise
certification data be corrected to a nominal reference-day
condition. This correction process which can be quite
rigorous is typically done for sequential ½-second
acoustic data records measured for a given aircraft noise
certification event. Consequently, the process requires
precise time-space-position-information (TSPI) for each
acoustic data record within each event. Traditionally,
noise certification applicants have used optical
positioning systems such as still cameras and video
cameras, radar, or in rare instances, laser tracking
systems. The accuracy of these systems is typically on
the order of 10 to 20 ft., although the accuracy of laser
tracking systems can be much better. In addition, many
of these traditional systems only provide TSPI data over a
relatively limited time interval in the vicinity of aircraft
overhead, thus requiring extrapolation of TSPI data to
sufficiently define aircraft position for each acoustic data
record within each certification event. With the advent of
differentially corrected global positioning systems
(dGPS), the accuracy and limitations associated with
traditional TSPI systems are easily overcome. This paper
describes a dGPS TSPI system developed by the U.S.
Department of Transportation (DOT) Volpe Center
Acoustics Facility (Volpe). The paper includes
descriptions of both the hardware and software
components of the system. It also details the static and
dynamic system performance.
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