CORRECTION PROCEDURES FOR AIRCRAFT NOISE DATA. VOLUME III. FILTER EFFECTS

A method has been developed to quantify errors in measurement, correction and extrapolation of aircraft noise data which are attributable to spectrum slope and nonideal filter transmission characteristics. The method's fundamental basis is an iterative calculation scheme which recovers an estimate of the true spectrum shape of a signal from its measured band levels. This 'true' spectrum can then be extrapolated to other distances or have frequency dependent corrections made to it on an exact basis without need for worry about filter or slope errors. The new spectrum may then be re-integrated to produce band levels suitable for input to EPNdB or PNL calculations. Applying this procedure to real flyover data and comparing the resultant values of EPNL with those using FAR Part 36 procedures showed only small differences usually. However, the technique provides a consistent method for the analysis of errors due to these sources and should be useful for estimating their magnitude in the future. (Author)

  • Supplemental Notes:
    • See also Volume 4, AD-A083 075.
  • Corporate Authors:

    Wyle Laboratories

    128 Maryland Street
    El Segundo, CA  USA  90245

    Federal Aviation Administration

    800 Independence Avenue, SW
    Washington, DC  USA  20591
  • Authors:
    • SUTHERLAND, L C
  • Publication Date: 1980-7

Media Info

  • Pagination: 93 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00327739
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: WR-79-9-VOL-3, FAA/EE-80-1-VOL-3
  • Contract Numbers: DOT-FA78WA-4143
  • Files: NTIS, USDOT
  • Created Date: Feb 18 2002 12:00AM