A COMPARISON OF MEASURED DATA AND ITS MODEL PREDICTIONS

The Institute of Telecommunication Sciences (ITS) has developed for the Federal Aviation Administration (FAA), a computer model (IF-77) which predicts signal strengths, desired-to-undesired signal ratios, and a variety of other radio propagation related outputs. The model is periodically updated as ITS improves its prediction capability. The model was last validated by FAA about 10 years ago. Since a number of changes have been made to the model since then, revalidation is not inappropriate. In this Report, propagation predictions are compared with VOR and TACAN signal strength measurements taken on 20 VORTAC's in the Southwest Region of the United States. This comparison confirms once again, that the ITS/FAA model accurately predicts VOR and TACAN signal strength. (Author)

• Corporate Authors:

  Federal Aviation Administration

  Systems R&D Service, 800 Independence Avenue, SW
  Washington, DC  United States 
• Authors:
  • Smith, R D
• Publication Date: 1978-1

Media Info

• Pagination: 284 p.

Subject/Index Terms

• TRT Terms: Alternatives analysis; Electrical measurement; Electromagnetic wave propagation; Field strength; Mathematical models; Mathematical prediction; Radio navigation; Tactical air navigation system; Very high frequency
• Uncontrolled Terms: Models
• Old TRIS Terms: Field intensity
• Subject Areas: Data and Information Technology;

Filing Info

• Accession Number: 00175991
• Record Type: Publication
• Source Agency: National Technical Information Service
• Report/Paper Numbers: FAA-RD-77-106
• Files: NTIS, USDOT
• Created Date: Jul 19 2002 12:00AM