A model designed to aid in selecting a pulse repetition frequency (PRF) for the Air Traffic Control Radar Beacon System (ATCRBS) has been developed. The model enables the analyst to select the best PRF from among those available for a particular site. This report centers on a discussion of the mechanisms of near-synchronous interference and the various remedies available. Both false-target-inducing near-synchronous replies and transponder lockout are considered. Among the considerations for reducing near-synchronous interference are pulse-repetition-period separations, distance separations between sites with like PRF's, staggered and jittered PRF's, target-detection parameter adjustments, e.g., leading- and trailing-edge thresholds, range-correlation algorithms, and receiver sidelobe suppression. Although all of the methods considered would be helpful in discriminating against near-synchronous interference, the greatest benefits are derived from maintaining at least 35 microseconds separation between pulse repetition periods for interrogator sites with overlapping service volumes.

  • Corporate Authors:

    IIT Research Institute

    10 West 35th Street
    Chicago, IL  United States  60616
  • Authors:
    • Crawford, C R
  • Publication Date: 1976-8

Media Info

  • Pagination: 45 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00175250
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: ECAC-PR-76-030, FAA-RD-77-649E
  • Contract Numbers: F19628-78-C-0006,, DOT-FA70WAI-175
  • Files: NTIS
  • Created Date: Apr 26 2003 12:00AM