TIME REFERENCE SCANNING BEAM MULTIMODE DIGITAL PROCESSOR

Landing system simulations have been carried out in support of the Microwave Landing System (MLS) program of the Federal Aviation Administration. The results of these simulations have been published in an interim report and in Calspan Technical Notes. This report contains the results of extensive simulation evaluations of a multimode digital processor developed for the time reference scanning beam (TRSB) system. Four processing algorithms were developed for the TRSB system. Simulation tests showed that the algorithms developed for the dwell gate processor were less sensitive to multipath errors and had less processing noise than the flight test phase 3 receivers. The split gate processor had smaller multipath and noise errors than the dwell gate processor. Two asymmetrical processing algorithms were implemented that had multipath errors of less than half the magnitude of the dwell gate or split gate techniques. The single edge processor (SEP) is effective for reducing elevation multipath errors from hangar reflections and ground reflections in flare data. An adaptive SEP was developed that can be used for azimuth or elevation data and is effective in reducing errors from multipath that occurs on either edge of the beam. The algorithms for the four processing modes were implemented in an LSI-11 microprocessor packaged for convenient field and flight tests.

• Corporate Authors:

  Calspan Corporation

  4455 Genesee Street
  Buffalo, NY  United States  14225
• Authors:
  • Beneke, J
  • Wightman, C W
  • Vallone, C B
  • Offt, A M
• Publication Date: 1978-4

Media Info

• Pagination: 74 p.

Subject/Index Terms

• TRT Terms: Algorithms; Analog to digital converters; Microcomputers; Microwave devices; Microwave landing systems; Multipath transmission; Radar receivers; Radio receivers; Signal processing; Simulation
• Uncontrolled Terms: C band

Filing Info

• Accession Number: 00181943
• Record Type: Publication
• Source Agency: National Technical Information Service
• Report/Paper Numbers: CALSPAN-AG-5580-E-2, FAA-RD-78-84
• Contract Numbers: DOT-FA74WA-3445
• Files: NTIS
• Created Date: Nov 14 2002 12:00AM