A survey was conducted to determine the suitability of using the 800-900 MHz band as the primary carrier of digital communication data pertaining to the Multi-User AVM (Automatic Vehicle Monitoring) Program. Testing was conducted on the six selected routes of the Southern California Rapid Transit District (SRTD) and specified wide area segments in the city of Los Angeles. The field testing involved usage of a test vehicle, communication equipment, both on the vehicle and at the base station, and data acquisition equipment. Results on the area coverage, large and small scale signal variations, message error mechanisms, antenna polarizations, usage of different base station sites, usage of different baud rates, and comparison with model prediction were obtained. The study also involved taking field measurements of such parameters as the noise level, the signal level, signal/noise ratio, throughput, and message errors. The results of the 800 MHz Survey indicate that: (1) Multiple base stations will be required to provide the specified coverage of the six selected SCRTD bus routes; (2) the results indicate that the use of a circularly polarized antenna system does not reduce the effects of fast fades compared to a vertically polarized antenna system; and (3) Baud rates between 1000 and 1800 BPS can be used effectively for the transmission of digital data using commercial 800 MHz mobile radios presently on the market.

  • Corporate Authors:

    Gould Information Identification Incorporated

    Fort Worth, TX  USA 

    Transportation Systems Center

    55 Broadway, Kendall Square
    Cambridge, MA  USA  02142

    Urban Mass Transportation Administration

    400 7th Street, SW
    Washington, DC  USA  20590
  • Authors:
    • Balaram, A
    • Heathcock, W
    • Hajovsky, R
  • Publication Date: 1979-3

Media Info

  • Pagination: 108 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00197449
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: DOT-TSC-UMTA-79-11
  • Contract Numbers: DOT-TSC-1237
  • Files: NTIS, TRIS, USDOT
  • Created Date: Jul 31 2002 12:00AM