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PERFORMANCE OF A Q-M/PSK DATA MODEM OPERATING IN A VOICE AND DATA MODE THROUGH THE ATS-6 SATELLITE

Experiments were conducted in cooperation with the Communications Research Center (CRC) of Canada to gather additional performance data on the error statistics of the digital data channel of the Q-M/PSK Voice and Data Modem, while operating in the hybrid (simultaneous) voice and data mode. These data are to supplement the data collected in the 1974-75 ATS-6 satellite tests to provide additional information about the performance of the data portion of the modem when operating in a gaussian noise (no multipath) environment. Flight tests were conducted from 14 to 24 March 1977, in three locations: two in Canada at a 9 deg. elevation angle to the satellite and one near Bermuda at a 5 deg. elevation angle. Signals were transmitted from the Communications Research Center ground station at L-Band (1650 MHz) to the ATS-6 where they were relayed to the aircraft at 1550 MHz and received and recorded for post-flight tests. All flight tests were successfully completed and a large amount of data were collected. Results indicate a bit error rate on the order of 2 dB closer to theoretical for DECPSK than in the previous ATS-6 tests, and in close agreement with laboratory and acceptance test data. (Author)

  • Corporate Authors:

    Transportation Systems Center

    55 Broadway, Kendall Square
    Cambridge, MA  United States  02142
  • Authors:
    • Golab, J
    • Duncombe, C
  • Publication Date: 1978-2

Media Info

  • Pagination: 29 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00175985
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: TSC-FAA-77-28, FAA-RD-78-6
  • Contract Numbers: DOT-TSC-531
  • Files: NTIS
  • Created Date: Jul 19 2002 12:00AM