United States Department of Transportation
i
Performance of a Q-M/PSK Data Modem Operating in a Voice and Data Mode Through the ATS-6 Satellite
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1979-02-01
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[PDF-909.44 KB]
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Abstract: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.
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Content Notes:Introduction, Background, System description, Test description, Test results, Summary and conclusions, References
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