Accession Number : ADA017085

Title :   Performance Evaluation of Data Modems for the Aeronautical Satellite Channel.

Descriptive Note : Interim rept. Aug 74-Jun 75,

Corporate Author : TRANSPORTATION SYSTEMS CENTER CAMBRIDGE MASS

Personal Author(s) : Duncombe,C. B. ; Salwen,H.

Report Date : SEP 1975

Pagination or Media Count : 41

Abstract : Several modems and satellite subsystems were tested with the aid of an aeronautical channel simulation facility. The modems tested included a high performance DPSK modem, a high performance CPSK modem, two hybrid voice/data modems, and a lower performance CPSK modem. Data Performance results are presented in the form of Probability of Bit Error versus Signal to Noise Density and Signal to Multipath Ratios with Doppler Spread as a parameter. Some tests were conducted with a hard limiting IF processor in cascade with the channel simulator to simulate satellite characteristics. The characteristics of the aeronautical satellite channel simulator are also described. The discussion concludes with a general evaluation of the effect of aeronautical satellite channel characteristics on modem performance, as derived from the simulation experiments. (Author)

Descriptors :   *Satellite communications, *Modems, *Data links, Aircraft, Computerized simulation, Voice communications, Doppler effect, Signal processing, Signal to noise ratio, Pulse duration modulation, Phase shift keyers, L band, Multipath transmission

Subject Categories : Flight Control and Instrumentation
      Unmanned Spacecraft
      Radio Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE