Accession Number : ADP007451

Title :   Land Mobile Radio Propagation to Satellites,

Corporate Author : MOTOROLA INC SCHAUMBURG IL

Personal Author(s) : Davidson, Allen

Report Date : FEB 1992

Pagination or Media Count : 20

Abstract : The excess path loss statistics averaged through a 50 Hz bandwidth filter from a satellite to a land mobile platform are shown to be described by two modes, the signal shadowed mode and the two path summation mode. The latter is characterized by a mean near 0 dB and a standard deviation near 2 dB, and the former by a mean that is near 15 dB in the steel canyons of the city, 12 dB in an urban environment, 6.5 dB in a suburban environment and a standard deviation near 5 dB. The characteristics of the signal shadowed mode are very much like traditional terrestrial multipath land mobile propagation. The percent of time spent in each mode is a function of elevation, and varies from 0 percent two path summation when the elevation is near 0 degrees, approaching 100 percent when the elevation is near 90 degrees.

Descriptors :   *ARTIFICIAL SATELLITES, *BANDWIDTH, *PROPAGATION, CANYONS, ELEVATION, ENVIRONMENTS, FILTERS, FUNCTIONS, MEAN, MOBILE, PATHS, PLATFORMS, PROPAGATION, SIGNALS, STANDARDS, STATISTICS, STEEL, TIME, URBAN AREAS, RADIO BEAMS, RADIO RECEPTION.

Subject Categories : Unmanned Spacecraft
      Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE