Propagation measurements for land-mobile satellite systems at 1542 MHz / by J.S. Butterworth. : Co24-3/8-723-1984E-PDF

"A measurement program was undertaken with the objective of providing engineering design data on excess path-loss for potential land-mobile satellite systems operating in the 1500 MHz band. In the suburban and rural areas which could be served by such a system, fading due to multipath propagation and shadowing by terrain obstacles were the two phenomena characterized. Using an omni-azimuth vehicle antenna to receive a signal at 20 degrees elevation from the MARECS A satellite, the diffuse multipath signals were found to be 10 dB less than the direct component. The percentage of shadowed locations on the test routes varied from 5% in open farmland to 33% in suburban locations. The corresponding signal margins required to provide 99% coverage over the various test routes ranged from 12 dB to 21 dB"--Abstract, page 1.

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