RFI Propagation Paths

Details RFI Propagation Paths RFI Propagation Paths

Jun 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004smra.conf..191f&link_type=abstract

Spectrum Management for Radio Astronomy, Proceedings of the IUCAF summer school Held at Green Bank, West Viginia, June 9-14, 200

Astronomy and Astrophysics

Astronomy

Scientific paper

Protection of radio observatories from RFI from ground-based transmitters generally relies on great circle path diffraction calculations to predict signal strengths at the radio telescopes. However, signal propagation over long distances and over rough terrain is considerably more complex than two-dimensional models assume. This is a brief description of a study of radar signal propagation paths that we have been conducting at Green Bank. Signal reflections from surrounding terrain, aircraft, and rain showers have been observed with extra propagation delays of up to several hundred microseconds and a wide range of directions of arrival. Propagation losses through indirect paths can sometimes be comparable or occasionally less than the great circle path loss. The range of delay and directions of arrival have implications for the signal processing requirements of RFI cancellation techniques now under study.

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