Statistics – Computation
Scientific paper
Jun 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981stin...8226539t&link_type=abstract
Unknown
Statistics
Computation
Over-The-Horizon Radar, Radar Attenuation, Signal To Noise Ratios, Target Acquisition, Transmission Loss, Tropospheric Waves, Bandwidth, Galactic Radiation, Noise Temperature, Radar Antennas, Refractivity
Scientific paper
Computation methods for tropospheric propagation losses in transhorizon propagation are used to provide estimates for the detectability of over-the-horizon targets. Losses depend on frequency, distance, climate, refractivity, and on an empirically derived attenuation function which also takes into account the effects of antenna heights. Equivalent antenna temperatures are assumed to be due to galactic noise. Receiver noise is characterized by noise figure F. Signal-to-noise ratios are illustrated for several target cross-sections as a function of frequency and distance, parametric in antenna heights, distance or frequency, for the median loss 50%, as well as 1, 10, 90, and 99% levels of variability.
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