Estimating radar beam blockage from thermal noise with verification by precipitation coverage
Another proxy for percent beam blockage is derived from precipitation signatures integrated over an extended period of time. The idea is that for long integration periods, the amount of precipitation over a radar scene should be about equal for all locations. Areas with partial beam blockage will show measurably less precipitation. Beam blockage can also be estimated from the physical environment (visually or photgrammetrically ), as well from direct reflectivity measurements.
This paper examines all of these beam-blockage estimators and inter-compares them. Experimental data from NCAR's S-Pol radar taken during the DYNAMO field experiment in the Indian Ocean are used to illustrate the techniques.