Accession Number:

AD0718270

Title:

Detailed Analyses of Precipitation Data: FCC/USAF POPSI Project

Descriptive Note:

Corporate Author:

FEDERAL COMMUNICATIONS COMMISSION WASHINGTON DC RESEARCH DIV

Personal Author(s):

Report Date:

1970-12-15

Pagination or Media Count:

50.0

Abstract:

The electromagnetic field strength measurements obtained during the 1966 FCCUSAF POPSI Project have been classified according to propagation mode and the data from periods of precipitation have been analyzed in detail. Cumulative probability distributions were generated for the effective radar reflectivities derived from the bistatic electromagnetic measurements and compared with the probability distributions of the surface rainfall rates derived from the accumulations of the United States Weather Bureau recording rain gauges in the area. The distribution functions were then adjusted by means of a least squares regression line. The relationship thus obtained has been compared with other Z-R relationships based upon the analysis of drop size distributions and has been tested against independent rain gauge data in the POPSI Project area. The final approximation resulted in a standard deviation for estimating Zp from Rp of less than 1.6 dB for the New Jersey rainfall data. The altitude dependence of the reflectivity from precipitation-connected phenomena in the New Jersey coastal area has been demonstrated and discussed to some extent.

Subject Categories:

  • Meteorology
  • Radiofrequency Wave Propagation

Distribution Statement:

APPROVED FOR PUBLIC RELEASE