An algorithm for estimating rain rate by a dualfrequency radar
Abstract
This paper concerns an estimation algorithm of rain rates for a dualfrequency radar at rainattenuating bands. The estimations are made based on the concept of least squares. In the algorithm, the ratios of received echo powers at adjacent range bins at each frequency are used to eliminate some unknown and/or undetermined factors, such as radar calibration factors. The algorithm, which is applicable when a part of echoes at one frequency is missing due to rain attenuation, is also developed. In the estimation algorithm, the relationship between specific attenuation and rain rate (kR relationship), and that between effective Z factor and rain rate (ZR relationship), are assumed to be expressed by the usual power law form. The kR relationships are fixed; however, the ZR relationships are expressed by the least squares regression form in terms of the measured quantities and the rain rates. The results of computer simulation experiments are described to demonstrate the validity of the present algorithm.
 Publication:

Radio Science
 Pub Date:
 October 1983
 DOI:
 10.1029/RS018i005p00697
 Bibcode:
 1983RaSc...18..697F
 Keywords:

 Atmospheric Attenuation;
 Radar Attenuation;
 Radar Measurement;
 Rain Gages;
 Signal Processing;
 Algorithms;
 Computerized Simulation;
 Estimating;
 Least Squares Method;
 Regression Analysis;
 Communications and Radar