Coherent Polarization-diversity Radar Measurements of Clouds and Precipitation - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Coherent Polarization-diversity Radar Measurements of Clouds and Precipitation write by Jim D. Echard. This book was released on 1981. Coherent Polarization-diversity Radar Measurements of Clouds and Precipitation available in PDF, EPUB and Kindle.
Design Study for a Coherent Polarization-Diversity Radar
Design Study for a Coherent Polarization-Diversity Radar - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Design Study for a Coherent Polarization-Diversity Radar write by James I. Metcalf. This book was released on 1980. Design Study for a Coherent Polarization-Diversity Radar available in PDF, EPUB and Kindle. Design concepts for a coherent polarization-diversity radar are presented. The desired capability is the measurement of microphysical parameters of hydrometeors, including thermodynamic phase, shape, size, orientation, and number density. The postulated use of a polarization-diversity radar is based on the relationships of these parameters to the anisotropy of the scattering and propagation media. The measurement objectives lead to the specification of primary and secondary coverage regions. Target detection within the primary region (less than 40 km range) and propagation effects lead to the specification of S-band and Ka-band as optimum frequency bands for observations of precipitation and clouds, respectively. Radar system parameters are specified, and schematic diagrams of system hardware are presented. Antenna design concepts and practical considerations are discussed. We discuss concepts of data processing and a possible computer-oriented implementation of radar control and data processing. (Author).
Precipitation and Lightning Measurements by Polarization Diversity Radar
Precipitation and Lightning Measurements by Polarization Diversity Radar - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Precipitation and Lightning Measurements by Polarization Diversity Radar write by James I. Metcalf. This book was released on 1988. Precipitation and Lightning Measurements by Polarization Diversity Radar available in PDF, EPUB and Kindle.
A Polarization Diversity Meteorological Radar System
A Polarization Diversity Meteorological Radar System - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook A Polarization Diversity Meteorological Radar System write by James I. Metcalf. This book was released on 1987. A Polarization Diversity Meteorological Radar System available in PDF, EPUB and Kindle. The AFGL 10-cm Doppler weather radar was modified to enable the measurement of the differential reflectivity between horizontal and vertical polarizations in addition to the absolute reflectivity and the Doppler mean velocity and spectrum variance. Polarization switching is achieved by means of a diplexer, which separates at the antenna the transmitted signals of two frequencies, 2710 and 2760 MHz, and permits nearly simultaneous transmission of signals of orthogonal polarizations. Signals of these frequencies can be transmitted either with horizontal and vertical polarization, respectively, or with left and right circular, polarization, respectively. We describe the design and performance of the diplexer and the performance of the real-time data processor, present examples of meteorological measurements, and discuss future developments of the radar system. Keywords: Polarization diversity weather radar, Dual polarization radar, and Polarization switching.
Simulation and Interpretation of Polarization Diversity Radar Spectral Functions
Simulation and Interpretation of Polarization Diversity Radar Spectral Functions - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Simulation and Interpretation of Polarization Diversity Radar Spectral Functions write by James I. Metcalf. This book was released on 1983. Simulation and Interpretation of Polarization Diversity Radar Spectral Functions available in PDF, EPUB and Kindle. A numerical model was developed to simulate the power spectra, cross-spectrum, and derived functions obtainable from a coherent polarization diversity radar. The model was used to investigate the effects of air velocity variance, differential propagation, and noise on the spectral functions. Input parameters include radar wavelength, elevation angle, air velocity variance, rainfall rate, propagation distance, fraction of scatterers having a preferred orientation, and relative noise level. Results of calculations for 8.6 mm and 7.5 cm wavelengths are illustrated. These are compared with the functional forms obtained from theory and discussed in terms of the meteorological information derivable from them. The forms of the spectral power ratio and the cross-spectral amplitude ratio are strongly affected by air velocity variance and by noise. However, it appears possible to derive a good estimation of the Doppler air velocity from the power spectra. The cross-spectral amplitude ratio may be of more general value in analysis than previously thought, because its Doppler velocity domain is greater than that of the spectral power ratio in the presence of radar system noise. The absolute error of the propagation term estimated from the cross-spectral amplitude ratio is not strongly dependent on the rainfall rate or propagation distance.
