Polarization Diversity Addition to 10 Centimeter Doppler Weather Radar
Title | Polarization Diversity Addition to 10 Centimeter Doppler Weather Radar PDF eBook |
Author | James S. Ussailis |
Publisher | |
Pages | |
Release | 1982 |
Genre | Radar |
ISBN |
Polarization Diversity Addition to the 10 Centimeter Doppler Weather Radar
Title | Polarization Diversity Addition to the 10 Centimeter Doppler Weather Radar PDF eBook |
Author | James S. Ussailis |
Publisher | |
Pages | 81 |
Release | 1984 |
Genre | |
ISBN |
The research performed was that of providing antenna modifications for a polarization diversity addition to the; AFGL 10 centimeter DOPPLER WEATHER RADAR. Described within are the ANTENNA FEED DESIGN (POTTER HORN), the conversion of the antenna form a prime focus to a Cassegrain Configuration, the results of the feed horn RF measurements, the construction of the POLARIZER ASSEMBLY, and the installation and testing of the antenna system. Keywords include: Polarization; Potter horn; Weather radar; Polarized unit; and Antenna testing.
A Polarization Diversity Meteorological Radar System
Title | A Polarization Diversity Meteorological Radar System PDF eBook |
Author | James I. Metcalf |
Publisher | |
Pages | 36 |
Release | 1987 |
Genre | Doppler radar |
ISBN |
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.
Precipitation and Lightning Measurements by Polarization Diversity Radar
Title | Precipitation and Lightning Measurements by Polarization Diversity Radar PDF eBook |
Author | James I. Metcalf |
Publisher | |
Pages | 30 |
Release | 1988 |
Genre | Electromagnetic waves |
ISBN |
Observations of severe convective storms in June 1987 by an 11-cm polarization diversity Doppler radar are described. Specific features include heavy rain, large hail, melting ice particles, lightning, and signal propagation effects. Of particular interest are the first measurements of the polarization differential reflectivity of lightning channels, which reveal the predominant orientations of the channels. Successive radar pulses were transmitted with alternating horizontal and vertical polarization by means of a high-power microwave switch to permit derivation of the differential reflectivity with a small standard error of estimate.
A Polarization Diversity Radar Data Processor
Title | A Polarization Diversity Radar Data Processor PDF eBook |
Author | James I. Metcalf |
Publisher | |
Pages | 0 |
Release | 1983 |
Genre | Electromagnetic waves |
ISBN |
A real time data processor has been designed for use with the AFGL 10-cm Doppler weather radar which is to be operated with alternating transmission of horizontally and vertically polarized signals. In this mode of operation the reception of backscattered signals of polarizations identical to those of the transmitted signals allows the computation of the differential reflectivity between the two polarizations in addition to the absolute reflectivity and the Doppler mean velocity and variance. The switching of transmitted polarization introduces difficulties in the estimation of the autocovariance of the received signals, from which the Doppler velocity parameters are derived. The processor design and the allowed modes of radar operation circumvent these difficulties. This report describes the processing algorithms theoretically and presents details of the implementation of these algorithms in hardware. (Author)
A Polarization Diversity Meteorological Radar System
Title | A Polarization Diversity Meteorological Radar System PDF eBook |
Author | James I. Metcalf |
Publisher | |
Pages | 0 |
Release | 1987 |
Genre | Doppler radar |
ISBN |
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.
Scientific and Technical Aerospace Reports
Title | Scientific and Technical Aerospace Reports PDF eBook |
Author | |
Publisher | |
Pages | 994 |
Release | 1995 |
Genre | Aeronautics |
ISBN |