A 10 Cm Dual Frequency Doppler Weather Radar
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| Author | : Kenneth J. Banis |
| Publisher | : |
| Total Pages | : 36 |
| Release | : 1982 |
| Genre | : Doppler radar |
| ISBN | : |
A functional description of an automatic radar system performance monitoring network is presented. A network of microprocessor controlled monitoring units were interfaced to various sensors at key areas in a Doppler weather radar in order to collect system status information and display it at a central point near the operator's console. This status information is displayed on a color terminal in a way that allows the systems operator to verify the proper operation of the radar with just a cursory glance at the terminal. Fault location and fault tolerant techniques were employed to provide the system user with quality assured data.
| Author | : Alexander W. Bishop |
| Publisher | : |
| Total Pages | : 48 |
| Release | : 1982 |
| Genre | : Doppler radar |
| ISBN | : |
Design concepts and test results are summarized for a Doppler weather radar system suitable for precipitation measurements over a wide span of radial velocities and slant ranges, even in the presence of ground clutter. The radar transmits two uniform pulse trains at 2.710 and 2.760 GHz. Uniformly spaced pulses permit ground clutter cancellation of up to 50 dB to be achieved with a three-pole elliptic filter. Pulse spacing at one frequency is consistent with long-range coverage in reflectivity, while spacing of the second is consistent with a wide unambiguous velocity measurement span.
| Author | : |
| Publisher | : |
| Total Pages | : 1572 |
| Release | : 1992 |
| Genre | : Aeronautics |
| ISBN | : |
| Author | : James I. Metcalf |
| Publisher | : |
| Total 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.
| Author | : James I. Metcalf |
| Publisher | : |
| Total Pages | : 78 |
| Release | : 1989 |
| Genre | : Radar meteorology |
| ISBN | : |
| Author | : |
| Publisher | : |
| Total Pages | : 68 |
| Release | : 1981 |
| Genre | : Meteorological services |
| ISBN | : |
| Author | : James I. Metcalf |
| Publisher | : |
| Total 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.
| Author | : |
| Publisher | : |
| Total Pages | : 324 |
| Release | : 1982 |
| Genre | : Aeronautical instruments |
| ISBN | : |
| Author | : James I. Metcalf |
| Publisher | : |
| Total Pages | : 44 |
| Release | : 1991 |
| Genre | : Doppler radar |
| ISBN | : |
| Author | : James I. Metcalf |
| Publisher | : |
| Total Pages | : 42 |
| Release | : 1990 |
| Genre | : Doppler radar |
| ISBN | : |
Doppler radars were used to observe a winter coastal storm on 12 February 1988. Measurements of the polarization differential reflectivity by radar yielded information about the changing thermodynamic phase of precipitation as the change from snow to rain progressed northward from the southern New England coast in a strongly stable environment. Doppler velocity measurements by the two radars were used to synthesize the two-dimensional wind fields. These wind fields revealed an upper-level mesoscale trough and ridge moving across the surveillance area during a two-hour period, closely preceding the large-scale clearing of the precipitation, well ahead of the surface low-pressure center. This case represents the first use of these radars for dual-Doppler wind field analysis.
