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Millstone hill radar: capabilities for s/t observations
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Loriot, G. B. |
| Copyright Year | 1984 |
| Description | During the past several years, the 440-MHz radar at Millstone Hill has been modified to detect coherent echoes from clear-air turbulence in the stratosphere/troposphere (S/T) over the altitude range 4-25 km. Two distinct modes of data acquisition have been developed, and data reduction programs have been completed for one of these modes. This mode (I-mode) transmits a 10 microsec (1.5 km) pulse on the fully steerable antenna. Typically, the antenna is set at a low elevation angle (e.g., 15 deg.) to reduce the altitude resolution to approximately 1 km., and power spectra are collected at some 40 range gates. The antenna may be scanned in azimuth to obtain the total wind vector, held fixed to monitor wave motion, or scanned in elevation to monitor the horizontal extent of the turbulent activity. This steerability gives Millstone a flexible system to focus on localized events, such as lee waves or convective storms. An additional advantage at low elevations is the relatively large Doppler shift of the signal, since the LOS velocity contains a large component of the horizontal velocity. This shift separates the turbulence signal sufficiently far from the ground clutter to allow the spectral moments to be readily inferred. Some 500 hours of S/T I-mode data have been reduced to geophysical parameters, and reside on a data base at Millstone Hill. |
| File Size | 66673 |
| Page Count | 1 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19850024235 |
| Archival Resource Key | ark:/13960/t5fb9wv8w |
| Language | English |
| Publisher Date | 1984-12-01 |
| Access Restriction | Open |
| Subject Keyword | Communications And Radar Atmospheric Circulation Steerable Antennas Meteorological Radar Troposphere Stratosphere Wind Velocity Wind Velocity Measurement Wind Profiles Clear Air Turbulence Radar Scanning Radar Resolution Radio Meteorology Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
