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ATD'S 1995 Collection


S-POL

S-Band Polarized Radar
"It's an ingenious solution to a big radar problem."--Dave Carlson

Photo of S-POL
(Left to right) John Lutz, Al Phinney, and Brian Lewis are collaborating on the modular S-POL design. The radar's transmitter is the black cylinder just to Jack's right. (Photo by Carlye Calvin.)

Who's Involved: Jon Lutz, project lead; Paul Johnson, fabrication and design lead; Jack Fox, creator of fundamental design; Jeff Keeler and Craig Walther, other contributions
What It Is: Portable, polarized Doppler radar that allows the horizontal and vertical components of returning signals to be measured, thus permitting hail and other storm features to be detected
Claim to Fame: S-POL promises to be the most portable large Doppler radar ever. It is being assembled with parts from an older Doppler radar of the National Severe Storms Laboratory. The entire package fits into six 8- x-8-x-20-foot seatainers for shipment. Four of those seatainers then serve as a base for the radar transmitter/receiver.
First Deployment: Expected this fall in the Maritime Continent Thunderstorm Experiment (MCTEX), which will study tropical convection over Tiwi Island, just north of Darwin, Australia.


Zebra

Data integration and processing system
"Zebra [pronounced with a short e, formerly called Zeb] proved itself at the TOGA COARE data workshop." --Dave Carlson

Photo of Zebra
Zebra and its user-friendly graphics helped earn Jon Corbet NCAR's 1994 Technical Support Award. (Photo by Bob Bumpas.)

Who's Involved: Jon Corbet, lead; Cindy Mueller, scientific lead; Anne- Leslie Barrett, Chris Burghart, Kris Gould, Gary Granger, and Rebecca Sobol, developers
What It Is: A system allowing researchers to view and work with disparate types of data in a single graphical interface
Claim to Fame: The vast array of instrumentation in modern field projects required a method by which project scientists could sift through various types of data quickly, both in real-time and post-processing modes. Zeb's software was completed in 1990 for the Convection and Precipitation/Electrification Experiment (CaPE). It has since found use in many field projects and in the ongoing Atmospheric Radiation Measurement (ARM) program of the U.S. Department of Energy. Zebra was in the spotlight at the TOGA COARE data workshop held last fall in Toulouse, France, which was among the first scientific meetings to provide intensive, on-site analysis and display of the data at hand.
First Deployment: Zebra isn't new, but it is continually being refined and its popularity continues to grow. Full documentation is available on ATD's World Wide Web server.


Enhanced ISS

Integrated Sounding System

"Faster and more accurate is the goal"--Dave Parsons
Photo of Enhanced ISS
Dave Parsons (seated) and Hal Cole examine output from the enhanced ISS. (Photo by Bob Bumpas.)

Who's Involved: Hal Cole, Charlie Martin, and Dave Parsons, ISS developers; Stephen Cohn, signal processing
What It Is: A modular system that takes surface and upper-air readings of wind, temperature, moisture, and other variables as often as every 30 minutes, using profilers (clear air radars) and other instruments
Claim to Fame: ISS made its successful debut in the Tropical Ocean and Global Atmosphere Program's Coupled Ocean-Atmosphere Response Experiment (TOGA COARE) in 1992-93. Now the ISS group is enhancing the system in two ways:


First Deployment: The lidar is still in development, with an airborne deployment planned this fall. The new profiler technique, whose development is supported by the U.S. Department of Energy, has already been tested through the Atmospheric Radiation Measurement program. It will be deployed this May for comparisons with observations from a NOAA tower near Erie, Colorado.


PAM III

Third-generation Portable Automated Mesonet
"We'll be able to get fluxes from places like the Mongolian grasslands or the Tibetan plateau"--Dave Carlson

Photo of PAM III
Tom Horst with the PAM III prototype. (Photo by Carlye Calvin.)

Who's Involved: Tom Horst, lead; Matt Michaelis, John Militzer, Scott Norris, and Steve Semmer, primary contributors
What It Is: Network of 30 upgraded surface meteorological stations
Claim to Fame: PAM's first and second generations were deployed on projects worldwide from 1978 to 1992. Almost five dozen compact, solar- powered stations gathered basic meteorological data and relayed the data via satellite. The upgraded PAM III stations feature sensors with higher accuracy, lower maintenance, faster satellite data transmission, and the ability to measure solar radiation and frozen precipitation. Ten of the new stations will be Flux-PAMs, measuring the vertical transport of heat, water vapor, momentum, trace gases, and net radiation.
First Deployment: A prototype is being tested at the Marshall site this winter. Three prototypes will be deployed in Florida this summer to support the Small Cumulus Microphysics Study.


GPS Dropwindsonde

Global Positioning System navigation for dropwindsonde
"We're trying to make it lighter in weight and smaller in size"--Dean Lauritsen

Photo of Dean Lauritsen, Ken Norris
Compact electronics are a major part of dropwindsonde upgrading. Dean Lauritsen (left) and Ken Norris are now at work on the GPS dropwindsonde. (Photo by Bob Bumpas.)

Who's Involved: Hal Cole, project manager; Terry Hock and Ken Norris, hardware design; Dean Lauritsen, data system design
What It Is: Small parachute-borne instrument package dropped from airplanes to take measurements over oceans and other regions where launching weather balloons (radiosondes) from the ground is impractical.
Claim to Fame: In the early 1970s, NCAR developed the first research dropwindsonde used globally in field programs and by NOAA and the U.S. Air Force to track and study hurricanes. The Omega-based navigation system for these sondes is being discontinued in the late 1990s. Technology now permits smaller, lighter, and more accurate sensors, along with navigation via GPS satellites. A much narrower bandwidth for transmitting signals from sonde to plane will allow for savings in battery power, weight, and frequency spectrum. The new unit will require only 10% of the transmitting power of its predecessor (one-tenth watt versus one watt), and at around 0.4 kilograms, its weight is one-quarter of the Omega sonde's.
First Deployment: Likely to occur from NOAA's new high-altitude Gulfstream IV during the 1996 hurricane season, with possible deployment from NCAR's RB-57 or C-130 before then. The dropsonde-- cosponsored by NCAR, NOAA, and the German Aerospace Research Establishment (DLR)--will see eventual use in NOAA's P-3 and G-4 planes and in DLR's new stratospheric research aircraft, which can reach heights of nearly 24 kilometers. ATD and DLR are exploring development of an ozone sensor for polar research.


BINET

Bistatic Doppler radar receiver network
"Other places are setting up their own networks based on this one."--Dave Carlson

Photo of BINET
The four-meter-high BINET antenna, tested atop FL1, towers over Josh Wurman. (Photo by Carlye Calvin.)

Who's Involved: Josh Wurman (now at the University of Oklahoma), development; Chuck Frush, Chris Holloway, and Mitch Randall, prototyping
What It Is: Network of low-cost Doppler radar receivers Claim to Fame: BINET uses an array of receivers to pick up signals scattering obliquely from radar targets, thus maximizing the wind data gained from a single Doppler transmitter. It was created by Wurman during his postdoctoral stay at ATD in 1993-94. Although a Doppler radar costs $2 million or more, BINET receivers cost only a small fraction of that. The PIRAQ signal processing technology (see below), originally developed for BINET, should further reduce the cost of receivers.
First Deployment: Testing took place in 1993-94 using the CP-2 transmitter at Marshall and BINET receivers atop the Foothills Lab and near Mead, Colorado. NCAR now has a cooperative agreement with Wurman for continued development. A permanent bistatic network is being deployed around Montreal, Quebec, Canada, in a collaboration between NCAR, Oklahoma, and McGill University.


PIRAQ

PC Integrated Radar Acquisition
"We took a big step in technology in a short time with very limited support and very great success."--Mitch Randall

Photo of PIRAQ
This PC card devised by Mitch Randall could help revolutionize weather radar processing. (Photo by Carlye Calvin.)

Who's Involved: Mitch Randall and Eric Loew, developers
What It Is: A card that turns a personal computer into a complete radar receiver/data acquisition system
Claim to Fame: The inexpensive PIRAQ card opens the door for vastly greater flexibility in radar deployment by compressing the space needed for signal processing from bookshelf-sized units to a single PC card. The programmability allows each user to tailor the configuration as needed. Since it is small and inexpensive, it is ideal for many new research applications.


First Deployment: Testing is now under way, and a PIRAQ-based, mobile Doppler radar system will be used in the Verification of the Origins of Rotation in Tornadoes experiment in Oklahoma this spring.


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Edited by Bob Henson, bhenson@ucar.edu
Last revised: Wed Mar 29 12:41:55 MST 2000