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Range Imaging
Research Prototype
Currently available on an experimental basis with limited number of wind profilers (e.g., some NOAA/ERSL profilers, NCAR's MAPR profiler, and some university systems). Note that this is a signal processing method and must be operated on a wind profiler with the capability of rapidly switching frequency. The frequency shift is typically small (less than or equal to 2 MHz).
There is no request procedure per se. The range imaging technique requires that a wind profiler be modified. Then the signal processing be implemented
Emerging Technologies
Wind profiling radars operate within stringent frequency management constraints, which limit their range resolution. A typical range resolution for wind profiler measurements is about 100 m, which is too coarse to adequately reproduce the spatial structure embedded within the atmosphere. Range imaging (RIM) has been developed as a means of improving range resolution (Palmer et al. 1999) and has furthermore been shown to be effective for measurements within the boundary layer at UHF (Chilson et al. 2003). RIM can be thought of as a frequency hopping technique, in which several closely spaced carrier frequencies are transmitted and received, and a constrained optimization method is used to generate high-resolution maps of the reflectivity field in range. The fundamentals of RIM are analogous to the principles of beam forming used in coherent radar imaging (CRI). Whereas CRI uses radar signals from multiple receive antennas to image in angle, in RIM different radar frequencies are used to image in range.
Phillip B. Chilson, Assoc. Professor
University of Oklahoma
School of Meteorology & Atmospheric Radar Research Center University of Oklahoma 120 David L. Boren Blvd., Rm 4618 Norman, OK 73072-7307
Phone: +1 405 325 5095 Fax: +1 405 325 7689
URL: http://arrc.ou.edu/~chilson
William O. J. Brown
PO Box 3000 Boulder, CO 80303
Development SectorAcademia
R&D ProgramNo
Years Till Available3-5
Investment RequiredN/A
Projected ApplicationImproved resolution of reflectivity and wind fields
Unit CostN/A
Key RisksNone
Ease of Useunattended
Chilson, P. B, T. Yu, R. G. Strauch, A. Muschinski, R. D. Palmer, 2003: Implementation and validation of range imaging on a UHF radar wind profiler, J. Atmos. Ocean. Tech., 987-996 Palmer, R. D, T. Y. Yu, and P. B. Chilson, 1999: Range imaging using frequency diversity, Radio Sci., 6, 1485-1496 Yu, T. Y. and W. O. J. Brown, 2004: High-resolution atmospheric profiling using combined spaced antenna and range imaging techniques, Radio Sci., RS1011,doi:10.1029/2003RS002907
RIM has been used for research applications within universities and government laboratories, but is currently being developed for a wider distribution by Vaisala, Inc.
30 Sep 2009 14:46