An Update on Multi-channel Receiver Development for the Realization Multi-mission Capabilities at the National Weather Radar Testbed

نویسندگان

  • M. Yeary
  • J. Crain
  • A. Zahrai
  • T.-Y. Yu
  • R. Palmer
  • G. Zhang
  • Y. Zhang
  • P. Chilson
  • M. Xue
  • Q. Xu
چکیده

This paper describes the status of a new project that will digitize radar signals coming from eight channels on the phased array antenna at the National Weather Radar Testbed (NWRT) in Norman, Oklahoma. At the current time, a single-channel digital receiver is operational to mimic the current WSR-88D capability. The multi-channel digital data will foster a new generation of adaptive/fast scanning techniques and spaceantenna/interferometry measurements, which will then be used for improved weather forecasting via data assimilation. Differing from the conventional rotating radar, the phased array is suited for multi-mission capabilities so that a variety of targets may be observed simultaneously with a high degree of fidelity. The development of a multi-channel receiver will be the catalyst and an enabling tool for research in this area for the next decade. This collaborative project, which involves scientists and engineers from the University of Oklahoma and the National Severe Storms Laboratory in Norman, is the result of a recently funded a grant from the National Science Foundation (as described in the Acknowledgement section of this paper). Instrumentation of the phased array radar system with a multi-channel receiver suite will bring the full creativity of researchers using advanced techniques for maximizing the information from radar observations, and optimally using them in numerical models to improve weather prediction. The multi-channel receiver will collect signals from the sum, azimuth-difference, elevationdifference, and five broad-beamed auxiliary channels. One of the major advantages of the NWRT is the capability to adaptively scan weather phenomena at higher temporal resolution than is possible by the WSR-88D. Hemispherical coverage in 1 min or less vs. 4 min, ∗ Corresponding author address: Dr. Mark Yeary, Atmospheric Radar Research Center, Norman, OK, e-mail: [email protected] can be accomplished without comprising data accuracy. The multi-channel receiver will allow direct implementation of inteferometry techniques to measure cross-beam wind, shear and turbulence within a radar resolution volume. Access to the auxiliary channels will enable clutter mitigation and advanced array processing for high data quality with short dwell times. Potential benefits of high quality and high resolution data together with cross-beam wind, shear and turbulence include better understanding of storm dynamics and convective initiation, better detection of small-scale phenomena including tornado and microburst, ultimately leading to increased lead time for warnings, and improved weather prediction.

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تاریخ انتشار 2009