School of Meteorology Seminar Series presents...
SoM/ECE THESIS DEFENSE
Crossbeam Wind Measurements using the Sum and Difference Signals from the NWRT
Yinguang Li
School of Meteorology
School of Electrical and Computer Engineering
The University of Oklahoma, Norman, OK
29 October 2009, 8:00 AM
National Weather Center, Room 4140
120 David L. Boren Blvd.
University of Oklahoma
Norman, OK
Directions to the NWC (.pdf, 60 kb)
In this thesis, the solutions and statistical errors for the parameters of the Gaussian functions, used to describe the correlation functions of signals from spaced antennas (SA), are summarized and applied to the National Weather Radar Testbed (NWRT). In addition, the solutions and statistical errors of baseline winds estimated using published techniques such as the G-FCA, G-CCR, D-FCA, and D-CCR are summarized, and their performances as a function of radial turbulence intensity, apparent baseline wind, and apparent cross-baseline wind are plotted in figures. The relation between virtual spaced receiving antennas and the sum and difference channels on the NWRT monopulse radar is derived. The analytical expressions of auto- and cross-correlation functions of sum and difference signals are derived and a new approach (i.e., called the INT) to estimate the apparent baseline wind, based on the correlation functions of these signals, is developed. A Monte Carlo simulator based on the configuration of the NWRT is introduced to test the theory and show the performances of crossbeam wind measuring methods based on SA techniques as well as monopulse radar configurations. Finally, the performances of G-FCA, G-CCR, and INT crossbeam wind estimation techniques are compared using the simulator.