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National Severe Storms Laboratory

O KLAHOM A. school of electrical and computer engineering. The university of. National Severe Storms Laboratory.

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National Severe Storms Laboratory

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  1. OKLAHOMA school of electrical and computer engineering The university of National Severe Storms Laboratory Cooperative Institute for Mesoscale Meteorological Studies Techniques for Detection and Tracking Airplanes Using WSR-88D Svetlana Bachmann, Dusan Zrnic, National Severe Storm Laboratory, NOAA, Norman, OK Victor DeBrunner, Mark Yeary, School of Electrical and Computer Engineering, The University of Oklahoma, Norman, OK svetlana.bachmann@noaa.gov, vdebrunn@ou.edu, myeary@ou.edu, dusan.zrnic@noaa.gov airplane-1 spectra abstract airplane-2 spectra tracking Trajectory weighted with the Hanning window Z, dB V, m s-1 weighted with the Hanning window For the first time, weather radar echoes from point scatterers (airplanes) in a non-stormy environment are investigated in the time and frequency domains and compared to model simulations to build a background for differentiating these echoes from weather signals and to develop procedures for data censoring. 5 km 10 km Power (dB) Power (dB) 15 km 170 180 toward, 40 m s–1 Airplane-1 cut 13: away, 24 m s–1 airplane in front of behind clear-air 1° at 15 km – 262 m, at 9 km – 157 m Airplane-2 cut 13: toward, 13 m s–1 Velocity (m s–1) Velocity (m s–1) cross section motivation model The NWS network of WSR-88D covers the entire US • WSR-88D operate continuously Awareness about security • can weather radar detect and track non-cooperative targets, e.g. airplanes ? distributed scatterers point scatterers 1000..5000 rpm vd = 40..55 m s-1 A, B, C • Speed of flight • Moving parts: propeller (rpm), etc. • Turbulence • Position in the resolution volume 6 radar set up |K|2 = 0.93 t = 1.57 ms q1 = 0.95p/180 rad l = 0.1 m • Aircraft can be tracked • with weather radar • Aircraft has signature • in Doppler spectrum • Doppler spectra corresponds to the • physical characteristics of the craft: • replicated spectral characteristics of • Cessna 188 Ag Wagon. • Categories of Airplanes • could be distinguished simulation KOUN WSR-88D • RF = 2705 MHz • Pt = 750 kW • Parabolic, d = 8.5 m • Beam-width 0.95° • Short/long pulse • H, H/V polarization • 381.3 m ASL weighted with the Hanning window altitude 9 Power (dB) 363 m Time series data collected by KOUN for Homeland Defense Radar Test on March 26 2003 Velocity (m s-1) 2400 rpm, v = 41 m s –1 A = 2, B = .5, C = 248

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