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There has long been a need for a suitable airborne instrument for the remote measurement of wind speeds near the surface within hurricanes and typhoons. This study considers the applicability and implementability of several pseudo-Doppler radar methods of wind speed determination for hurricane reconnaissance missions. Useful measurements of the wind speed and wind direction profiles for any altitude region below the aircraft, appear to be feasible using two of the systems described. (Author).
Wind measurements taken during two storms in March 1967, using a dual-beam incoherent radar, are in good agreement with those obtained with a Doppler radar. During a third storm the dual-beam results fluctuated with apparent periods of the order of one to three minutes. A theory is developed to explain these fluctuations as the result of eddies of one third to one mile diameters and peripheral speeds of one quarter to one half. A limitation on range is derived for dual-beam wind measurement in cyclonic storms. Design criteria relating to PRF, wavelength, and antenna size for dual-beam wind-measuring radars are developed. (Author).
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