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Leach, B.W. (author), MacPherson, J.I. (author)Airborne wind measurement techniques currently being used onboard the NAE Twin Otter Atmospheric Research Aircraft are described and their fundamentallimitations are discussed. In particular, a recently acquired L TN-90-1 00 strapdown inertial reference system (IRS) demonstrates significant low frequency Schuier oscillations in its velocity...report 1989