An Improved Airborne Wind Measurement Technique for the NAE (National Aeronautical Establishment) Twin Otter (Nouvelle Methode De Mesure Du Vent En Vol a Bord Du Twin Otter De L'ena)
Abstract
Airborne wind measurement techniques currently being used onboard the NAE Twin Otter Atmospheric Research Aircraft are described and their fundamental limitations are discussed. In particular, a recently acquired LTN-90-100 strapdown inertial reference system (IRS) demonstrates significant low frequency Schuler oscillations in its velocity components (attaining peak errors of 2 to 3 mps), actually degrading wind computation accuracy compared with older techniques. A new wind measurement technique, based on Kalman filter integration navigation approach, is described which solves this problem and provides wind computation accuracy superior to previous methods. Preliminary results, based on applying the Kalman filter to Twin Otter flight test data, indicate that inertial velocity accuracies of 0.3 mps RMS (per channel) are attainable, with a corresponding improvement in the accuracy of earth-referenced wind components. Keywords: Canada; French language.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 1989
- Accession Number
- ADA217978
Entities
People
- B. W. Leach
- J. I. Macpherson
Organizations
- National Research Council Canada