[A-CG41] Promotion of Application and Utilization of Aircrafts for Earth sciences

[ACG41-06] Wind Mesurements Based on In-situ Data -Direct Vector Calculation and Hodograph Analyses-

*Masahiko Hayashi¹, Tomoyuki Onohara¹, Ryohei Haraguchi^1,3, Kei-ichi Ozuka^2,4, Kazuo Okabe³ (1.Faculty of Science, Fukuoka University, 2.Nippon Tungsten Co.,Ltd, 3.SkyRemote Co.,Ltd, 4.FIT-EH, Fukuoka University)

Keywords:wind mesurements, UAV, meteorology

Un-manned Aerial Vehicles have been developing rapidly and performance as observation platform are increasing. Our group have used Rogallo wing UAV, called KitePlane for aerosol measurement about 20 years ago. In-situ wind measurements have tested, becuase of importance for meteorological analyses and technical requirements for safety flight operations. There are two typical methods for atmospheric wind measurements based on in-situ data by in-flight airplane. One is direct calculation method by difference between gound speed and true air speed. The other is that drift of center of hodograph circle for ground speed coinsident with wind vector during flight.
Time and spatial resolutions for the direct calculations are around 1 second and 10 m respectively, and require high accuracy for true wind vectors. On the other hand, those for the hodograph methods are around 1 minuite and several hundreds meters, respectively, however the method only require position and time for calculations.
It will be presented based on actual flight by KitePlane that accuracies of wind speeds and directions are around 0.1m/sec and several degrees for both methods with recently developed small and precision sensors.