Difficulties in measuring the airspeed of helicopters because of low dynamic pressures in the low airspeed regime and because of the rotor downwash influencing the flow field around the fuselage are reviewed, and a nonlinear state observer for the estimation of helicopter airspeed is described. Uncertainties in the models of helicopter dynamics affect the method. A procedure that allows a simple adaptation of the models to real conditions is presented. It is shown that parameter sensitivity can be reduced and the low static stability regime can be handled. The results are verified by flight tests.
Observer Approach to the Estimation of Helicopter Airspeed
1987
152 pages
Report
No indication
English
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