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This study deals with the problem of turbulence measurement with  small remotely piloted aircraft (RPA). It shows how multi-hole  probes (MHPs) can be used to measure fluctuating parts of the  airflow in flight up to 20 Hz. Accurate measurement of the  transient wind in the outdoor environment is needed for the  estimation of the 3-D wind vector as well as turbulent fluxes of heat,  momentum, water vapour, etc. In comparison to an established MHP  system, experiments were done to show how developments of the system  setup can improve data quality. The study includes a re-evaluation  of the pneumatic tubing setup, the conversion from pressures to  airspeed, the pressure transducers, and the data acquisition  system. In each of these fields, the steps that were taken lead to  significant improvements. A spectral analysis of airspeed data  obtained in flight tests shows the capability of the system to  measure atmospheric turbulence up to the desired frequency range

Towards higher accuracy and better frequency response with standard multi-hole probes in turbulence measurement with remotely piloted aircraft (RPA)