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Evaluation of the TAMDAR Turbulence Algorithm

Evaluation of the TAMDAR Turbulence Algorithm. Larry Cornman Research Applications Laboratory National Center for Atmospheric Research. Turbulence Calculations. The TAMDAR turbulence algorithm is based on: True airspeed (TAS) values. Sampled at 10.67Hz. Anti-aliasing filter applied.

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Evaluation of the TAMDAR Turbulence Algorithm

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  1. Evaluation of the TAMDARTurbulence Algorithm Larry Cornman Research Applications Laboratory National Center for Atmospheric Research

  2. Turbulence Calculations • The TAMDAR turbulence algorithm is based on: • True airspeed (TAS) values. • Sampled at 10.67Hz. • Anti-aliasing filter applied. • 32-point window = 3 second interval. • Maximum likelihood algorithm.

  3. Evaluation Methodology • Use NCAR algorithm (max. likelihood technique) applied to the TAMDAR TAS data: • Use 32-point window. • Account for anti-aliasing filter. • Look into other window lengths.

  4. Evaluation Methodology, cont’d. • Use NCAR algorithm applied to: • UND high-rate TAS (nose and wing ports). • UND high-rate longitudinal wind. • UND high-rate vertical wind. • Simulated data.

  5. Data Analysis – First Test Flight True Airspeed from UND and TAMDAR

  6. Data Analysis – First Test Flight One-Lag Plot: True Airspeed from TAMDAR

  7. Data Analysis – First Test Flight Average Spectra: True Airspeed from TAMDAR (109 256-pt windows, ½ overlap)

  8. Data Analysis – First Test Flight Raw 32-pt Spectra: True Airspeed from TAMDAR

  9. Data Analysis – First Test Flight EDR’s from UND and TAMDAR

  10. Data Analysis – First Test Flight Histogram of EDR’s from UND and TAMDAR

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