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airdata at high airdata boom airdata measurement techniques airdata sensing airdata system airspeed vector altitude ambient ambient pressure angle of attack angle of sideslip backscattered signal black body radiation calibrated cirrus clouds clear air correlation DOPPLER AIRSPEED SENSOR Doppler airspeed system Doppler shifted Doppler velocimeter environment FADS fighter aircraft Figure flash lamp flight envelope Flight Research flight test flight vehicle flow effects flow field fluorescence and Rayleigh flush airdata freestream airdata frequency high angle hypersonic immersion sensors in-flight laser m/sec Mach number measure the airspeed measurement concept measurement problem measuring airdata measuring freestream static ment NASA NCAR nonintrusively number density operation Optical Airdata Techniques optical depth Optical technology advances oxygen molecule parameters perature PERFORMANCE AND CONCLUSlONS pressure orifice pressure-based radiation Rayleigh scattering RESULTS OF OPTICAL SCATTER SENSOR SENSOR FLlGHT TESTS sheet-pairs airspeed Sheet-pairs system static temperature surement system performance technology advances show tempera temperature sensor time-of-flight ture ultraviolet vane wavelength