Comparison of CO2 Doppler lidar and GPS rawinsonde wind velocity measurements

John R. Roadcap; Patrick J. McNicholl; Edward H. Teets Jr.; Mitchell H. Laird

doi:10.1117/12.438174

4 September 2001 Comparison of CO₂ Doppler lidar and GPS rawinsonde wind velocity measurements

John R. Roadcap, Patrick J. McNicholl, Edward H. Teets Jr., Mitchell H. Laird

Proceedings Volume 4376, Laser Weapons Technology II; (2001) https://doi.org/10.1117/12.438174
Event: Aerospace/Defense Sensing, Simulation, and Controls, 2001, Orlando, FL, United States

Abstract

A comparison of CO2 Doppler lidar and GPS rawinsonde measurements of horizontal wind velocity was conducted during May 2000 at Hanscom AFB, Massachusetts. Seven days of side-by-side measurements using both lidar and GPS sondes were achieved comparing wind velocity as a function of altitude up to 6 km. The horizontal wind velocity was determined by the CO2 Doppler lidar using the Velocity Azimuth Display (VAD) method. Horizontal winds were also determined simultaneously using a differential GPS-tracked rawinsonde which provides GPS position coordinates once per second. Both lidar VAD wind speed Root Mean Squared Difference (RMS) and lidar vs. GPS sonde RMS were calculated and compared as a function of altitude, time, and stability regime. On average, significant increases in both the lidar VAD RMS and lidar vs. GPS RMS were observed during unstable conditions compared to stable conditions. Analyses of lidar VAD RMS show the smallest typical values average near 0.5 m/s over a single profile.

Citation Download Citation

John R. Roadcap, Patrick J. McNicholl, Edward H. Teets Jr., and Mitchell H. Laird "Comparison of CO₂ Doppler lidar and GPS rawinsonde wind velocity measurements", Proc. SPIE 4376, Laser Weapons Technology II, (4 September 2001); https://doi.org/10.1117/12.438174

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