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Measurements of Waves in a Wind-wave Tank Under Steady and Time-varying Wind Forcing
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Published on: February 13, 2018

Coherent lidar airborne windshear sensor: performance evaluation.

R Targ, M J Kavaya, R M Huffaker

    Applied Optics
    |August 12, 2010
    PubMed
    Summary
    This summary is machine-generated.

    Detecting windshear is critical for aviation safety. This study shows coherent laser radar (lidar) systems can provide pilots with advance warning of windshear hazards, improving flight safety.

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    Area of Science:

    • Aviation safety
    • Atmospheric remote sensing
    • Laser technology

    Background:

    • Windshear poses a significant threat to aircraft safety, highlighted by the 1985 Dallas/Fort Worth International Airport crash.
    • The NASA/FAA National Integrated Windshear Program aims to develop effective windshear detection systems.
    • Existing detection methods require improvement for timely pilot warnings.

    Purpose of the Study:

    • To define a measurable windshear hazard index detectable from an aircraft.
    • To evaluate the performance of coherent laser radar (lidar) systems for windshear detection.
    • To provide pilots with crucial information about future wind conditions along their flight path.

    Main Methods:

    • Conducted a technology analysis and end-to-end performance simulation of competing lidar systems.
    • Measured signal-to-noise ratios and wind velocity errors for different lidar technologies.
    • Focused on Ho:YAG lidar at 2.1 micrometers and CO(2) lidar at 10.6 micrometers.

    Main Results:

    • Both Ho:YAG and CO(2) lidar systems can detect the line-of-sight component of windshear threats.
    • Detection range extends 2-4 km ahead of the aircraft, providing 20-40 seconds of warning time.
    • Effective detection is achievable even in moderately heavy precipitation.

    Conclusions:

    • Coherent lidar technology offers a viable solution for airborne windshear detection.
    • The developed windshear hazard index can be remotely sensed, enhancing pilot situational awareness.
    • A Coherent Lidar Airborne Shear Sensor (CLASS) is under development for flight evaluation, promising improved aviation safety.