Abstract
The characteristics and capability of a homemade all-fiber 1.54-μm pulsed coherent Doppler lidar (CDL) were validated in field experiments by comparing the detection results with a collocated lidar and sounding balloons. With the range gate of 30 m and temporal resolution of 16 s at velocity–azimuth display mode, the detection capability of the CDL ranged from 0.1 to 5 km, and the time sequence and height position of this CDL were calibrated by the collocated lidar. In the intercomparison experiments with sounding balloons, the discrepancy of 30-s averaged measurement results of horizontal wind speed and wind direction was nearly 0.7 m / s and 5.3 deg, respectively. The good agreement achieved in such a short averaged time period was a convincing case of intercomparison experiments between CDL and sounding balloon. The CDL system demonstrated good reliability and operational stability in field experiments.
Highlights
Coherent Doppler lidar (CDL) has been developed as a powerful tool for atmospheric wind velocity measurement,[1,2,3,4] aircraft wake-vortex hazard detection,[5,6,7] and wind turbulence measurement[8,9] with high temporal space resolution and high measurement accuracy due to its high carrier-to-noise detecting characteristics
Adopting a single longitudinal mode laser and a balanced detector is helpful for a CDL to realize high signal-to-noise ratio (SNR)
Considering the distance detection range of 0.1 to 5 km for our CDL, it is believed that the wind velocity in range of 100 to 260 m is suitable for calibration
Summary
Coherent Doppler lidar (CDL) has been developed as a powerful tool for atmospheric wind velocity measurement,[1,2,3,4] aircraft wake-vortex hazard detection,[5,6,7] and wind turbulence measurement[8,9] with high temporal space resolution and high measurement accuracy due to its high carrier-to-noise detecting characteristics. The first high pulse energy CDL (∼100 mJ at 2-μm wavelength) was developed by NASA Langley Research Center; it was used as a calibration and validation lidar (so-called “Validar”),[18] and the intercomparison results with ground-based wind-observing lidar facility were so encouraging.[19] Mitsubishi Electric Corporation developed an airborne 1.5-μm pulsed CDL, which was capable of detecting as far as 9.3 km with modifiable range resolutions, and the wind velocity measurement accuracy of the prototype was inspected in comparison with L-band wind profiler.[20,21,22] In 2011, Leosphere displayed a long-range lidar (Windcube 200S), which could measure three-dimensional (3-D)
Sign-in/Register to view highlights & summary 
Published Version (
Free)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call