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Validation of Radial Velocity Measurements from the NCAR Doppler Lidar

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Abstract

The NCAR Doppler lidar, a compact heterodyne CO2 system designed for airborne deployment, underwent extensive ground-based testing in 1994. The lidar uses an injection-seeded TEA laser to transmit 100-200 mJ pulses at 10.6 μm wavelength, usually at a pulse repetition frequency of 10 or 20 s-1. The optically heterodyned signal (5 to 15 MHz) is mixed with a reference oscillator at approximately 10 MHz to produce in-phase and quadrature components of 0 to 5 MHz each in order to use two 107 samples s-1 digitizers. Velocity is calculated using single-lag complex autocovariance processing of the Doppler-shifted backscatter signal from 500 m to 10 km in range every 15 m, with approximately 100 m range resolution for scattering structure. Spatially independent velocity samples are separated by approximately 200 m due to the laser pulse length. Radial velocity precision is ±0.4 m s-1 from 20 laser pulses and the velocity measurement range is ±26 m s-1.

© 1995 Optical Society of America

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