Paper
27 December 1996 Simulation of analog and digital heterodyning in Doppler lidars at different pulse profiles
Elena V. Stoykova
Author Affiliations +
Proceedings Volume 3052, Ninth International School on Quantum Electronics: Lasers--Physics and Applications; (1996) https://doi.org/10.1117/12.262948
Event: Ninth International School on Quantum Electronics: Lasers: Physics and Applications, 1996, Varna, Bulgaria
Abstract
The work presents results of simulation of processing of wideband doppler lidar signals by analog and digital heterodyning at different profiles of the transmitted laser pulse. At assumption of signal statistics determined by the transmitted pulse, the return signals are simulated immediately after the optical mixing in the time-domain using three pulse shapes: rectangular, Gaussian and a CO2 laser pulse with a tail at different wideband signal-to- noise ratios. Simulation of analog heterodyning includes quadrature detection with reference frequency instability. Simulation of the digital heterodyning includes the direct sampling of the return signal after the photomixer as well as the undersampling of this signal without and with preliminary filtering. The cases of narrow and wide return doppler spectra compared with the Nyquist interval are simulated. The number of generated realizations varies with the signal-to-noise ratio. To compare the vulnerability of the considered processing schemes with the pulse shape a maximum likelihood doppler shift estimate is used. As an output of the simulation the probability density function of the doppler estimate for the ensemble of generated realizations is found.
© (1996) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Elena V. Stoykova "Simulation of analog and digital heterodyning in Doppler lidars at different pulse profiles", Proc. SPIE 3052, Ninth International School on Quantum Electronics: Lasers--Physics and Applications, (27 December 1996); https://doi.org/10.1117/12.262948
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KEYWORDS
Doppler effect

Heterodyning

Analog electronics

LIDAR

Signal processing

Optical simulations

Signal to noise ratio

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