Simulation of analog and digital heterodyning in Doppler lidars at different pulse profiles

Elena V. Stoykova

doi:10.1117/12.262948

27 December 1996 Simulation of analog and digital heterodyning in Doppler lidars at different pulse profiles

Elena V. Stoykova

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.

Citation Download Citation

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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