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The technique of High Spectral Resolution Lidar (HSRL) for atmosphericmonitoring allows the determination of the aerosol to molecular ratio and canbe used in UHECR Observatories using air fluorescence telescopes. By thistechnique a more accurate estimate of the Cherenkov radiation superimposed tothe fluorescence signal can be achieved. A laboratory setup was developed todetermine the backscattering coefficients using microparticles diluted in waterand diffusion interfaces. In this setup we used a CW SLM laser at 532 nm and a250 mm Newtonian telescope. Simulations of the above experimental configurationhave been made using Scatlab\c{opyright}, FINESSE\c{opyright} 0.99.8 andMATLAB\c{opyright} and are presented in this work. We compare the simulated2-dimensional Fabry-Perot fringe images of the backscattering signal recordedin the CCD sensor with that of experimental ones. Additionally, we simulatedthe backscattering of the laser beam by the atmosphere at a height of 2000 mand we have studied the influence of the beam and its diameter on the fringeimage.

Simulation Studies of the Backscattering Signal in HSRL Technique