caa a22 4500 606244239 CHVBK 20210128101329.0 cr unu---uuuuu 210128e20150601xx s 000 0 eng 10.1007/s12596-015-0247-8 doi (NATIONALLICENCE)springer-10.1007/s12596-015-0247-8 Lidar signal denoising methods- application to NARL Rayleigh lidar [Elektronische Daten] [M. Sarvani, K. Raghunath, S. Rao] Lidar (Light Detection And Ranging) is a remote sensing tool of great practical importance in environmental monitoring sciences. As an active remote sensing instrument, lidar provides vertical profiles of aerosol layers and atmospheric temperatures. The effective range and data reliability of lidar is often limited by various noises. Signal processing for lidar applications involves highly nonlinear models and consequently nonlinear filtering as the backscattered signal follows log-linear form. Denoising of the signal is essential for reducing random unwanted variations of the signal, in order to get the significance of the signal as much as possible. In this work, various denoising methods are applied to the signal from Rayleigh receiver of lidar at National Atmospheric Research Laboratory (NARL), Gadanki (13.8°N, 79.2°E) near Tirupati, India. Denoising methods such as Moving Average method, Wavelet and Empirical Mode Decomposition (EMD) method are considered and compared in this work. The Signal to Noise Ratio (SNR), temperature profiles and statistical standard temperature errors are obtained using denoised signals. It is found that EMD gives better SNRs than other denoising methods. The statistical standard temperature error obtained using EMD denoised signal and the original signal are compared and the EMD method is found to reduce temperature errors at higher ranges better than conventional method. The Optical Society of India, 2015 Lidar nationallicence Denoising methods nationallicence Signal to noise ratio nationallicence Atmospheric temperature retrieval nationallicence Temperature error nationallicence Sarvani M. Department of Physics, SV University, 517 502, Tirupati, India aut Raghunath K. National Atmospheric Research Laboratory, 517 112, Gadanki, India aut Rao S. Department of Physics, SV University, 517 502, Tirupati, India aut Journal of Optics Springer India 44/2(2015-06-01), 164-171 0972-8821 44:2<164 2015 44 12596 https://doi.org/10.1007/s12596-015-0247-8 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s12596-015-0247-8 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Sarvani M. Department of Physics, SV University, 517 502, Tirupati, India aut NATIONALLICENCE 700 1- Raghunath K. National Atmospheric Research Laboratory, 517 112, Gadanki, India aut NATIONALLICENCE 700 1- Rao S. Department of Physics, SV University, 517 502, Tirupati, India aut NATIONALLICENCE 773 0- Journal of Optics Springer India 44/2(2015-06-01), 164-171 0972-8821 44:2<164 2015 44 12596