Commenced in January 2007
Frequency: Monthly
Edition: International
Paper Count: 2

DOAS Related Publications

2 Optical Parametric Oscillators Lidar Sounding of Trace Atmospheric Gases in the 3-4 ┬Ám Spectral Range

Authors: Olga V. Kharchenko

Abstract:

Applicability of a KTA crystal-based laser system with optical parametric oscillators (OPO) generation to lidar sounding of the atmosphere in the spectral range 3–4 µm is studied in this work. A technique based on differential absorption lidar (DIAL) method and differential optical absorption spectroscopy (DOAS) is developed for lidar sounding of trace atmospheric gases (TAG). The DIAL-DOAS technique is tested to estimate its efficiency for lidar sounding of atmospheric trace gases.

Keywords: Atmosphere, DOAS, DIAL, lidar sounding, trace gases, nonlinear crystal

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1 Antenna Array Beamforming Using Neural Network

Authors: Abdel-Badeeh M. Salem, Maja Sarevska

Abstract:

This paper considers the problem of Null-Steering beamforming using Neural Network (NN) approach for antenna array system. Two cases are presented. First, unlike the other authors, the estimated Direction Of Arrivals (DOAs) are used for antenna array weights NN-based determination and the imprecise DOAs estimations are taken into account. Second, the blind null-steering beamforming is presented. In this case the antenna array outputs are presented at the input of the NN without DOAs estimation. The results of computer simulations will show much better relative mean error performances of the first NN approach compared to the NNbased blind beamforming.

Keywords: Neural Network, Beamforming, DOAS

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