Advanced sine wave modulation of continuous wave laser system for atmospheric CO2 differential absorption measurements

Autor:	Campbell, Joel F., Lin, Bing, Nehrir, Amin R.
Rok vydání:	2013
Předmět:	Physics - Atmospheric and Oceanic Physics Astrophysics - Instrumentation and Methods for Astrophysics
Zdroj:	Applied Optics, Vol. 53, Issue 5, pp. 816-829 (2014)
Druh dokumentu:	Working Paper
DOI:	10.1364/AO.53.000816
Popis:	In this theoretical study, modulation techniques are developed to support the Active Sensing of CO2 Emissions over Nights, Days, and Seasons (ASCENDS) mission. A CW lidar system using sine waves modulated by ML pseudo random noise codes is described for making simultaneous online/offline differential absorption measurements. Amplitude and Phase Shift Keying (PSK) modulated IM carriers, in addition to a hybrid pulse technique are investigated that exhibit optimal autocorrelation properties. A method is presented to bandwidth limit the ML sequence based on a filter implemented in terms of Jacobi theta functions that does not significantly degrade the resolution or introduce side lobes as a means of reducing aliasing and IM carrier bandwidth. Comment: Accepted for publication in Applied Optics
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1309.3542 Zobrazit plný text záznamu View this record from Arxiv