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Proceedings Paper

Sensitivity Analysis For Airborne And Spaceborne Dial Measurements Of H2O Profiles
Author(s): Syed Ismail; Edward V. Browell
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Paper Abstract

Differential Absorption Lidar (DIAL) is an active remote sensing technique that can be used for the measurement of atmospheric constituents like water vapor (H2O) from airborne and spaceborne platforms. An analysis of the random and systematic error sources associ-ated with the measurement of H2O are presented. The DIAL measurement analysis is given for the H2O absorption bands around 720 nm but the approach also applies to other absorp-tion bands of H2O and to other molecules. The random errors due to the uncertainties in the measurement of the lidar signal and noise associated with the background and detector dark current are discussed. Systematic errors related to the atmosphere including Doppler broadening due to backscattering from air molecules, pressure shift of H2O lines, laser line distortion and systematic errors associated with the DIAL system including spectral impurity, laser tuning error, and stability are also discussed. The results of the anal-ysis are used to evaluate the performance of the airborne Lidar Atmospheric Sensing Exper-iment (LASE) H2O DIAL system presently under development. This analysis shows that a 10 percent H2O profile measurement accuracy is possible with spatial resolutions of 200 m vertical by 10 km horizontal during night and 250 m vertical by 20 km horizontal during day. Global measurements of H2O profiles from spaceborne DIAL systems can be achieved with similar accuracy with spatial resolutions of 500 m vertical by 100 km horizontal.

Paper Details

Date Published: 24 September 1987
PDF: 10 pages
Proc. SPIE 0783, Laser Radar II, (24 September 1987); doi: 10.1117/12.940587
Show Author Affiliations
Syed Ismail, ST Systems Corporation (STX) (United States)
Edward V. Browell, NASA LaRC (United States)

Published in SPIE Proceedings Vol. 0783:
Laser Radar II
Richard J. Becherer; Robert C. Harney, Editor(s)

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