Sensitivity Analysis For Airborne And Spaceborne Dial Measurements Of H2O Profiles

Syed Ismail; Edward V. Browell

doi:10.1117/12.940587

24 September 1987 Sensitivity Analysis For Airborne And Spaceborne Dial Measurements Of H₂O Profiles

Syed Ismail, Edward V. Browell

Proceedings Volume 0783, Laser Radar II; (1987) https://doi.org/10.1117/12.940587
Event: 1987 Technical Symposium Southeast on Optics, Electro-Optics, and Sensors, 1987, Orlando, FL, United States

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.

Citation Download Citation

Syed Ismail and Edward V. Browell "Sensitivity Analysis For Airborne And Spaceborne Dial Measurements Of H₂O Profiles", Proc. SPIE 0783, Laser Radar II, (24 September 1987); https://doi.org/10.1117/12.940587

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