Raman lidar measurements for boundary layer gradients and atmospheric refraction of millimeter-wave signals

Hans Hallen; C. Russell Philbrick

doi:10.1117/12.2557158

19 May 2020 Raman lidar measurements for boundary layer gradients and atmospheric refraction of millimeter-wave signals

Hans Hallen, C. Russell Philbrick

Proceedings Volume 11410, Laser Radar Technology and Applications XXV; 1141006 (2020) https://doi.org/10.1117/12.2557158
Event: SPIE Defense + Commercial Sensing, 2020, Online Only

Abstract

The atmospheric boundary layer is typically characterized by a higher water vapor content and higher temperature than the free troposphere above it. Its height increases as the size of convection cells grow during the morning due to surface heating, stabilizes during the day, and it collapses as the energy input decreases in the evening. The marine boundary layer emphasizes these aspects. The large temperature gradients, humidity gradients and shear at the top of the boundary layer impact several processes, such as changes in both propagation properties as a function of wavelength and aerosol size distributions. We use Raman lidar to measure the gradients, and investigate several data inversion techniques to determine the best approach to obtain a high accuracy, for high SNR profiles of these gradients. Methods include anisotropic averaging between height and range, and averaging only to the level required for a specific target SNR. Examples that benefit from different time and range averaging will be given. The methods for gradient calculations and the interaction with pre- or post-averaging are also investigated. We model the impact of gradient-profile measurement from errors in the refraction of radar beams as a measure of quality requirements.

Conference Presentation

Citation Download Citation

Hans Hallen and C. Russell Philbrick "Raman lidar measurements for boundary layer gradients and atmospheric refraction of millimeter-wave signals", Proc. SPIE 11410, Laser Radar Technology and Applications XXV, 1141006 (19 May 2020); https://doi.org/10.1117/12.2557158

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available