NDLI: Implementation of a new refractivity estimation algorithm on a network of S-band radars

Content Provider	IEEE Xplore Digital Library
Author	Fritz, J. Chandrasekar, V.
Copyright Year	2007
Description	Author affiliation: Colorado State Univ., Fort Collins (Fritz, J.; Chandrasekar, V.)
Abstract	The retrieval of the surface-layer moisture field can be obtained by estimating the refractive index of air, measured in parts per million and referred to as refractivity. A technique developed to estimate the refractivity using radar has been demonstrated with validated results from field experiments [1], [2]. This technique utilizes the measured change in phase from stationary ground targets, which will be primarily due to changes in refractivity at warmer temperatures given a stable radar frequency. While this technique has been successfully demonstrated on individual radars, there is no clearly defined method of combining multiple radar estimations beyond gridding and averaging. Recently, however, a new algorithm was proposed as an alternative approach, especially when dealing with multiple radars [3]. The new algorithm uses a minimum least squared error approach, with a smoothing constraint and a method to address phase wrapping. This paper will explore the implementation of this constrained least squares (CLS) approach with data collected during a refractivity field experiment during the summer of 2006 in Colorado. It will also explore the implications of running the CLS algorithm in real-time, and briefly discuss future directions.
Starting Page	2738
Ending Page	2741
File Size	603209
Page Count	4
File Format	PDF
ISBN	9781424412112
DOI	10.1109/IGARSS.2007.4423409
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-07-23
Publisher Place	Spain
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Refractive index Radar measurements Phase estimation State estimation Moisture measurement Phase measurement Land surface temperature Frequency Wrapping Collaborative software
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
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