NDLI: Extension of GPM dual-frequency iterative retrieval method with DSD-profile constraint

Content Provider	IEEE Xplore Digital Library
Author	Rose, C.R. Chandrasekar, V.
Copyright Year	1980
Abstract	A new Dual-Frequency Precipitation Radar (DPR) will be included on the Global Precipitation Measurement (GPM) core satellite which will succeed the highly successful Tropical Rainfall Measuring Mission satellite launched in 1997. New dual-frequency drop-size distribution (DSD) and rain-rate estimation algorithms are being developed to take advantage of the enhanced capabilities of the DPR. It has been shown previously that a backward-iteration algorithm can be embedded within a single-loop feedback model to retrieve the rain rate. However, the single-loop model is unable to correctly estimate DSD profiles for a significant portion of global median-volume-diameter, D/sub o/, and normalized DSD intercept parameter, N/sub w/, combinations in rain because of a multiple-value solution space. For the remaining D/sub o/,N/sub w/ pairs, another retrieval method is necessary. This paper proposes a dual-loop model, in which the intercept parameter, N/sub w/, of the DSD is constrained in its vertical profile, to guide the algorithm to correct convergence. This allows an additional constraint on the DSD values estimated by the iterative algorithm and helps to retrieve correct DSD values in the regions where the iterative approach alone fails. To demonstrate feasibility of the proposed method, three test cases representative of many DSD and profile combinations are discussed. The first case is a constant vertical profile of the DSD parameters. The second case examines linear variation of the DSD parameters, and the third case examines how measurement error affects the retrieval process. In each case, the proposed constraint on the intercept parameter is implemented, and the results are discussed. Using the constraint, the dual-loop algorithm is able to retrieve reasonable values for the DSDs and rain-rate profiles and extend the convergence region of the algorithm.
Sponsorship	IEEE Geoscience and Remote Sensing Society IEEE URSI
Starting Page	328
Ending Page	335
Page Count	8
File Size	551621
File Format	PDF
ISSN	01962892
Volume Number	44
Issue Number	2
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2006-02-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Iterative methods Iterative algorithms Satellites Rain Convergence Radar measurements Spaceborne radar Feedback Testing Measurement errors retrieval algorithms Drop-size distribution (DSD) estimation global precipitation measurement (GPM)
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences Electrical and Electronic Engineering

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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