NDLI: Inexpensive FM-CW Radar for Boundary-Layer Precipitation Studies

Content Provider	IEEE Xplore Digital Library
Author	Williams, C.R.
Copyright Year	2004
Abstract	A vertically pointing C-band (5.8-GHz) frequency-modulated (FM) continuous-wave Doppler radar was developed for less than U.S. $6000, which can estimate the Doppler velocity power spectra from 20 to 300 m above the ground with a 5-m resolution. Three key design elements kept the costs low. First, the data acquisition system (DAS) commanded a direct digital synthesizer to start the FM sweep and then collected all voltage samples. This architecture insured phase coherence between the transmit FM sweep and the sampled voltages, which is critical for the Doppler processing that detects target phase changes over several successive FM sweeps. Second, a 5-m range resolution was achieved by increasing the FM bandwidth to over 36 MHz and decreasing the DAS sample rate to 500 kHz, enabling the use of an inexpensive DAS. Third, the Doppler processing at each range was achieved using two fast Fourier transforms (FFTs), i.e., a range FFT converted FM sweep voltages into in-phase and quadrature voltages I and Q at each range, and a Doppler FFT converted I and Q voltages from consecutive sweeps into the Doppler velocity power spectra. Observations show precipitation variability at 1-s and 5-m resolutions in the lowest 300 m of the atmosphere.
Sponsorship	IEEE Geoscience and Remote Sensing Society
Starting Page	1031
Ending Page	1035
Page Count	5
File Size	844371
File Format	PDF
ISSN	1545598X
Volume Number	8
Issue Number	6
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-11-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Doppler radar Doppler effect Frequency modulation Radar antennas Spectral analysis radar velocity measurement frequency-modulation (FM) radar
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering Geotechnical Engineering and Engineering Geology

Sl.	Authority	Responsibilities	Communication Details
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
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
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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