NDLI: Time-domain adaptive beamforming of HF backscatter radar signals

Content Provider	IEEE Xplore Digital Library
Author	Griffiths, L.
Copyright Year	1963
Abstract	Experimental results relating to the use of time-domain, continuously adapting beamformers in an HF bistatic FM/CW backscatter radar system are presented. Data for the study were obtained using the Wide Aperture HF Radio Research Facility (WARF) which is located in the central valley of California and is operated by Stanford Research Institute, Menlo Park, CA. Eastward-looking transmissions were employed with an operating frequency chosen so as to provide single-hop ionospheric propagation on both the forward and backscatter paths. Digital real-time recordings were taken at eight received subarray outputs. These recordings were then processed off-line using a large general purpose computer. The beamforming methods studied, however, are computationally simple and may be readily implemented in real-time using a commercially available minicomputer. Two adaptive algorithms were studied and in both cases it was shown that signal-to-noise ratio improvements of 10 to 15 dB are readily achieved when adaptive beamforming is compared with conventional, Dolph taper beamforming methods using identical received data in an HF backscatter environment. It was also demonstrated that the time scale of coefficient variation in an adaptive processor operating in this environment is the order of 1 s. Successful tracking of the adaptive algorithm under these conditions was demonstrated. The use of moving target indication (MTI) clutter suppression filters at the subarray outputs, prior to adaptation, was investigated. No significant improvement was observed with the use of these filters on experimental data. Finally, it was shown that the presence of fading nulls can significantly affect the determination of optimal subarray location and spacing in an HF environment. In general, the adaptive beamformer performance was found to be less dependent upon array geometry than was the case for conventional processing.
Sponsorship	IEEE Antennas and Propagation Society
Starting Page	707
Ending Page	720
Page Count	14
File Size	1303225
File Format	PDF
ISSN	0018926X
Volume Number	24
Issue Number	5
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1976-09-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Time domain analysis Array signal processing Hafnium Backscatter Radar Adaptive algorithm Filters Apertures Frequency Digital recording
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electrical and Electronic Engineering

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

An on-line adaptive beamforming capability for HF backscatter radar

A comparison of quadrature and single-channel receiver processing in adaptive beamforming

Application of adaptive beamforming techniques to HF radar

Mapping of North Atlantic winds by HF radar sea backscatter interpretation

Multi-Resolution Composite Array for Digital Beamforming With High Angular-Resolution

Beamforming and aberration correction in HF radar

Adaptive array beamforming for cyclostationary signals

Robust adaptive array beamforming for cyclostationary signals under cycle frequency error

UWB Beamforming Using 2-D Beam Digital Filters

Time-domain adaptive beamforming of HF backscatter radar signals

Similar Documents

An on-line adaptive beamforming capability for HF backscatter radar

A comparison of quadrature and single-channel receiver processing in adaptive beamforming

Application of adaptive beamforming techniques to HF radar

Mapping of North Atlantic winds by HF radar sea backscatter interpretation

Multi-Resolution Composite Array for Digital Beamforming With High Angular-Resolution

Beamforming and aberration correction in HF radar

Adaptive array beamforming for cyclostationary signals

Robust adaptive array beamforming for cyclostationary signals under cycle frequency error

UWB Beamforming Using 2-D Beam Digital Filters

Time-domain adaptive beamforming of HF backscatter radar signals