Practical Aspects of Focal Plane Array Testing
|
|
- David York
- 6 years ago
- Views:
Transcription
1 Practical Aspects of Focal Plane Array Testing Lessons from an FPA Test-bed at CSIRO, Marsfield Douglas B. Hayman1-3, Trevor S. Bird2,3, Karu P. Esselle3 and Peter J. Hall CSIRO Astronomy and Space Science, CSIRO ICT Centre, Electronic Engineering, Macquarie University, Dept Electrical and Computer Engineering, Curtin University of Technology Contact douglas.hayman (at) csiro.au 4 A test-bed to study Focal Plane Array (FPA) systems has been built at the CSIRO Radiophysics laboratory at Marsfield in Sydney. Called the New Technology Demonstrator (NTD) Interferometer, it was developed by a team from CSIRO, many of whom are now involved in the design of the Australian Square Kilometre Array Pathfinder (ASKAP) [1]. The test-bed consists of two 14 m antennas, one fitted with a single horn and the other employing an 8 8 array of Vivaldi elements, which was designed by the Dutch astronomy organization ASTRON. The primary weighting used for beamforming was the maximum sensitivity or gain (G) on system temperature (T). This presentation will concentrate on some of the practical aspects of evaluating the testbed's operational performance, including: Dealing with a high level of radio frequency interference (RFI): Filters were fitted to the system to reduce intermodulation distortion products and the operational frequencies were restricted. Choice of reference source: A number of choices of reference (calibration) sources were explored including geostationary and LEO satellites as well as astronomical sources. G, T and G/T measurement: Methods for absolute and relative G/T determination were explored and uncertainty estimates were calculated. Radiation patterns: Methods to determine aperture illumination from short radiation pattern cuts were explored. Lessons from both the design and evaluation of the NTD Interferometer have contributed to the development of a second test-bed at Parkes and the design of ASKAP. [1] D. B. Hayman, R. Beresford, J. Bunton, C. Cantrall, T. Cornwell, A. Grancea, C. Granet, J. Joseph, M. Kesteven, J. O Sullivan, J. Pathikulangara, T. Sweetnam, and M. Voronkov, The NTD interferometer: A phased array feed test bed, Workshop on Applications of Radio Science, Hayman%20et%20al%20WARS% pdf International Workshop on Phased Array Antenna Systems for Radio Astronomy, Brigham Young University, Provo, Utah, USA May 3 5, 2010
2 Practical Aspects of Focal Plane Array Testing Lessons from an FPA Test-bed at CSIRO, Marsfield International Workshop on Phased Array Antenna Systems for Radio Astronomy, Brigham Young University, Provo, Utah, USA May 3 5, 2010 Douglas B. Hayman 1-3, Trevor S. Bird 2,3, Karu P. Esselle 3 and Peter J. Hall 4 1 CSIRO Astronomy and Space Science, 2 CSIRO ICT Centre, 3 Electronic Engineering, Macquarie University, 4 Dept Electrical and Computer Engineering, Curtin University of Technology Contact douglas.hayman (at) csiro.au
3 Overview Historical context Description of the testbed at the Radiophysics Lab, Sydney Some results Lessons/issues confronted 2/19
4 Historical Context Focal Plane Array (FPA) Work at CSIRO ~2002: Collaboration on FARADAY array with ASTRON: Near field antenna measurements Testing with a Luneburg lens 2003/4: FPA projects Two PhD students start: Receiver on a chip: Suzy Jackson Beamforming FPAs: Doug Hayman Plans for a testbed at Marsfield underway New Technology Demonstrator (NTD) Interferometer Plans for (what was to become) ASKAP Focus on digital beamforming Western Australia site planning 2006: FPA for NTD (THEA tile) arrives from ASTRON : NTD operational 2008 Parkes 12m testbed first light 3/19
5 NTD 1 Interferometer Overview Get FPA test bench going fast On site dedicated system Support decisions needed for the ASKAP Learn about FPAs 2 dishes at Marsfield Radiophysics Laboratory Recycled Fleurs dishes One with an FPA: ASTRON s 8x8 THEA tile One with a single feed f/d: ~0.4 Diameter: 14m. Large enough for astronomical signals. 24MHz beamformer-correlator 1 New Technology Demonstrator: Project name for CSIROs early PFA development Google Maps 4/19
6 NTD Interferometer Block Diagram Focal Plane Array Single horn feed 21 cables to pedestal GHz East Receiver West Receiver IF: 70 MHz (BW 24 MHz) Digitizer Beamformer-correlator Digitizer Beamformer (weighted sum) Correlator Integrator 1024 complex data points across 28 MHz per second 5/19
7 NTD Photo THEA Tile for FPA Downconverter Horn Feed 6/19 Beamformer/Correlator
8 Front End Filter Significant second and third order distortion: mobile phone base station at 947MHz and a TV station at 527MHz. A filter (1100 to 1700MHz) was added between the first and second stages of amplification resulting in: 5-10dB improvement in distortion products Freq 1200MHz 0.51λ element spacing. 7/19
9 Vertex calibrator Focal Plane Array Radiator 21 cables to pedestal GHz Receiver Noise Source Receiver Digitizer Beamformer-correlator Digitizer Beamformer (weighted sum) Correlator Integrator 1024 complex data points across 28 MHz per second 8/19
10 Vertex calibrator Amplified noise diode for signal Log periodic antenna Correlated a coupled signal from source with each element s signal to get a magnitude and phase measure Proved a useful diagnostic tool Beamform on the calibration signal Independent of antenna pointing System self test Current focus ASKAP Continuous ~1% T sys cal. signal Radiator choice? Signal to radiator: fibre or coax? Aaronia AG HyperLOG 9/19
11 Measurement Method Data for Weights Point source for element responses (~20min) Virgo A (M87) in interferometer mode Blank sky for noise covariance matrix (~ 1hr) Correlation between each element Avoid any strong sources in the sky Calculate maximum G/T weights Apply weights in the beamformer Interferometer response... Single dish response... e( θ, φ) C w 1 = C e 10/19
12 Measurement Method Interferometer Mode Relative G/T against single element (more precise than single antenna measurements): Signal level: Virgo A (M87) in interferometer mode Noise level: Blank sky: autocorrelation Pattern cuts against SGRA* and Virgo A Made with respect to beam centre (coordinate transforms wrt antenna pointing) Try to get as much information from short pattern cuts (~6 beamwidths) Interpolate to get 2D far field Project to aperture (Fourier transform with Hamming filter) Allows qualitative comparisons between different cases single element and weighted cases 11/19
13 Results for Offset Array + 1 Defect Single Array + 1 defect 12/19 Weighted over single element G/T improvement 2.0dB
14 Results for Central Array + 1 Defect Single Array + 1 defect Element Weight Amplitude (db) Element Position (λ) Element Weight Amplitude (db) Element Position (λ) /19 Weighted over single element G/T improvement 2.2dB
15 Measurement Method G/T Performance Single dish mode Y factor On/Off M87 Y factor On/Off absorber T rx estimate 137 ( ) K Weighting Number of Elements G/T (db(1/k)) T scene T sys η (%) Tsys/η (K) Single Element 1 Max G/T 5 ~Max Gain 21 Max G/T For details see [1] 14/19
16 Move to Parkes Much lower RFI 12m prime focus dish Test bed for prototype FPAs for ASKAP More powerful beamformer & correlator (data collection much faster) Used with 64m allowing much better SNR 15/19
17 System considerations Real time vs. store and process Ideally use both providing verification: e.g. Parkes system Set up for observation: Beamforming Prototype for final: Real Time Setup easy to fine tune:fringes clearly visible Beamformer committed at observation time Requires more stability Closer to final system operation Store and Process Setup difficult to fine tune Free to apply different beamformers during processing Easier to re-run processing to match different scenarios Interferometer advantages over single dish Allows much lower strength sources to be used Much higher SNR and phase in pattern cuts Less sensitive to gain variations 16/19
18 Conclusions Demonstrated digital beamforming in prototype radio telescope (with an interferometer) System performance was modest but explainable. A team was trained in FPA system design and testing FPA characterization techniques were evaluated and refined Project management issues and lessons for rapid prototyping Early definition of port numbering Nomenclature: Ports, channels, beams, primary pattern... Keep it simple Subsystem testing vs. entire system debugging Propose early integration tests Identify interface issues Clarify specifications Early results Follow by comprehensive review and rework if required 17/19
19 Acknowledgements The NTD Interferometer THEA tile & support from ASTRON CSIRO team Thanks for helpful discussions with: Stuart Hay, John O Sullivan and Mike Kesteven This work is part of a PhD with Macquarie University and funding support from the CSIRO ATNF. More information [1] D. Hayman, R. Beresford, J. Bunton, C. Cantrall, T. Cornwell, A. Grancea, C. Granet, J. Joseph, M. Kesteven, J. O Sullivan, J. Pathikulangara, T. Sweetnam, and M. Voronkov, The NTD interferometer: A phased array feed test bed, Workshop on Applications of Radio Science (WARS08), 2008 [2] Hayman, D. B.; Bird, T. S.; Esselle, K. P.; Hall, P. J.;, "Experimental Demonstration of Focal Plane Array Beamforming in a Prototype Radiotelescope," IEEE Transactions on Antennas and Propagation, June 2010 (already on Xplore) 18/19
20 Questions? 19/19
Array noise temperature measurements at the Parkes PAF Test-bed Facility
Array noise temperature measurements at the Parkes PAF Test-bed Facility Douglas B. Hayman, Aaron P. Chippendale, Robert D. Shaw and Stuart G. Hay MIDPREP 1 April 2014 COMPUTATIONAL INFORMATICS ASTRONOMY
More informationPhased Array Feed Design. Stuart Hay 23 October 2009
Phased Array Feed Design Stuart Hay 23 October 29 Outline Why phased array feeds (PAFs) for radioastronomy? General features and issues of PAF approach Connected-array PAF approach in ASKAP Why PAFs? High
More information1922 IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION, VOL. 58, NO. 6, JUNE 2010
1922 IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION, VOL. 58, NO. 6, JUNE 2010 Experimental Demonstration of Focal Plane Array Beamforming in a Prototype Radiotelescope Douglas Brian Hayman, Member, IEEE,
More informationSmart Antennas in Radio Astronomy
Smart Antennas in Radio Astronomy Wim van Cappellen cappellen@astron.nl Netherlands Institute for Radio Astronomy Our mission is to make radio-astronomical discoveries happen ASTRON is an institute for
More informationRecent Developments in Measuring Signal and Noise in Phased Array Feeds at CSIRO
Recent Developments in Measuring Signal and Noise in Phased Array Feeds at CSIRO A. P. Chippendale, D. McConnell, K. Bannister, N. Nikolic, A. W. Hotan, K. W. Smart, R. D. Shaw, D. B. Hayman, S. G. Hay
More informationReinventing Radio Astronomy PAF Technology. John O Sullivan, Centre for Astronomy and Space Science, CSIRO 2 April 2013
Reinventing Radio Astronomy PAF Technology John O Sullivan, Centre for Astronomy and Space Science, CSIRO 2 April 2013 The origins Beginning of time Optical and later infrared - power detectors/bolometers
More informationPhased Array Feeds for the SKA. WP2.2.3 PAFSKA Consortium CSIRO ASTRON DRAO NRAO BYU OdP Nancay Cornell U Manchester
Phased Array Feeds for the SKA WP2.2.3 PAFSKA Consortium CSIRO ASTRON DRAO NRAO BYU OdP Nancay Cornell U Manchester Dish Array Hierarchy Dish Array L5 Elements PAF Dish Single Pixel Feeds L4 Sub systems
More informationPhased Array Feeds A new technology for multi-beam radio astronomy
Phased Array Feeds A new technology for multi-beam radio astronomy Aidan Hotan ASKAP Deputy Project Scientist 2 nd October 2015 CSIRO ASTRONOMY AND SPACE SCIENCE Outline Review of radio astronomy concepts.
More informationThe Australian SKA Pathfinder Project. ASKAP Digital Signal Processing Systems System Description & Overview of Industry Opportunities
The Australian SKA Pathfinder Project ASKAP Digital Signal Processing Systems System Description & Overview of Industry Opportunities This paper describes the delivery of the digital signal processing
More informationPhased Array Feeds & Primary Beams
Phased Array Feeds & Primary Beams Aidan Hotan ASKAP Deputy Project Scientist 3 rd October 2014 CSIRO ASTRONOMY AND SPACE SCIENCE Outline Review of parabolic (dish) antennas. Focal plane response to a
More informationPhased Array Feeds A new technology for wide-field radio astronomy
Phased Array Feeds A new technology for wide-field radio astronomy Aidan Hotan ASKAP Project Scientist 29 th September 2017 CSIRO ASTRONOMY AND SPACE SCIENCE Outline Review of radio astronomy concepts
More informationPhased Array Feeds for Parkes. Robert Braun Science with 50 Years Young
Phased Array Feeds for Parkes Robert Braun Science with Parkes @ 50 Years Young Outline PAFs in the SKA context PAFSKA activities Apertif, BYU, NRAO, NAIC, DRAO, ASKAP ASKAP PAF MkI ASKAP PAF MkII Parkes:
More informationNumerical Approach for the Analysis and Optimization of Phased Array Feed Systems
Numerical Approach for the Analysis and Optimization of Phased Array Feed Systems The Netherlands Institute for Radio Astronomy (ASTRON) Supported by part: - The Netherlands Organization for Scientific
More informationFocal Plane Arrays & SKA
Focal Plane Arrays & SKA Peter Hall SKA International Project Engineer www.skatelescope.org Dwingeloo, June 20 2005 Outline Today: SKA and antennas Phased arrays and SKA Hybrid SKA possibilities» A hybrid
More informationFocal Plane Array Related Activities at CSIRO
ICT Centre /antennas Focal Plane Array Related Activities at CSIRO Trevor S. Bird (1), Douglas Hayman (1), Suzy Jackson (2) & Dick Ferris (2) (1) CSIRO ICT Centre (2) CSIRO Australia Telescope National
More informationSKA The Australian Perspective
SKA The Australian Perspective Peter J Hall CSIRO SKA Program Leader http://www.atnf.csiro.au/ska Presentation Outline Background Australia and the SKA New seed research program» Philosophy, Working Principles,
More informationIntegrated receivers for mid-band SKA. Suzy Jackson Engineer, Australia Telescope National Facility
Integrated receivers for mid-band SKA Suzy Jackson Engineer, Australia Telescope National Facility ASKAP/SKA Special Technical Brief 23 rd October, 2009 Talk overview Mid band SKA receiver challenges ASKAP
More informationMemo 65 SKA Signal processing costs
Memo 65 SKA Signal processing costs John Bunton, CSIRO ICT Centre 12/08/05 www.skatelescope.org/pages/page_memos.htm Introduction The delay in the building of the SKA has a significant impact on the signal
More informationFocal Plane Array Beamformer for the Expanded GMRT: Initial
Focal Plane Array Beamformer for the Expanded GMRT: Initial Implementation on ROACH Kaushal D. Buch Digital Backend Group, Giant Metrewave Radio Telescope, NCRA-TIFR, Pune, India kdbuch@gmrt.ncra.tifr.res.in
More informationInterference Mitigation Using a Multiple Feed Array for Radio Astronomy
Interference Mitigation Using a Multiple Feed Array for Radio Astronomy Chad Hansen, Karl F Warnick, and Brian D Jeffs Department of Electrical and Computer Engineering Brigham Young University Provo,
More informationSKA Correlator Input Data Rate
SKA Correlator Input Data Rate John D. Bunton, CSIRO ICT Centre 14 November 003 Introduction One of the major costs in the SKA is data transport from the antenna to the central beamformer or correlator.
More informationSKA station cost comparison
SKA station cost comparison John D. Bunton, CSIRO Telecommunications and Industrial Physics 4 August 2003 Introduction Current SKA white papers and updates present cost in a variety of ways which makes
More informationMarch Phased Array Technology. Andrew Faulkner
Aperture Arrays Michael Kramer Sparse Type of AA selection 1000 Sparse AA-low Sky Brightness Temperature (K) 100 10 T sky A eff Fully sampled AA-mid Becoming sparse Aeff / T sys (m 2 / K) Dense A eff /T
More informationTowards SKA Multi-beam concepts and technology
Towards SKA Multi-beam concepts and technology SKA meeting Meudon Observatory, 16 June 2009 Philippe Picard Station de Radioastronomie de Nançay philippe.picard@obs-nancay.fr 1 Square Kilometre Array:
More informationA Method for Gain over Temperature Measurements Using Two Hot Noise Sources
A Method for Gain over Temperature Measurements Using Two Hot Noise Sources Vince Rodriguez and Charles Osborne MI Technologies: Suwanee, 30024 GA, USA vrodriguez@mitechnologies.com Abstract P Gain over
More informationOverview of the SKA. P. Dewdney International SKA Project Engineer Nov 9, 2009
Overview of the SKA P. Dewdney International SKA Project Engineer Nov 9, 2009 Outline* 1. SKA Science Drivers. 2. The SKA System. 3. SKA technologies. 4. Trade-off space. 5. Scaling. 6. Data Rates & Data
More informationRandom Phase Antenna Combining for SETI SETICon03
Random Phase Antenna Combining for SETI SETICon03 Marko Cebokli S57UUU ABSTRACT: Since the direction from which the first ETI signal will arrive is not known in advance, it is possible to relax the phasing
More informationAdded Phase Noise measurement for EMBRACE LO distribution system
Added Phase Noise measurement for EMBRACE LO distribution system G. Bianchi 1, S. Mariotti 1, J. Morawietz 2 1 INAF-IRA (I), 2 ASTRON (NL) 1. Introduction Embrace is a system composed by 150 receivers,
More informationIntegrated receivers for mid-band SKA. Suzy Jackson Engineer, Australia Telescope National Facility
Integrated receivers for mid-band SKA Suzy Jackson Engineer, Australia Telescope National Facility SKADS FP6 Meeting Chateau de Limelette 4-6 November, 2009 Talk overview Mid band SKA receiver challenges
More informationTHE KAROO ARRAY TELESCOPE (KAT) & FPA EFFORT IN SOUTH AFRICA
THE KAROO ARRAY TELESCOPE (KAT) & FPA EFFORT IN SOUTH AFRICA Dr. Dirk Baker (KAT FPA Sub-system Manager) Prof. Justin Jonas (SKA SA Project Scientist) Ms. Anita Loots (KAT Project Manager) Mr. David de
More informationNovember SKA Low Frequency Aperture Array. Andrew Faulkner
SKA Phase 1 Implementation Southern Africa Australia SKA 1 -mid 250 15m dia. Dishes 0.4-3GHz SKA 1 -low 256,000 antennas Aperture Array Stations 50 350/650MHz SKA 1 -survey 90 15m dia. Dishes 0.7-1.7GHz
More informationSKA-low and the Aperture Array Verification System
SKA-low and the Aperture Array Verification System Randall Wayth AADCC Project Scientist On behalf of the Aperture Array Design & Construction Consortium (AADCC) AADCC partners ASTRON (Netherlands) ICRAR/Curtin
More informationFinal Feed Selection Study For the Multi Beam Array System
National Astronomy and Ionosphere Center Arecibo Observatory Focal Array Memo Series Final Feed Selection Study For the Multi Beam Array System By: Germán Cortés-Medellín CORNELL July/19/2002 U n i v e
More informationVery Long Baseline Interferometry
Very Long Baseline Interferometry Cormac Reynolds, JIVE European Radio Interferometry School, Bonn 12 Sept. 2007 VLBI Arrays EVN (Europe, China, South Africa, Arecibo) VLBA (USA) EVN + VLBA coordinate
More informationOPTICS OF SINGLE BEAM, DUAL BEAM & ARRAY RECEIVERS ON LARGE TELESCOPES J A M E S W L A M B, C A L T E C H
OPTICS OF SINGLE BEAM, DUAL BEAM & ARRAY RECEIVERS ON LARGE TELESCOPES J A M E S W L A M B, C A L T E C H OUTLINE Antenna optics Aberrations Diffraction Single feeds Types of feed Bandwidth Imaging feeds
More informationChalmers Publication Library
Chalmers Publication Library Analysis of the strut and feed blockage effects in radio telescopes with compact UWB feeds This document has been downloaded from Chalmers Publication Library (CPL). It is
More informationDelay calibration of the phased array feed using observations of the South celestial pole
ASTRONOMY AND SPACE SCIENCE www.csiro.au Delay calibration of the phased array feed using observations of the South celestial pole Keith Bannister, Aidan Hotan ASKAP Commissioning and Early Science Memo
More informationREPORT ITU-R SA.2098
Rep. ITU-R SA.2098 1 REPORT ITU-R SA.2098 Mathematical gain models of large-aperture space research service earth station antennas for compatibility analysis involving a large number of distributed interference
More informationECE 6390: Satellite Communications and Navigation Systems TEST 1 (Fall 2004)
Name: GTID: ECE 6390: Satellite Communications and Navigation Systems TEST 1 (Fall 2004) Please read all instructions before continuing with the test. This is a closed notes, closed book, closed friend,
More informationDense Aperture Array for SKA
Dense Aperture Array for SKA Steve Torchinsky EMBRACE Why a Square Kilometre? Detection of HI in emission at cosmological distances R. Ekers, SKA Memo #4, 2001 P. Wilkinson, 1991 J. Heidmann, 1966! SKA
More informationMulti-octave radio frequency systems: Developments of antenna technology in radio astronomy and imaging systems
Multi-octave radio frequency systems: Developments of antenna technology in radio astronomy and imaging systems Professor Tony Brown School of Electrical and Electronic Engineering University of Manchester
More informationGAJET, a DRDC Evaluation Testbed for Navigation Electronic Warfare. Michel Clénet
GAJET, a DRDC Evaluation Testbed for Navigation Electronic Warfare Michel Clénet Outline Introduction CRPA project at DRDC Ottawa GAJET: An Evaluation Test bed for GPS Anti-Jam System An AJ simulation
More informationEMBRACE DS5 presentation
EMBRACE presentation Paris 4 th September 2006 ASTRON, The Netherlands Acknowledgement The authors wish to acknowledge the enormous contribution of the whole EMBRACE team presently located at: ASTRON,
More informationDetector Systems. Graeme Carrad
Detector Systems Graeme Carrad November 2011 The Basic Structure of a typical Radio Telescope Antenna Receiver Conversion Digitiser Signal Processing / Correlator They are much the same CSIRO. Radiotelescope
More informationCircular Focal Plane Array for Astronomic Applications
International Workshop on Phased Array Antenna Systems for Radio Astronomy Circular Focal Plane Array for Astronomic Applications Rémi Sarkis, Christophe Craeye May 3-5, 21 Provo, Utah, USA 1 Introduction
More informationPhotonic Integrated Beamformer for Broadband Radio Astronomy
M. Burla, D. A. I. Marpaung, M. R. H. Khan, C. G. H. Roeloffzen Telecommunication Engineering group University of Twente, Enschede, The Netherlands P. Maat, K. Dijkstra ASTRON, Dwingeloo, The Netherlands
More informationKULLIYYAH OF ENGINEERING
KULLIYYAH OF ENGINEERING DEPARTMENT OF ELECTRICAL & COMPUTER ENGINEERING ANTENNA AND WAVE PROPAGATION LABORATORY (ECE 4103) EXPERIMENT NO 3 RADIATION PATTERN AND GAIN CHARACTERISTICS OF THE DISH (PARABOLIC)
More informationSome Notes on Beamforming.
The Medicina IRA-SKA Engineering Group Some Notes on Beamforming. S. Montebugnoli, G. Bianchi, A. Cattani, F. Ghelfi, A. Maccaferri, F. Perini. IRA N. 353/04 1) Introduction: consideration on beamforming
More informationWhy Single Dish? Darrel Emerson NRAO Tucson. NAIC-NRAO School on Single-Dish Radio Astronomy. Green Bank, August 2003.
Why Single Dish? Darrel Emerson NRAO Tucson NAIC-NRAO School on Single-Dish Radio Astronomy. Green Bank, August 2003. Why Single Dish? What's the Alternative? Comparisons between Single-Dish, Phased Array
More informationIntroduction to Radio Astronomy!
Introduction to Radio Astronomy! Sources of radio emission! Radio telescopes - collecting the radiation! Processing the radio signal! Radio telescope characteristics! Observing radio sources Sources of
More informationAntennas. Greg Taylor. University of New Mexico Spring Astronomy 423 at UNM Radio Astronomy
Antennas Greg Taylor University of New Mexico Spring 2011 Astronomy 423 at UNM Radio Astronomy Radio Window 2 spans a wide range of λ and ν from λ ~ 0.33 mm to ~ 20 m! (ν = 1300 GHz to 15 MHz ) Outline
More informationEVLA System Commissioning Results
EVLA System Commissioning Results EVLA Advisory Committee Meeting, March 19-20, 2009 Rick Perley EVLA Project Scientist t 1 Project Requirements EVLA Project Book, Chapter 2, contains the EVLA Project
More informationA Multi-Fielding SKA Covering the Range 100 MHz 22 GHz. Peter Hall and Aaron Chippendale, CSIRO ATNF 24 November 2003
A Multi-Fielding SKA Covering the Range 100 MHz 22 GHz Peter Hall and Aaron Chippendale, CSIRO ATNF 24 November 2003 1. Background Various analyses, including the recent IEMT report [1], have noted that
More informationMAKING TRANSIENT ANTENNA MEASUREMENTS
MAKING TRANSIENT ANTENNA MEASUREMENTS Roger Dygert, Steven R. Nichols MI Technologies, 1125 Satellite Boulevard, Suite 100 Suwanee, GA 30024-4629 ABSTRACT In addition to steady state performance, antennas
More informationASKAP commissioning. Presentation to ATUC. CSIRO Astronomy & Space Science Dave McConnell ASKAP Commissioning & Early Science 14 November 2016
ASKAP commissioning Presentation to ATUC CSIRO Astronomy & Space Science Dave McConnell ASKAP Commissioning & Early Science 14 November 2016 PAF assembly line, Marsfield ASKAP is complicated 36 antennas
More informationEVLA Memo #119 Wide-Band Sensitivity and Frequency Coverage of the EVLA and VLA L-Band Receivers
EVLA Memo #119 Wide-Band Sensitivity and Frequency Coverage of the EVLA and VLA L-Band Receivers Rick Perley and Bob Hayward January 17, 8 Abstract We determine the sensitivities of the EVLA and VLA antennas
More informationActive Impedance Matched Dual-Polarization Phased Array Feed for the GBT
Active Impedance Matched Dual-Polarization Phased Array Feed for the GBT Karl F. Warnick, David Carter, Taylor Webb, Brian D. Jeffs Department of Electrical and Computer Engineering Brigham Young University,
More informationATCA Antenna Beam Patterns and Aperture Illumination
1 AT 39.3/116 ATCA Antenna Beam Patterns and Aperture Illumination Jared Cole and Ravi Subrahmanyan July 2002 Detailed here is a method and results from measurements of the beam characteristics of the
More informationExperimental Verification of RFI Mitigation with a Focal Plane Array Feed
Radio Science, Volume???, Number, Pages 1 8, Experimental Verification of RFI Mitigation with a Focal Plane Array Feed James R. Nagel 1 Lockheed Martin, Inc. Vandenberg Air Force Base, CA 93437 Karl F.
More informationRECOMMENDATION ITU-R M Reference radiation pattern for ship earth station antennas
Rec. ITU-R M.694-1 1 RECOMMENDATION ITU-R M.694-1 Reference radiation pattern for ship earth station antennas (Question ITU-R 88/8) (1990-2005) Scope This Recommendation provides a reference radiation
More informationUWB medical radar with array antenna
UWB medical radar with array antenna UWB Implementations Workshop Jan Hammerstad PhD student FFI MELODY project 04. May 2009 Overview Role within the MELODY project. Stepped frequency continuous wave radar
More informationReflector Antenna, its Mount and Microwave. Absorbers for IIP Radiometer Experiments
Reflector Antenna, its Mount and Microwave Absorbers for IIP Radiometer Experiments Nakasit Niltawach, and Joel T. Johnson May 8 th, 2003 1 Introduction As mentioned in [1], measurements are required for
More informationRECOMMENDATION ITU-R S.733-1* (Question ITU-R 42/4 (1990))**
Rec. ITU-R S.733-1 1 RECOMMENDATION ITU-R S.733-1* DETERMINATION OF THE G/T RATIO FOR EARTH STATIONS OPERATING IN THE FIXED-SATELLITE SERVICE (Question ITU-R 42/4 (1990))** Rec. ITU-R S.733-1 (1992-1993)
More informationWhy Single Dish? Why Single Dish? Darrel Emerson NRAO Tucson
Why Single Dish? Darrel Emerson NRAO Tucson Why Single Dish? What's the Alternative? Comparisons between Single-Dish, Phased Array & Interferometers Advantages and Disadvantages of Correlation Interferometer
More informationAntennas. Greg Taylor. University of New Mexico Spring Astronomy 423 at UNM Radio Astronomy
Antennas Greg Taylor University of New Mexico Spring 2017 Astronomy 423 at UNM Radio Astronomy Outline 2 Fourier Transforms Interferometer block diagram Antenna fundamentals Types of antennas Antenna performance
More informationCalibration Concepts of Multi-Channel Spaceborne SAR
DLR.de Chart 1 > CEOS Workshop 2016 > Tobias Rommel > September 7 th, 2016 Calibration Concepts of Multi-Channel Spaceborne SAR T. Rommel, F. Queiroz de Almeida, S. Huber, M. Jäger, G. Krieger, C. Laux,
More informationDr. John S. Seybold. November 9, IEEE Melbourne COM/SP AP/MTT Chapters
Antennas Dr. John S. Seybold November 9, 004 IEEE Melbourne COM/SP AP/MTT Chapters Introduction The antenna is the air interface of a communication system An antenna is an electrical conductor or system
More informationEMG4066:Antennas and Propagation Exp 1:ANTENNAS MMU:FOE. To study the radiation pattern characteristics of various types of antennas.
OBJECTIVES To study the radiation pattern characteristics of various types of antennas. APPARATUS Microwave Source Rotating Antenna Platform Measurement Interface Transmitting Horn Antenna Dipole and Yagi
More informationELEC4604. RF Electronics. Experiment 1
ELEC464 RF Electronics Experiment ANTENNA RADATO N PATTERNS. ntroduction The performance of RF communication systems depend critically on the radiation characteristics of the antennae it employs. These
More informationTechnologies for Radio Astronomy
Technologies for Radio Astronomy CSIRO Astronomy and Space Science Alex Dunning in lieu of Tasso Tzioumis Facilities Program Director Technologies June 2017 Directions for ATNF Engineering (Update since
More informationTechnologies for Radio Astronomy Mark Bowen Acting Theme Leader Technologies for Radio Astronomy October 2012 CSIRO ASTRONOMY AND SPACE SCIENCE
Technologies for Radio Astronomy Mark Bowen Acting Theme Leader Technologies for Radio Astronomy October 2012 CSIRO ASTRONOMY AND SPACE SCIENCE Outline Current Projects CABB ATCA C/X Upgrade FAST Parkes
More informationWideband Horn Antennas. John Kot, Christophe Granet BAE Systems Australia Ltd
Wideband Horn Antennas John Kot, Christophe Granet BAE Systems Australia Ltd Feed Horn Antennas Horn antennas are widely used as feeds for high efficiency reflectors, for applications such as satellite
More informationNew Trends on Receivers Development" May 30, 2005, Medicina. RECEIVING SYSTEMs for the ANTENNAS OPERATED by the INSTITUTE of RADIOASTRONOMY in ITALY
New Trends on Receivers Development" May 30, 2005, Medicina RECEIVING SYSTEMs for the ANTENNAS OPERATED by the INSTITUTE of RADIOASTRONOMY in ITALY Alessandro Orfei IRA-INAF, Medicina station (Italy) RADIONET
More informationDesign and Test of FPGA-based Direction-of-Arrival Algorithms for Adaptive Array Antennas
2011 IEEE Aerospace Conference Big Sky, MT, March 7, 2011 Session# 3.01 Phased Array Antennas Systems and Beam Forming Technologies Pres #: 3.0102, Paper ID: 1198 Rm: Elbow 3, Time: 8:55am Design and Test
More informationSources classification
Sources classification Radiometry relates to the measurement of the energy radiated by one or more sources in any region of the electromagnetic spectrum. As an antenna, a source, whose largest dimension
More informationRemoval of Radio-frequency Interference (RFI) from Terrestrial Broadcast Stations in the Murchison Widefield Array. A/Prof.
Removal of Radio-frequency Interference (RFI) from Terrestrial Broadcast Stations in the Murchison Widefield Array Present by Supervisors: Chairperson: Bach Nguyen Dr. Adrian Sutinjo A/Prof. Randall Wayth
More informationimages with ASKAP Max Voronkov ASKAP So(ware scien1st 20 November 2012 Astronomy and Space Science
Making images with ASKAP Max Voronkov ASKAP So(ware scien1st 20 November 2012 Astronomy and Space Science Australian Square Kilometre Array Pathfinder Radio interferometer with 36 iden1cal 12m antennas
More informationEnhancing space situational awareness using passive radar from space based emitters of opportunity
Tracking Space Debris Craig Benson School of Engineering and IT Enhancing space situational awareness using passive radar from space based emitters of opportunity Space Debris as a Problem Debris is fast
More informationRadio Interferometers Around the World. Amy J. Mioduszewski (NRAO)
Radio Interferometers Around the World Amy J. Mioduszewski (NRAO) A somewhat biased view of current interferometers Limited to telescopes that exist or are in the process of being built (i.e., I am not
More informationSatellite TVRO G/T calculations
Satellite TVRO G/T calculations From: http://aa.1asphost.com/tonyart/tonyt/applets/tvro/tvro.html Introduction In order to understand the G/T calculations, we must start with some basics. A good starting
More informationWhy Single Dish? Darrel Emerson NRAO Tucson. NAIC-NRAO School on Single-Dish Radio Astronomy. Green Bank, August 2003.
Why Single Dish? Darrel Emerson NRAO Tucson NAIC-NRAO School on Single-Dish Radio Astronomy. Green Bank, August 2003. Why Single Dish? What's the Alternative? Comparisons between Single-Dish, Phased Array
More informationCharacteristics of Smooth-Walled Spline-Profile Horns for Tightly Packed Feed-Array of RATAN-600 Radio Telescope
Characteristics of Smooth-Walled Spline-Profile Horns for Tightly Packed Feed-Array of RATAN-600 Radio Telescope N. POPENKO 1, R. CHERNOBROVKIN 1, I. IVANCHENKO 1, C. GRANET 3, V. KHAIKIN 2 1 Usikov Institute
More informationDual Band Feedhorns for 2304/3456 MHz and 5760/10368 MHz
Dual Band Feedhorns for 2304/3456 MHz and 5760/10368 MHz by Al Ward WB5LUA Microwave Update 97 Sandusky, Ohio Background Numerous articles have been written by WA9HUV, VE4MA, N1BWT and others on the proper
More informationTechnology Drivers, SKA Pathfinders P. Dewdney
Technology Drivers, SKA Pathfinders P. Dewdney Dominion Radio Astrophysical Observatory Herzberg Institute of Astrophysics National Research Council Canada National Research Council Canada Conseil national
More informationSATELLITE SUBSYSTEMS. Networks and Communication Department. Dr. Marwah Ahmed
1 SATELLITE SUBSYSTEMS Networks and Communication Department Dr. Marwah Ahmed Outlines Attitude and Orbit Control System (AOCS) Telemetry, Tracking, Command and Monitoring (TTC & M) Power System Communication
More informationLE/ESSE Payload Design
LE/ESSE4360 - Payload Design 4.3 Communications Satellite Payload - Hardware Elements Earth, Moon, Mars, and Beyond Dr. Jinjun Shan, Professor of Space Engineering Department of Earth and Space Science
More informationMay AA Communications. Portugal
SKA Top-level description A large radio telescope for transformational science Up to 1 million m 2 collecting area Operating from 70 MHz to 10 GHz (4m-3cm) Two or more detector technologies Connected to
More informationBroadband and High Efficiency Single-Layer Reflectarray Using Circular Ring Attached Two Sets of Phase-Delay Lines
Progress In Electromagnetics Research M, Vol. 66, 193 202, 2018 Broadband and High Efficiency Single-Layer Reflectarray Using Circular Ring Attached Two Sets of Phase-Delay Lines Fei Xue 1, *, Hongjian
More informationRadio Astronomy: SKA-Era Interferometry and Other Challenges. Dr Jasper Horrell, SKA SA (and Dr Oleg Smirnov, Rhodes and SKA SA)
Radio Astronomy: SKA-Era Interferometry and Other Challenges Dr Jasper Horrell, SKA SA (and Dr Oleg Smirnov, Rhodes and SKA SA) ASSA Symposium, Cape Town, Oct 2012 Scope SKA antenna types Single dishes
More informationIntermodulation in Active Array Receive Antennas
Intermodulation in Active Array Receive Antennas Klaus Solbach, Universität Duisburg, Hochfrequenztechnik, 47048 Duisburg, Tel. 00-79-86, Fax -498, Email: hft@uni-duisburg.de and Markus Böck, Antenna Technology
More informationW1GHZ W1GHZ W1GHZ W1GHZ W1GHZ W1GHZ W1GHZ W1GHZ
Online Online Online Online Online Online (ex-n1bwt) (ex-n1bwt) (ex-n1bwt) (ex-n1bwt) (ex-n1bwt) (ex-n1bwt) (ex-n1bwt) Online (ex-n1bwt) W1GHZ W1GHZ Microwave Antenna Book Antenna BookOnline W1GHZ W1GHZ
More informationExperimental Characterization of a Large Aperture Array Localization Technique using an SDR Testbench
Experimental Characterization of a Large Aperture Array Localization Technique using an SDR Testbench M. Willerton, D. Yates, V. Goverdovsky and C. Papavassiliou Imperial College London, UK. 30 th November
More informationUsing Frequency Diversity to Improve Measurement Speed Roger Dygert MI Technologies, 1125 Satellite Blvd., Suite 100 Suwanee, GA 30024
Using Frequency Diversity to Improve Measurement Speed Roger Dygert MI Technologies, 1125 Satellite Blvd., Suite 1 Suwanee, GA 324 ABSTRACT Conventional antenna measurement systems use a multiplexer or
More informationFundamentals of Radio Astronomy. Lyle Hoffman, Lafayette College ALFALFA Undergraduate Workshop Arecibo Observatory, 2008 Jan. 13
Fundamentals of Radio Astronomy Lyle Hoffman, Lafayette College ALFALFA Undergraduate Workshop Arecibo Observatory, 2008 Jan. 13 Outline Sources in brief Radiotelescope components Radiotelescope characteristics
More informationHigh Efficiency Planar Arrays and Array Feeds for Satellite Communications
High Efficiency Planar Arrays and Array Feeds for Satellite Communications Zhenchao Yang, Kyle Browning, and Karl Warnick Department of Electrical and Computer Engineering Brigham Young University, Provo,
More informationRF Shielded rooms. Controlled Electromagnetic Environments
RF Shielded rooms Controlled Electromagnetic Environments RF shielded rooms 03 Inner finishing 05 Tempest qualified rooms 05 Radio astronomy applications 06 MRI rooms 07 Controlled Electromagnetic Environments
More informationNUMERICAL OPTIMIZATION OF A SATELLITE SHF NULLING MULTIPLE BEAM ANTENNA
NUMERICAL OPTIMIZATION OF A SATELLITE SHF NULLING MULTIPLE BEAM ANTENNA D. Maiarelli (1), R. Guidi (2), G. Galgani (2), V. Lubrano (1), M. Bandinelli (2) (1) Alcatel Alenia Space Italia, via Saccomuro,
More informationOn the Plane Wave Assumption in Indoor Channel Modelling
On the Plane Wave Assumption in Indoor Channel Modelling Markus Landmann 1 Jun-ichi Takada 1 Ilmenau University of Technology www-emt.tu-ilmenau.de Germany Tokyo Institute of Technology Takada Laboratory
More informationAntenna Engineering Lecture 3: Basic Antenna Parameters
Antenna Engineering Lecture 3: Basic Antenna Parameters ELC 405a Fall 2011 Department of Electronics and Communications Engineering Faculty of Engineering Cairo University 2 Outline 1 Radiation Pattern
More informationThe WVR at Effelsberg. Thomas Krichbaum
The WVR at Effelsberg Alan Roy Ute Teuber Helge Rottmann Thomas Krichbaum Reinhard Keller Dave Graham Walter Alef The Scanning 18-26 GHz WVR for Effelsberg ν = 18.5 GHz to 26.0 GHz Δν = 900 MHz Channels
More information