Beamforming and imaging with the BYU/NRAO L-band 19-element phased array feed

Warnick, Karl F.; Jeffs, Brian D.; Landon, Jonathan; Waldron, Jacob; Jones, David B.; Fisher, J. Richard; Norrod, R.

doi:10.1109/antemursi.2009.4805125

Cited by 24 publications

(14 citation statements)

References 5 publications

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“…These quantities are indirectly measurable through a two-stage measurement procedure that has been proposed by Warnick et al [16]. We will generalize their procedure to also determine the constraint matrix .…”

Section: B Measurement Proceduresmentioning

confidence: 99%

An Optimal Beamforming Strategy for Wide-Field Surveys With Phased-Array-Fed Reflector Antennas

Ivashina

Iupikov

Maaskant

et al. 2011

IEEE Trans. Antennas Propagat.

105

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An optimal beamforming strategy is proposed for performing large-field surveys with dual-polarized phased-array-fed reflector antennas. This strategy uses signal-processing algorithms that maximize the beam sensitivity and the continuity of a field of view (FOV) that is formed by multiple closely overlapping beams. A mathematical framework and a newly developed numerical approach are described to analyze and optimize a phased array feed (PAF) system. The modeling approach has been applied to an experimental PAF system (APERTIF prototype) that is installed on the Westerbork Synthesis Radio Telescope. The resulting beam shapes, sensitivity, and polarization diversity characteristics (such as the beam orthogonality and the intrinsic cross-polarization ratio) are examined over a large FOV and frequency bandwidth. We consider weighting schemes to achieve a conjugate-field matched situation (max. received power), maximum signal-to-noise ratio (SNR), and a reduced SNR scenario but with constraints on the beam shape. The latter improves the rotational symmetry of the beam and reduces the sensitivity ripple, at a modest maximum sensitivity penalty. The obtained numerical results demonstrate a very good agreement with the measurements performed at the telescope.Index Terms-Antenna arrays, array signal processing, focal plane arrays, phased array feeds (PAFs), polarimetry, radio astronomy, reflector antenna feeds, system modeling techniques.

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Section: B Measurement Proceduresmentioning

confidence: 99%

An Optimal Beamforming Strategy for Wide-Field Surveys With Phased-Array-Fed Reflector Antennas

Ivashina

Iupikov

Maaskant

et al. 2011

IEEE Trans. Antennas Propagat.

105

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“…The absorber is then placed over the aperture of this pyramid. This approach has been used by others performing similar measurements [28], [29].…”

Section: A Uncertaintiesmentioning

confidence: 99%

Measuring radiotelescope phased array feed noise and sensitivity

Hayman

Chippendale

Hotan

et al. 2014

The 8th European Conference on Antennas and Propagation (EuCAP 2014)

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Various challenges have arisen in the measurement of phased array feeds for radiotelescopes. We focus here on measuring the equivalent noise temperature and the sensitivity of these feeds. We outline the differences between characterizing phased array feeds compared with traditional single horn feeds and provide results from our experience in developing phased array feeds for the Australian Square Kilometre Array Pathfinder.Index Terms-active arrays, antenna array feeds, phased array feeds, focal plane arrays, antenna measurements, radio astronomy, measurement.

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“…On the right of Fig. 1 FOV assessment of phased array feeds (PAF) has been made on prime focus paraboloid optics, such as the BYU 19-dipole element PAF located on the prime focus of a NRAOs 20m diameter paraboloid antenna [7], or measured reported for the CSIRO checkerboard PAF also at prime focus of a paraboloid reflector [8,9]. In 2010, during the AO-PAF feasibility study, a characterization and measurement of the available FOV of Arecibo radio telescope (AO) shaped optics was made, using the BYU 19-element dipole PAF.…”

Section: Field Of View Assessmentmentioning

confidence: 99%

Arecibo focal phased array feasibility study and instrument concept design

Cortes-Medellin

Campbell

2011

2011 XXXth URSI General Assembly and Scientific Symposium

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We are developing the next generation instrumentation for the Arecibo radiotelescope, consisting of an Lband focal phased array feed (PAF) with an effective field of view (FOV) of approx 20 arcmin in diameter. In 2010 and in part of 2011, as part of this development, we made a feasibility study to address two issues, in particular, necessary to implement this technology: first, to determine the available FOV of a PAF system with the Arecibo shaped optics, and second, the development of a suitable cryogenic concept with the potential of reaching a receiver temperature of 35K. We are presenting the results of this feasibility study and the system concept design of the Arecibo cryogenic phased array feed (AO-PAF).

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Beamforming and imaging with the BYU/NRAO L-band 19-element phased array feed

Cited by 24 publications

References 5 publications

An Optimal Beamforming Strategy for Wide-Field Surveys With Phased-Array-Fed Reflector Antennas

An Optimal Beamforming Strategy for Wide-Field Surveys With Phased-Array-Fed Reflector Antennas

Measuring radiotelescope phased array feed noise and sensitivity

Arecibo focal phased array feasibility study and instrument concept design

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