Phased Array Feed Calibration, Beamforming, and Imaging

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

doi:10.1088/0004-6256/139/3/1154

Cited by 62 publications

(31 citation statements)

References 37 publications

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“…Much more frequent updates are required if maximum sensitivity is to be achieved for each observation by optimising with respect to the local direction dependent noise field, or for spatial nulling of moving or transient RFI (Landon et al 2010;Landon, Jeffs, & Warnick 2012).…”

Section: Beamforming and Calibration Methodsmentioning

confidence: 99%

See 1 more Smart Citation

The Australian Square Kilometre Array Pathfinder: System Architecture and Specifications of the Boolardy Engineering Test Array

Hotan¹,

Bunton²,

Harvey-Smith³

et al. 2014

Publ. Astron. Soc. Aust.

130

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This paper describes the system architecture of a newly constructed radio telescope -the Boolardy engineering test array, which is a prototype of the Australian square kilometre array pathfinder telescope. Phased array feed technology is used to form multiple simultaneous beams per antenna, providing astronomers with unprecedented survey speed. The test array described here is a six-antenna interferometer, fitted with prototype signal processing hardware capable of forming at least nine dual-polarisation beams simultaneously, allowing several square degrees to be imaged in a single pointed observation. The main purpose of the test array is to develop beamforming and wide-field calibration methods for use with the full telescope, but it will also be capable of limited early science demonstrations.

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Section: Beamforming and Calibration Methodsmentioning

confidence: 99%

“…Array signaturev k is estimated as the dominant eigenvector of the generalised eigen equation forR s+n andR n (Landon et al 2010). The dish is steered in a grid pattern to place the source at each desired calibration angle relative to dish bore sight.…”

Section: Beamforming and Calibration Methodsmentioning

confidence: 99%

The Australian Square Kilometre Array Pathfinder: System Architecture and Specifications of the Boolardy Engineering Test Array

Hotan¹,

Bunton²,

Harvey-Smith³

et al. 2014

Publ. Astron. Soc. Aust.

130

View full text Add to dashboard Cite

show abstract

“…Processing of the array elements is typically done in the digital domain, introducing the possibility of optimizing the main lobe or sidelobes (perhaps even dynamically) and performing interference mitigation by nullforming; see, e.g., Landon et al (2010). Experimental phased array feeds have been demonstrated on small axisymmetric prime-fed systems (see in particular Elmer et al 2012) and on Arecibo (Warnick et al 2011) and will soon become the primary (permanent) feed systems for the WSRT and ASKAP (section "Other Prominent Interferometer-Type Radio Telescopes").…”

Section: Single-dish Instrumentsmentioning

confidence: 99%

Antennas in Radio Telescope Systems

Ellingson

2015

Handbook of Antenna Technologies

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Radio astronomy is the study of the universe by measurement of radio frequency emission at frequencies ranging from a few MHz to the far infrared. Signals of interest are typically extraordinarily weak, necessitating large effective aperture and resulting in some of the world's largest antenna systems. Technologies now commonly employed include reflector antennas ("dishes") using horn-type feeds or feed arrays, beamforming arrays consisting of elements ranging from dipoles to large dishes, and interferometry. Many problems in radio astronomy also require very fine angular resolution, leading to aperture synthesis imaging instruments consisting of antennas distributed over apertures ranging from hundreds of meters to intercontinental distances. This chapter provides a brief review of antenna systems used in operational modern radio telescopes and in anticipated new radio telescopes.

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“…Current and Future Instrumentation on the GBT K. O'Neil more beams and will employ the real-time RFI mitigation techniques developed by Warnick, et al at Brigham Young University [5]. Prototype work is currently underway on the new array receiver with wider channel bandwidth (5 MHz vs 0.5 MHz), dual-polarization dipoles, a dewar to cool the LNAs, and an FPGA beam former.…”

Section: Pos(iskaf2010)042mentioning

confidence: 99%

Current and Future Instrumentation on the 100m Green Bank Telescope

O'Neil¹

2010

Proceedings of ISKAF2010 Science Meeting — PoS(ISKAF2010)

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As the world's largest fully steerable single dish telescope, the Robert C. Byrd Green Bank Telescope (GBT) has exceptional sensitivity from 100MHz through 100GHz. To exploit this sensitivity and to ensure the telescope remains at the forefront of science and technology, the GBT has an ongoing development program to provide new instrumentation and infrastructure improvements for the telescope. Here I describe the current state of the GBT as well as the ongoing and future development projects and challenges for the telescope. These include focal plane arrays at 30 and 90GHz, a phased (beam-forming) array at 1GHz, affordable wide-bandwidth digital data transmission lines, state of the art FPGA-based signal processing, very low noise receivers, and image processing of TB data sets.

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Phased Array Feed Calibration, Beamforming, and Imaging

Cited by 62 publications

References 37 publications

The Australian Square Kilometre Array Pathfinder: System Architecture and Specifications of the Boolardy Engineering Test Array

The Australian Square Kilometre Array Pathfinder: System Architecture and Specifications of the Boolardy Engineering Test Array

Antennas in Radio Telescope Systems

Current and Future Instrumentation on the 100m Green Bank Telescope

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