EMBRACE: A Multi-Beam 20,000-Element Radio Astronomical Phased Array Antenna Demonstrator

Kant, G. W.; Patel, P.D.; Wijnholds, Stefan J.; Ruiter, M.; Wal, Erik van der

doi:10.1109/tap.2011.2122233

Cited by 118 publications

(39 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The Vivaldi antenna element in [10], which most closely meets the wide-band requirements of the project, was chosen as a reference: it has the relative bandwidth greater than 6:1 over wide scan range (±45 deg). Since the geometry of the referred TSA in [10] is for the frequency band of 0.4-1.6 GHz, we have scaled up this design with some modifications related to the following practical implementation aspects:…”

Section: Array Antenna Designmentioning

confidence: 99%

Prediction of far-field pattern characteristics of phased array fed reflector antennas by modeling only a small part of the array — Case study of spaceborne radiometer antennas

Iupikov

Roev

Ivashina

2017

2017 11th European Conference on Antennas and Propagation (EUCAP)

View full text Add to dashboard Cite

Abstract-In this work we present an approach of simplified analysis of focal plane array (FPA) systems, in which phasedshifted versions of the simulated embedded element pattern (EEP) of the center element are used to compose a set of all EEPs of the full-scale array and thereafter combined with the optimum weighting coefficients in order to find the total pattern of the feed. Although, the EEPs of dense array antennas are generally not identical (due to the array antenna mutual coupling and edge truncation effects), for typical FPA excitation scenarios, where the array edge elements have relatively low weights to produce the desired illumination of the reflector, this simplified approach has been found sufficiently accurate.

show abstract

Section: Array Antenna Designmentioning

confidence: 99%

Prediction of far-field pattern characteristics of phased array fed reflector antennas by modeling only a small part of the array — Case study of spaceborne radiometer antennas

Iupikov

Roev

Ivashina

2017

2017 11th European Conference on Antennas and Propagation (EUCAP)

View full text Add to dashboard Cite

show abstract

“…Figure 2 shows a demonstrator arrangement as a step to prove the feasibility of the concept for radio astronomy and the SKA. Designated EMBRACE [11], it has two stations one in the Netherlands at the Westerbork Radio Observatory with a collecting area of about 150m 2 (as shown in the picture) and another at Nancay Radio Observatory in France. EMBRACE operates in the frequency band 500-1500MHz and the electronics allows for two fully independently steerable beams on the sky.…”

Section: Wide Field Multi Aperture Arraysmentioning

confidence: 99%

“…At lower frequencies the large programs for Aperture Arrays are LOFAR [10] at low frequencies i.e. 30-240MHz and EMBRACE [11] from 500-1500MHz. L-band interferometric phased Focal Plane Arrays or Phased Arrays Feeds (PAF's) have been demonstrated by the APERTIF system at the Westerbork Synthesis Radio Telescope [6].…”

Section: Introductionmentioning

confidence: 99%

SKA antenna systems; Outlook for non-astronomy applications

Ardenne

Bentum

Boonstra

2012

2012 6th European Conference on Antennas and Propagation (EUCAP)

View full text Add to dashboard Cite

The globally endorsed Square Kilometre Array project primarily aims to advance high sensitivity radio astronomy using a distributed collection of radio telescope stations spiraling outward from the core along three to five arms out to 3000km. This planned highly sensitive instrument covering a frequency range from 70MHz up to 10GHz will be used as wideband, high resolution, wide observing field interferometer of which the first phase will be realized this decade. With these SKA telescope capabilities and with the underlying technologies, there are many space related applications outside the immediate radio astronomy domain especially in the ground segment area. Examples are tracking space debris, precision orbit determination, simultaneous deep space tracking of multiple spacecrafts, GNSS and for other ground segment applications such as search and rescue tracking. After a brief introduction to the SKA, this paper will explore these potential application areas using the SKA based on its underlying approaches in the antenna and receiving subsystems.

show abstract

“…Applications of antenna array-based electronically steerable directional beamformers can be found in a range of areas such as mobile communications, radar [1,2], microwave sensing, long-range detection and target tracking, cognitive radio and radio telescope arrays [3][4][5]. Ultra-wideband (UWB) beamforming on a uniform linear array (ULA) of broadband antennas [6,7] enables directional-selective enhancement of propagating far-field uniform plane wave signals having a given direction of arrival (DOA).…”

Section: Introductionmentioning

confidence: 99%

Multidimensional-DSP Beamformers Using the ROACH-2 FPGA Platform

2017

View full text Add to dashboard Cite

Antenna array-based multi-dimensional infinite-impulse response (IIR) digital beamformers are employed in a multitude of radio frequency (RF) applications ranging from electronically-scanned radar, radio telescopes, long-range detection and target tracking. A method to design 3D IIR beam filters using 2D IIR beam filters is described. A cascaded 2D IIR beam filter architecture is proposed based on systolic array architecture as an alternative for an existing radar application. Differential-form transfer function and polyphase structures are employed in the design to gain an increase in the speed of operation to gigahertz range. The feasibility of practical implementation of a 4-phase polyphase 2D IIR beam filter is explored. A digital hardware prototype is designed, implemented and tested using a ROACH-2 Field Programmable Gate Array (FPGA) platform fitted with a Xilinx Virtex-6 SX475T FPGA chip and multi-input analog-to-digital converters (ADC) boards set to a maximum sampling rate of 960 MHz. The article describes a method to build a 3D IIR beamformer using polyphase structures. A comparison of technical specifications of an existing radar application based on phased-array and the proposed 3D IIR beamformer is also explained to illustrate the proposed method to be a better alternative for such applications.

show abstract

EMBRACE: A Multi-Beam 20,000-Element Radio Astronomical Phased Array Antenna Demonstrator

Cited by 118 publications

References 23 publications

Prediction of far-field pattern characteristics of phased array fed reflector antennas by modeling only a small part of the array — Case study of spaceborne radiometer antennas

Prediction of far-field pattern characteristics of phased array fed reflector antennas by modeling only a small part of the array — Case study of spaceborne radiometer antennas

SKA antenna systems; Outlook for non-astronomy applications

Multidimensional-DSP Beamformers Using the ROACH-2 FPGA Platform

Contact Info

Product

Resources

About