Phased array antennas demonstrator as a radio telescope - EMBRACE

Patel, P.D.; Kant, D.; Wal, Erik van der; Ardene, A. van

doi:10.1109/aps.2008.4619303

Cited by 10 publications

(5 citation statements)

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“…2 has been designed. The total bandwidth (beyond 100%) can now be processed at once by the optical beamformer, while in the full electronic system it had to be divided into 40 MHz-wide instantaneous subbands [35]. Such a large percentage bandwidth is made possible by the properties of ORRbased delay units, as discussed in Section 1.…”

Section: Obfn Architecturementioning

confidence: 99%

“…This type of radiating element allows ease of integration and exhibits an active reflection coefficient below −10 dB over the whole frequency band. The 4 × 4 rectangular subarray is a subsection of the EMBRACE tile [35], shown in Fig. 5 (left).…”

Section: A Antenna Array and Front-endmentioning

confidence: 99%

“…5 (left). Each antenna element is connected to a low noise amplifier (LNA), based on a commercially available active device, designed for minimum noise figure and allowing a total system noise temperature well below 100 K [35].…”

Section: A Antenna Array and Front-endmentioning

confidence: 99%

“…In this paper we show the capabilities of the integrated system, providing measured radiation patterns. The employed antenna array is a modified version of a demonstrator previously equipped with a full electronic beamformer (EMBRACE, Electronic Multi Beam Radio Astronomy Concept) [35,36].…”

Section: Introductionmentioning

confidence: 99%

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System integration and radiation pattern measurements of a phased array antenna employing an integrated photonic beamformer for radio astronomy applications

et al. 2012

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In this paper we describe the system integration and the experimental demonstration of a photonically beamformed four-element receiving array antenna for radio astronomy applications. To our knowledge, the work described here is the first demonstration of the squint-free, continuously tunable beamsteering capability offered by an integrated photonic beamformer based on optical ring resonator true-time-delay units, with measured radiation patterns. The integrated beamformer is realized in a low loss, complementary metal-oxide-semiconductor (CMOS) compatible optical waveguide technology. The measurements show a wideband, continuous beamsteering operation over a steering angle of 23.5 degrees and an instantaneous bandwidth of 500 MHz limited only by the measurement setup.

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Section: Obfn Architecturementioning

confidence: 99%

Section: A Antenna Array and Front-endmentioning

confidence: 99%

Section: A Antenna Array and Front-endmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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System integration and radiation pattern measurements of a phased array antenna employing an integrated photonic beamformer for radio astronomy applications

et al. 2012

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“…Real-time UWB beamforming benefits both engineering and scientific applications such as radar [23][24][25][26], navigation [27], wireless communications [18,[28][29][30][31], cognitive radio [32,33], frequency-agile antennas [34], radio astronomy and RF space imaging [35][36][37][38][39][40][41][42][43][44][45], microwave imaging and remote sensing applications [46][47][48]. Radio telescopes [49][50][51][52] such as the square kilometer array (SKA) [53][54][55] requires algorithms for real-time UWB beamforming (70 MHz-1.4 GHz) with multiple beams [56].…”

Section: Review: Beam Filter Designmentioning

confidence: 99%

Digital Architectures for UWB Beamforming Using 2D IIR Spatio-Temporal Frequency-Planar Filters

Kondapalli

Madanayake

Bruton

2012

International Journal of Antennas and Propagation

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A design method and an FPGA-based prototype implementation of massively parallel systolic-array VLSI architectures for 2nd-order and 3rd-order frequency-planar beam plane-wave filters are proposed. Frequency-planar beamforming enables highly-directional UWB RF beams at low computational complexity compared to digital phased-array feed techniques. The array factors of the proposed realizations are simulated and both high-directional selectivity and UWB performance are demonstrated. The proposed architectures operate using 2's complement finite precision digital arithmetic. The real-time throughput is maximized using look-ahead optimization applied locally to each processor in the proposed massively-parallel realization of the filter. From sensitivity theory, it is shown that 15 and 19-bit precision for filter coefficients results in better than 3% error for 2nd- and 3rd-order beam filters. Folding together with Ktimes multiplexing is applied to the proposed beam architectures such that throughput can be traded forK-fold lower complexity for realizing the 2-D fan filter banks. Prototype FPGA circuit implementations of these filters are proposed using a Virtex 6 xc6vsx475t-2ff1759 device. The FPGA-prototyped architectures are evaluated using area (A), critical path delay (T), and metricsATandAT2. TheL2error energy is used as a metric for evaluating fixed-point noise levels and the accuracy of the finite precision digital arithmetic circuits.

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