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image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao NRC Publications Arc...arrow_drop_down
image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao
NRC Publications Archive
Conference object . 2020
https://doi.org/10.1117/12.256...
Article . 2020 . Peer-reviewed
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Incoherent clocking for radio telescopes

Authors: Carlson, Brent;

Incoherent clocking for radio telescopes

Abstract

The method of “incoherent clocking” is discussed, wherein all-digital methods using FPGAs and COTS digital fiberoptic modules and commercial (e.g. aerial) fiber routing, along with free-running local oscillators at each antenna, are used to provide a clock and timing solution for “at antenna” digitization for any cost, scale, and frequency of radio telescope. Antenna local oscillator stability (Allan Deviation) requirements are developed, indicating there is virtually no limit in baseline extent that can be handled with this method. Research results and plans, focusing on a hardware “laboratory demonstrator” at 10 Gbps using a Xilinx ZCU111 evaluation board, with external real-world aerial fiber up to 300 km with OEO repeaters, are presented and discussed. As well, although not discussed in this paper, with NRC “Small Teams” funding, 4 antennas of the NRC-Penticton 7-antenna 400-1800 MHz Synthesis Telescope are being outfitted with new feeds, receivers, an at-antenna digitizer, and a “TALON Demonstration Correlator” (developed for the SKA) to test this method on-the-sky.

Keywords

astronomy, commercial off the shelf technology, photonics, radio optics, wavefronts, fiber optics tests, antennas, radio telescopes, optical components, fiber optics

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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
Average
Average
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