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A GPS time-pulse radiator for measuring time-stamp accuracy of a radio telescope array

 
: Ramudzuli, Z.; Abbott, T.; Schonken, F.; O'Hagan, D.

:

Knott, Peter (ed.) ; Deutsche Gesellschaft für Ortung und Navigation -DGON-; Institute of Electrical and Electronics Engineers -IEEE-:
20th International Radar Symposium, IRS 2019 : Ulm, Germany, 26-28 June 2019
Piscataway, NJ: IEEE, 2019
ISBN: 978-3-7369-9860-5
ISBN: 978-3-7369-9904-6
ISBN: 978-1-7281-0421-8
S.1001-1010
International Radar Symposium (IRS) <20, 2019, Ulm>
Englisch
Konferenzbeitrag
Fraunhofer FHR ()

Abstract
A portable GNSS time-pulse radiator (GTR) device for testing the time-stamp accuracy was developed to independently verify how well each MeerKAT radio telescope antenna and its associated processing stages are aligned to UTC. The telescope's time and frequency reference clock ensemble consists of two hydrogen masers, an ultrastable crystal and GPS disciplined Rubidium clocks. During operation, the GTR radiates a broadband GPS time synchronised RF timing signal at a known distance from the telescope antenna and the corresponding timestamps are compared to the expected value. Recent GTR timing test results from one of MeerKAT's antennas showed that the telescope time and UTC were aligned within the instrument's 100 ns uncertainty.

: http://publica.fraunhofer.de/dokumente/N-624868.html