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The UTMOST: A Hybrid Digital Signal Processor Transforms the Molonglo Observatory Synthesis Telescope

  • M. Bailes (a1) (a2), A. Jameson (a1) (a2), C. Flynn (a1) (a2), T. Bateman (a3) (a4), E. D. Barr (a1) (a2) (a5), S. Bhandari (a1) (a2), J. D. Bunton (a4), M. Caleb (a1) (a2) (a6), D. Campbell-Wilson (a2) (a3), W. Farah (a1), B. Gaensler (a2) (a3) (a7), A. J. Green (a2) (a3), R. W. Hunstead (a3), F. Jankowski (a1) (a2), E. F. Keane (a1) (a2) (a8), V. Venkatraman Krishnan (a1) (a2), Tara Murphy (a2) (a3), M. O’Neill (a1), S. Osłowski (a1), A. Parthasarathy (a1) (a2), V. Ravi (a1) (a2) (a9), P. Rosado (a1) and D. Temby (a3)...


The Molonglo Observatory Synthesis Telescope (MOST) is an 18000 m2 radio telescope located 40 km from Canberra, Australia. Its operating band (820–851 MHz) is partly allocated to telecommunications, making radio astronomy challenging. We describe how the deployment of new digital receivers, Field Programmable Gate Array-based filterbanks, and server-class computers equipped with 43 Graphics Processing Units, has transformed the telescope into a versatile new instrument (UTMOST) for studying the radio sky on millisecond timescales. UTMOST has 10 times the bandwidth and double the field of view compared to the MOST, and voltage record and playback capability has facilitated rapid implementaton of many new observing modes, most of which operate commensally. UTMOST can simultaneously excise interference, make maps, coherently dedisperse pulsars, and perform real-time searches of coherent fan-beams for dispersed single pulses. UTMOST operates as a robotic facility, deciding how to efficiently target pulsars and how long to stay on source via real-time pulsar folding, while searching for single pulse events. Regular timing of over 300 pulsars has yielded seven pulsar glitches and three Fast Radio Bursts during commissioning. UTMOST demonstrates that if sufficient signal processing is applied to voltage streams, innovative science remains possible even in hostile radio frequency environments.


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Adams, T. J., Bunton, J. D., & Kesteven, M. J. 2004, ExA, 17, 279 10.1007/s10686-005-2861-y
Bailes, M. 2009, Proceedings of the International Astronomical Union, 5, 212 10.1017/s1743921309990421
Barnbaum, C., & Bradley, R. F. 1998, AJ, 116, 2598 10.1086/300604 1998AJ....116.2598B
Bock, D. C.-J., Large, M. I., & Sadler, E. M. 1999, AJ, 117, 1578 10.1086/300786
Burgess, A. M., & Hunstead, R. W. 2006, AJ, 131, 100 10.1086/498677 2006AJ....131..100B
Caleb, M., et al. 2016a, MNRAS, 458, 718
Caleb, M., et al. 2016b, MNRAS, 458, 718 10.1093/mnras/stw109 2016MNRAS.458..718C
Caleb, M., et al. 2017, MNRAS, 468, 3746 10.1093/mnras/stx638 2017MNRAS.468.3746C
Clark, M. A., Plante, P. L., & Greenhill, L. J. 2012, International Journal of High Performance Computing Applications, 27, 178 10.1177/1094342012444794
de Souza, L., Bunton, J. D., Campbell-Wilson, D., Cappallo, R. J., & Kincaid, B. 2007, in 2007 International Conference on Field Programmable Logic and Applications, “A Radio Astronomy Correlator Optimized for the Xilinx Virtex-4 SX FPGA”, p62–67
della Valle, M., Campbell-Wilson, D., & Hunstead, R. 1994, IAU Circ., 6052
Deller, A. T., Tingay, S. J., Bailes, M., & West, C. 2007, PASP, 119, 318 10.1086/513572
DuPlain, R., Ransom, S., Demorest, P., Brandt, P., Ford, J., & Shelton, A. L., in Advanced Software and Control for Astronomy II. SPIE, eds. Bridger, A., & Radziwill, N. M., doi:10.1117/12.790003, 70191D
Escoffier, R. P., et al. 2007, A&A, 462, 801 10.1051/0004-6361:20054519 2007A&A...462..801E
Gaensler, B. M., & Hunstead, R. W. 2000, PASA, 17, 72 10.1071/AS00072 2000PASA...17...72G
Green, A. J., Cram, L. E., Large, M. I., & Ye, T. 1999, ApJS, 122, 207 10.1086/313208 1999ApJS..122..207G
Green, A. J., Reeves, S. N., & Murphy, T. 2014, PASA, 31, e042 10.1017/pasa.2014.37 2014PASA...31...42G
Greenhill, L. J., Kocz, J., Barsdell, B. R., & Clark, M. A., 2014, in Exascale Radio Astronomy, AAS Topical Conference Series Vol. 2. Proceedings of the conference held 30 March - 4 April, 2014 in Monterey, California. Bulletin of the American Astronomical Society, Vol. 46, #3, #103.01
Jankowski, F., et al. 2015a, ATel, 2015ATel.6903....1J6903
Jankowski, F., et al. 2015b, ATel, 2015ATel.8298....1J8298
Jankowski, F., et al. 2016, The ATel, 9054, 1 2015ATel.NNNN....9054.1J
Keane, E. F., & Petroff, E. 2015, MNRAS, 447, 2852 10.1093/mnras/stu2650 2015MNRAS.447.2852K
Keane, E. F., et al. 2017, preprint (arXiv:1706.04459)2017arXiv170604459K
Large, M. I., Vaughan, A. E., & Mills, B. Y. 1968, Nature, 220, 340 10.1038/220340a0
Macquart, J. P., Keane, E., Grainge, K., McQuinn, M., Fender, R., Hessels, J., Deller, A., Bhat, R., Breton, R., Chatterjee, S., Law, C., Lorimer, D., Ofek, E. O., Pietka, M., Spitler, L., Stappers, B., Trott, C. 2015, Proceedings of Advancing Astrophysics with the Square Kilometre Array (AASKA14). 9 -13 June, 2014. Giardini Naxos, Italy.
Manchester, R. N., Lyne, A. G., Taylor, J. H., Durdin, J. M., Large, M. I., & Little, A. G. 1978, MNRAS, 185, 409 10.1093/mnras/185.2.409
Mauch, T., Murphy, T., Buttery, H. J., Curran, J., Hunstead, R. W., Piestrzynski, B., Robertson, J. G., & Sadler, E. M. 2003, MNRAS, 342, 1117 10.1046/j.1365-8711.2003.06605.x
Murphy, T., Mauch, T., Green, A., Hunstead, R. W., Piestrzynska, B., Kels, A. P., & Sztajer, P. 2007, MNRAS, 382, 382 10.1111/j.1365-2966.2007.12379.x 2007MNRAS.382..382M
Nita, G. M., & Gary, D. E. 2010a, PASP, 122, 595 10.1086/652409 2010PASP..122..595N
Nita, G. M., & Gary, D. E. 2010b, MNRAS, 406, L60 10.1111/j.1745-3933.2010.00882.x 2010MNRAS.406L..60N
Robertson, J. 1991, AuJPh, 44, 729 10.1071/ph910729
Spitler, L. G., et al. 2016, Nature, 531, 202 10.1038/nature17168 2016Natur.531..202S
Staveley-Smith, L., et al. 1992, Nature, 355, 147 10.1038/355147a0
Tendulkar, S. P., et al. 2017, ApJ, 834, L7 10.3847/2041-8213/834/2/L7 2017ApJ...834L...7T
Tingay, S. J., et al. 2013, PASA, 30, e007 21 10.1017/pasa.2012.007
Turtle, A. J., et al. 1987, Nature, 327, 38 10.1038/327038a0
van Straten, W., & Bailes, M. 2011, PASA, 28, 1 10.1071/as10021
Whiteoak, J. B., & Green, A. J. 1996, A&AS, 118, 329 10.1051/aas:1996202
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Publications of the Astronomical Society of Australia
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