A5070629896- Pulsars and Gravitational Waves Research
- Radio Astronomy Observations and Technology
- Gamma-ray bursts and supernovae
- Geophysics and Gravity Measurements
- Astrophysics and Cosmic Phenomena
- Antenna Design and Optimization
- Atomic and Subatomic Physics Research
- Astrophysical Phenomena and Observations
- Nuclear Physics and Applications
- Medical Imaging Techniques and Applications
- GNSS positioning and interference
- earthquake and tectonic studies
- Microwave Engineering and Waveguides
- Stellar, planetary, and galactic studies
- Cancer, Hypoxia, and Metabolism
- Nanoplatforms for cancer theranostics
- Galaxies: Formation, Evolution, Phenomena
- Radio Frequency Integrated Circuit Design
- Scientific Research and Discoveries
- Seismology and Earthquake Studies
- Statistical and numerical algorithms
- Digital Filter Design and Implementation
- Particle Accelerators and Free-Electron Lasers
- Superconducting Materials and Applications
- Adaptive optics and wavefront sensing
The University of Sydney
2017-2024
Swinburne University of Technology
2020-2024
Commonwealth Scientific and Industrial Research Organisation
2012-2016
Astronomy and Space
2014-2016
Australia Telescope National Facility
2016
Netherlands Institute for Radio Astronomy
2014
Pinpointing a single fast radio burst Fast bursts (FRBs) are flashes of emission from distant astronomical sources. Two FRBs known to have repeated, but most last just few milliseconds and never seen again. Most telescopes that sensitive poor angular resolutions, so the FRB host galaxies remain unknown. Bannister et al. used dedicated observing mode on interferometer detect localize nonrepeating 180924, then followed up with optical telescope observations (see Perspective by Petroff). They...
We present the first interferometric detections of Fast Radio Bursts (FRBs), an enigmatic new class astrophysical transient. In a 180-day survey Southern sky we discovered 3 FRBs at 843 MHz with UTMOST array, as part commissioning science during major ongoing upgrade. The wide field view ($\approx 9$ deg$^{2}$) is well suited to FRB searches. primary beam covered by 352 partially overlapping fan-beams, each which searched for in real time pulse widths range 0.655 42 ms, and dispersion...
We report a new Fast Radio Burst (FRB) discovered in real-time as part of the UTMOST project at Molonglo Observatory Synthesis Telescope (MOST). FRB170827 is first detected with our low-latency ($< 24$ s), machine-learning-based FRB detection system. The discovery was accompanied by capture voltage data native time and frequency resolution observing system, enabling coherent dedispersion detailed off-line analysis, which have unveiled fine temporal structure. dispersion measure (DM) 176.80...
This paper describes the system architecture of a newly constructed radio telescope - Boolardy Engineering Test Array, which is prototype Australian Square Kilometre Array Pathfinder telescope. Phased array feed technology used to form multiple simultaneous beams per antenna, providing astronomers with unprecedented survey speed. The test described here 6-antenna interferometer, fitted signal processing hardware capable forming at least 9 dual-polarisation simultaneously, allowing several...
The Molonglo Observatory Synthesis Telescope (MOST) is an 18,000 square meter radio telescope situated some 40 km from the city of Canberra, Australia. Its operating band (820-850 MHz) now partly allocated to mobile phone communications, making astronomy challenging. We describe how deployment new digital receivers (RX boxes), Field Programmable Gate Array (FPGA) based filterbanks and server-class computers equipped with 43 GPUs (Graphics Processing Units) has transformed MOST into a...
We report the first radio interferometric search at 843 MHz for fast transients, particularly Fast Radio Bursts (FRBs). The recently recommissioned Swinburne University of Technology's digital backend Molonglo Observatory Synthesis Telescope array (the UTMOST) with its large collecting area (18,000 $\mathrm{m^2}$) and wide instantaneous field view (7.80 $\mathrm{deg^2}$) is expected to be an efficient tool detect FRBs. As interferometer it will capable discerning whether FRBs are truly a...
While pulsars possess exceptional rotational stability, large scale timing studies have revealed at least two distinct types of irregularities in their rotation: red noise and glitches. Using modern Bayesian techniques, we investigated the properties 300 bright southern-sky radio that been observed over 1.0-4.8 years by upgraded Molonglo Observatory Synthesis Telescope (MOST). We reanalysed spin spin-down changes associated with nine previously reported pulsar glitches, report discovery...
We detail a new fast radio burst (FRB) survey with the Molonglo Radio Telescope, in which six FRBs were detected between June 2017 and December 2018. By using real-time FRB detection system, we captured raw voltages for five of events, allowed coherent dedispersion very high time resolution (10.24 $\mu$s) studies bursts. Five show temporal broadening consistent interstellar and/or intergalactic scattering, scattering timescales ranging from 0.16 to 29.1 ms. One burst, FRB181017, shows...
We present an overview and the first results from a large-scale pulsar timing programme that is part of UTMOST project at refurbished Molonglo Observatory Synthesis Radio Telescope (MOST) near Canberra, Australia. currently observe more than 400 mainly bright southern radio pulsars with up to daily cadences. For 205 (8 in binaries, 4 millisecond pulsars) we publish updated models, together their flux densities, density variability, pulse widths 843 MHz, derived observations spanning between...
Abstract We describe the performance of Boolardy Engineering Test Array, prototype for Australian Square Kilometre Array Pathfinder telescope. is first aperture synthesis radio telescope to use phased array feed technology, giving it ability electronically form up nine dual-polarisation beams. report methods developed forming and measuring beams, adaptations that have been made traditional calibration imaging procedures in order allow BETA function as a multi-beam commissioning instrument...
Dedicated surveys using different detection pipelines are being carried out at multiple observatories to find more Fast Radio Bursts (FRBs). Understanding the efficiency of algorithms and survey completeness function is important enable unbiased estimation underlying FRB population properties. One method achieve end-to-end testing system by injecting mock FRBs in live data-stream searching for them blindly. Mock injection particularly effective machine-learning-based classifiers, which...
The third generation of high end Digital Signal Processing (DSP) platforms for the Australian Square Kilometre Array Pathfinder (ASKAP) is called Redback-3. It a purely digital board consisting three primary components; FPGAs DSP, DRAM bulk memory storage and optical communications inter-board communications. motivation strategy hardware significantly different from its predecessors this largely reflected in implementation. moving towards more agile DSP platform radio astronomy...
Radio astronomy instrumentation is continually seeking greater processing bandwidths whilst maintaining output frequency resolutions of order one kHz per channel. With the recent commercial availability multi Giga sample second analog to digital converters, instantaneous hundreds MHz many GHz are now viable for radio applications. This driving design more efficient filter-bank architectures manage significant channelisation task. In this paper we present a new multi-stage ASKAP instrument....
We report the detection of a glitch event in pulsar J1709$-$4429 (also known as B1706$-$44) during regular monitoring observations with Molonglo Observatory Synthesis Telescope (UTMOST). The was found timing operations, which we regularly observe over 400 pulsars up to daily cadence, while commensally searching for Rotating Radio Transients, pulsars, and FRBs. With fractional size $\Delta\nu/\nu \approx 52.4 \times10^{-9}$, reported here is by far smallest this pulsar, attesting efficacy...
Abstract Rare intermittent pulsars pose some of the most challenging questions surrounding pulsar emission mechanism, but typically have relatively minimal low-frequency (≲300 MHz) coverage. We present first detection J1107–5907 with Murchison Widefield Array (MWA) at 154 MHz and simultaneous from recently upgraded Molonglo Observatory Synthesis Telescope (UTMOST) 835 MHz, as part an ongoing observing campaign. During a 30 minute observation, we detected in its bright state for approximately...
ABSTRACT We describe the ongoing ‘survey for magnetars, intermittent pulsars, rotating radio transients, and fast bursts’ (SMIRF), performed using newly refurbished UTMOST telescope. SMIRF repeatedly sweeps southern Galactic plane performing real-time periodicity single pulse searches, is first survey of its kind carried out with an interferometer. facilitated by a robotic scheduler which capable fully autonomous commensal operations. report on observational parameters, data analysis...
We report the first detection of a glitch in radio pulsar PSR J0908$-$4913 (PSR B0906$-$49) during regular timing observations by Molonglo Observatory Synthesis Telescope (MOST) as part UTMOST project.
The Boolardy Engineering Test Array (BETA) is the first prototype of Australian Square Kilometer Pathfinder (ASKAP), a new radio telescope that pioneering use Phased Feed (PAF) technology in astronomy to provide instantaneous wide field-of-view imaging. BETA consists six 12 meter parabolic antennas, each equipped with 188-element PAF at focus and signal processing system capable imaging an 7 square degree bandwidth 300MHz resolution 18kHz. In this paper we describe architecture digital chain...
In order to maximize science returns in radio astronomy there is a constant drive process ever wider instantaneous bandwidths. A key function of telescope signal processing system divide wide input bandwidth into number narrow sub-bands for further and analysis. The polyphase filter-bank channelizer has become the primary technique performing this due its flexibility suitability very efficient implementation FPGA hardware. Furthermore, oversampling filter-banks are gaining popularity role...
There are many challenges in the design of broadband microwave phased array digital beamformers for SKA-Phase 1. The list is not simply limited to funding or time, but rather technology bandwidth, RFI, cooling, coherency, and complexity. However, there have been Commercial Off Shelf (COTS) technological advancements recent times RF, ADC technologies that will ease system ahead. This paper describes an experimental being developed by SKA Dish Consortium SKA1-survey instrument. Phased arrays...
ABSTRACT The Molonglo Cross was first commissioned in 1965, as a transit radio (408 MHz) interferometer with the largest collecting area Southern hemisphere. In 1981, telescope redeveloped an Earth-rotation synthesis using only East–West arm (843 MHz), known Observatory Synthesis Telescope. While revitalized 2010s, (slightly larger) North–South (NS) arm, which consists of two co-linear paraboloid cylindrical reflectors spanning 2 × 778 m 12.7 m, had not been used for over 40 yr. Re-fitting...
For many decades Digital Signal Processing (DSP) nodes have been designed for processing digital data received from arrays of radio telescopes. Common threads in all these are: communications, and memory. Fundamentally the aim each system was to provide greatest operational capability technology available at that time. As systems grew size it became apparent a key performance indicator how communicated. Poor communication could result delayed schedules, reduced higher costs. The Square...