scholarly journals Coherent Dedispersion: History and Results

2017 ◽  
Vol 13 (S337) ◽  
pp. 29-32
Author(s):  
Timothy H. Hankins
Keyword(s):  
Radio Emission ◽  
Real Time ◽  
Time Resolution ◽  
High Time ◽  
High Time Resolution ◽  
Emission Mechanism ◽  
Real Time Processing ◽  
Time Processing ◽  
Pulsar Timing

AbstractThe high time resolution afforded by coherent dedispersion has enabled precision pulsar timing, detailed studies of pulsar morphology, and has led to conclusions about the radio emission mechanism. The advance of technology in the last 50 years has enhanced the capability of coherent dedispersion, now used for most pulsar observing, by nearly six orders of magnitude. Although coherent dedispersion is now done mostly in software, in “earlier days” several novel hardware devices for real-time processing were developed.

High Time Resolution Infrared Observations of the Crab Nebula Pulsar and the Pulsar Emission Mechanism

1997 ◽  
Vol 477 (1) ◽  
pp. 465-474 ◽  
Author(s):  
S. S. Eikenberry ◽  
G. G. Fazio ◽  
S. M. Ransom ◽  
J. Middleditch ◽  
J. Kristian ◽  
...  
Keyword(s):  
Time Resolution ◽  
Crab Nebula ◽  
High Time ◽  
High Time Resolution ◽  
Emission Mechanism ◽  
Pulsar Emission ◽  
Infrared Observations ◽  
The Crab Nebula

scholarly journals A real-time, all-sky, high time resolution, direct imager for the long wavelength array

2019 ◽  
Vol 486 (4) ◽  
pp. 5052-5060 ◽  
Author(s):  
James Kent ◽  
Jayce Dowell ◽  
Adam Beardsley ◽  
Nithyanandan Thyagarajan ◽  
Greg Taylor ◽  
...  
Keyword(s):  
Real Time ◽  
Time Resolution ◽  
High Time ◽  
High Time Resolution ◽  
Long Wavelength

scholarly journals Single Pulse Polarimetry of the Vela Pulsar

2000 ◽  
Vol 177 ◽  
pp. 257-260
Author(s):  
Jeffrey S. Kern ◽  
Timothy H. Hankins ◽  
Joanna M. Rankin
Keyword(s):  
Radio Emission ◽  
Time Resolution ◽  
Single Pulse ◽  
Time Dependent ◽  
High Time ◽  
Emission Region ◽  
High Time Resolution ◽  
Spectral Indices ◽  
Vela Pulsar

AbstractMulti-frequency, single-pulse polarimetric observations of the Vela pulsar have been made using the VLA. These high time resolution measurements allow us to probe the geometry, and the time dependent characteristics of the radio emission region. Evidence for multiple emission components with differing spectral indices is found.

scholarly journals Polarimetric Observations of PSR J0437–4715

1996 ◽  
Vol 160 ◽  
pp. 249-251
Author(s):  
José Navarro ◽  
R. N. Manchester
Keyword(s):  
Neutron Star ◽  
Radio Emission ◽  
Time Resolution ◽  
High Time Resolution ◽  
Millisecond Pulsar ◽  
Millisecond Pulsars ◽  
Large Bandwidth ◽  
Pulsar Timing ◽  
Field Geometry ◽  
Star Surface

To date there have been few polarimetric observations of millisecond pulsars, mainly due to the instrumental challenge of simultaneous high time resolution and large bandwidth. Such observations provide our most direct clues to the structure of the magnetic fields around pulsars, and are especially important in the case of millisecond pulsars, where radio emission necessarily originates very close to the neutron star surface.We have observed the bright millisecond pulsar J0437–4715 at the Parkes Radiotelescope with the Caltech Fast Pulsar Timing Machine, at several radio frequencies and in full polarimetric mode. Our analyses show significant deviations from the standard dipole field geometry.

scholarly journals The High Time and Frequency Resolution Capabilities of the Murchison Widefield Array

2015 ◽  
Vol 32 ◽  
Author(s):  
S. E. Tremblay ◽  
S. M. Ord ◽  
N. D. R. Bhat ◽  
S. J. Tingay ◽  
B. Crosse ◽  
...  
Keyword(s):  
Radio Emission ◽  
Time Resolution ◽  
High Time ◽  
Frequency Resolution ◽  
High Time Resolution ◽  
Radio Bursts ◽  
Radio Telescopes ◽  
Initial Design ◽  
Imaging Telescope ◽  
Murchison Widefield Array

AbstractThe science cases for incorporating high time resolution capabilities into modern radio telescopes are as numerous as they are compelling. Science targets range from exotic sources such as pulsars, to our Sun, to recently detected possible extragalactic bursts of radio emission, the so-called fast radio bursts (FRBs). Originally conceived purely as an imaging telescope, the initial design of the Murchison Widefield Array (MWA) did not include the ability to access high time and frequency resolution voltage data. However, the flexibility of the MWA’s software correlator allowed an off-the-shelf solution for adding this capability. This paper describes the system that records the 100 μs and 10 kHz resolution voltage data from the MWA. Example science applications, where this capability is critical, are presented, as well as accompanying commissioning results from this mode to demonstrate verification.

scholarly journals Post-processing Method to Reduce Noise while Preserving High Time Resolution in Aethalometer Real-time Black Carbon Data

2011 ◽  
Vol 11 (5) ◽  
pp. 539-546 ◽  
Author(s):  
Gayle S.W. Hagler ◽  
Tiffany L.B. Yelverton ◽  
Ram Vedantham ◽  
Anthony D.A. Hansen ◽  
Jay R. Turner
Keyword(s):  
Real Time ◽  
Black Carbon ◽  
Time Resolution ◽  
Processing Method ◽  
High Time ◽  
High Time Resolution ◽  
Post Processing

scholarly journals LOFT-e: Localisation Of Fast Transients with e-MERLIN

2017 ◽  
Vol 13 (S337) ◽  
pp. 422-423
Author(s):  
C. R. H. Walker ◽  
R. P. Breton ◽  
P. A. Harrison ◽  
A. Holloway ◽  
M. J. Keith ◽  
...  
Keyword(s):  
Full Advantage ◽  
Real Time ◽  
Time Resolution ◽  
Observation Time ◽  
Field Of View ◽  
High Time ◽  
High Time Resolution ◽  
Radio Bursts ◽  
Raw Data ◽  
Fast Transients

AbstractThe majority of fast radio bursts (FRBs) are poorly localised, hindering their potential scientific yield as galactic, intergalactic, and cosmological probes. LOFT-e, a digital backend for the U.K.’s e-MERLIN seven-telescope interferometer will provide commensal search and real-time detection of FRBs, taking full advantage of its field of view (FoV), sensitivity, and observation time. Upon burst detection, LOFT-e will store raw data offline, enabling the sub-arcsecond localisation provided by e-MERLIN and expanding the pool of localised FRBs. The high-time resolution backend will additionally introduce pulsar observing capabilities to e-MERLIN.

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