Other
Scientific paper
Jun 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002evn..conf..247r&link_type=abstract
6th European VLBI Network Symposium on New Developments in VLBI Science and Technology, held in Bonn, June 25th-28th 2002, proce
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2
Scientific paper
Pulsar VLBI coordinates when combining with the timing coordinates based on the analysis of time of arrivals of pulsar pulses allows to link quasar and related with the planetary ephemeris dynamical reference frames. Pulsar parallaxes give distances to pulsars directly. Pulsar proper motions along with pulsar ages helps to determine the birth places of pulsars.
The main limiting factors for obtaining maximal accuracy of pulsar positions are 1) low signal to noise ratio (SNR) caused by pulsar weakness and short integration time, 2) fluctuations of electron density in the Earth ionosphere which affects propagation time of pulsar signal. It is possible to increase SNR extending the coherence time to a few hours using the phase-reference technique which excludes the bulk of the phase variations due to clock and atmosphere instabilities (Lestrade cite{lestrade93}). Another way to increase SNR in pulsar VLBI is to use pulsating property of pulsar signal (Sekido cite{sekido94}). It is possible to correlate only when pulse is ``on''. This approach increases SNR ∝ sqrt{P/w}, where P - pulsar period, w - pulse width and requires prediction of pulsar phase and period (Rodin cite{rodin97}).
This paper presents the results of processing Japan - Russia pulsar VLBI observations.
Rodin Alexander
Sekido Mamoru
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