Pulsar Time Scale: Development of the Observation System for Pulsar Time Scale

Details Pulsar Time Scale: Development of the Observation System for Pulsar Time Scale Pulsar Time Scale: Development of the Observation System for Pulsar Time Scale

Mar 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999crlrv..45..127h&link_type=abstract

Review of the Communications Research Laboratory, vol. 45, p. 127

Computer Science

Performance

Clocks, Pulsars, Reference Systems, Time Measurement, Frequency Standards, Real Time Operation, Frequency Stability, Atomic Clocks, Digital Systems, Spectrometers

Scientific paper

Millisecond pulsars are attractive as future reference clocks, because of their highly stable pulse timing. Some millisecond pulsars show long time frequency stability on the order of 10-14 above one year, which means they can rival atomic clocks. CRL started a study of millisecond pulsar observation using the 34 m antenna at Kashima Space Research Center in order to apply this precise pulse timing to new frequency reference. In 1992 we developed a preliminary observation system using a filter bank method (500 kHz BW X 16channels) and successfully detected a pulse timing of PSR1937+21. The standard deviation of observed data (sigma) was 18 micro-s. This showed the 34 m antenna's performance for millisecond pulsars, therefore a more sensitive backed system is required for more precise timing observation for weak millisecond pulsar emission. A 34m antenna aperture is not large enough for them. In the newly developed observation system, the reception bandwidth is expanded to 200MHz by using an Acousto-Optic Spectrometer (AOS). This is the first time an AOS has been used in a pulsar timing observation system. A digital processor enables real-time long integration. It is unique to introduce an AOS to pulsar timing observation system. Using this system, we observed a millisecond pulsar PSR1937+21 and successfully improved sigma to 5 micro-s. More precise measurement is expected in the future. In this section, an overview of our millisecond pulsar observation system and preliminary observation results of PSR1937+21 are given.

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