Abstract
A hardware real-time coherent dedispersion filter based on the Reticon 5601A Quad Chirped Transversal Filter is shown to be effective for time-resolution improvement of pulsar measurements. The filter can completely remove the time distortion due to dispersive propagation through the interstellar medium. The maximum bandwidth of the filter is greater than 2 MHz, which yields an ultimate time resolution of about 0.5 μs. The immunity of such a filter to arrival time shifts due to interstellar scintillation spectral modulation makes it particularly useful for precision time of arrival measurements of the millisecond pulsar PSR 1937+214. Integrated into a system for synoptic pulsar measurements, the filter will allow us to improve the precision of extended time interval measurements beyond the current atomic standards, which, in turn, may allow setting of new limits on the existence of gravitational radiation and improve the precision of the solar system ephemeris. The principles of operation, the required support circuitry, and the results of simulations and actual telescope operation are described.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
