The effect of digitisation on the signal-to-noise ratio of a pulsed radio signal} of a pulsed radio signal

Details The effect of digitisation on the signal-to-noise ratio of a pulsed radio signal} of a pulsed radio signal The effect of digitisation on the signal-to-noise ratio of a pulsed radio signal} of a pulsed radio signal

Nov 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001a%26a...378..700k&link_type=abstract

Astronomy and Astrophysics, v.378, p.700-709 (2001)

Astronomy and Astrophysics

Astrophysics

7

Instrumentation: Miscellaneous, Methods: Data Analysis, Pulsars: General

Scientific paper

We discuss the effect of digitisation on the signal-to-noise ratio of pulsed radio signals. We describe a general n-bit digitiser and show that a symmetric and equidistant digitiser has two free parameters: the threshold and the output value. We derive the best choice of these values for a 1, 1.5, 2, 4 and 8-bit digitiser and calculate the signal-to-noise ratio after digitisation of an undetected signal and of a detected signal with a Gaussian or a chi 2-distribution. Measurements made using PuMa, the new digital pulsar machine at the Westerbork Synthesis Radio Telescope, are presented and are shown to agree with the theoretical response of the digitiser.

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