Title:	Bandpass calibration of a wideband spectrometer using coherent pulse injection.
Authors:	Patra, Nipanjana Bray, Justin D. Roberts, Paul Ekers, R.D.
Keywords:	Astronomical instrumentation Pulse calibration Nanosecond pulse generator
Issue Date:	Apr-2017
Publisher:	Springer
Citation:	Experimental Astronomy, 2017, Vol. 43, p119-129
Abstract:	We present a relatively simple time domain method for determining the bandpass response of a system by injecting a nanosecond pulse and capturing the system voltage output. A pulse of sub-nanosecond duration contains all frequency components with nearly constant amplitude up to 1 GHz. Hence, this method can accurately determine the system bandpass response to a broadband signal. In a novel variation on this impulse response method, a train of pulses is coherently accumulated providing precision calibration with a simple system. The basic concept is demonstrated using a pulse generator-accumulator setup realised in a Bedlam board which is a high speed digital signal processing unit. The same system was used at the Parkes radio telescope between 2–13 October 2013 and we demonstrate its powerful diagnostic capability. We also present some initial test data from this experiment.
Description:	Restricted Access. An open-access version is available at arXiv.org (one of the alternative locations)
URI:	http://hdl.handle.net/2289/6736
ISSN:	1572-9508 0922-6435 (Online)
Alternative Location:	http://adsabs.harvard.edu/abs/2017ExA....43..119P http://arxiv.org/abs/1502.05862 http://dx.doi.org/10.1007/s10686-017-9523-8
Copyright:	2017 Springer
Appears in Collections:	Research Papers (A&A)

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