Bandpass calibration of a wideband spectrometer using coherent pulse injection
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 me...
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| Veröffentlicht in: | Experimental astronomy 2017-04, Vol.43 (2), p.119-129 |
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| container_end_page | 129 |
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| container_issue | 2 |
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| container_title | Experimental astronomy |
| container_volume | 43 |
| creator | Patra, Nipanjana Bray, Justin D. Roberts, Paul Ekers, Ron D. |
| description | 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. |
| doi_str_mv | 10.1007/s10686-017-9523-8 |
| format | Article |
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| ispartof | Experimental astronomy, 2017-04, Vol.43 (2), p.119-129 |
| issn | 0922-6435 1572-9508 |
| language | eng |
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| source | SpringerLink Journals |
| subjects | Accumulators Astronomy Bandpass Broadband Calibration Chemistry and Earth Sciences Computer Science Diagnostic systems Digital signal processing Impulse response Nanosecond pulses Observations and Techniques Original Article Physics Physics and Astronomy Pulse generators Radio telescopes Statistics for Engineering Time domain analysis |
| title | Bandpass calibration of a wideband spectrometer using coherent pulse injection |
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