i nterference mitigation tests at molonglo daniel mitchell, duncan campbell-wilson, frank briggs
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I nterference Mitigation Tests at Molonglo Daniel Mitchell, Duncan Campbell-Wilson, Frank Briggs. Overview. RFI mitigation is likely to play an important role in SKAMP data processing. The wide bandwidth alone will open the telescope up to a much greater level of RFI. - PowerPoint PPT PresentationTRANSCRIPT
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Interference Mitigation Tests at Molonglo
Daniel Mitchell, Duncan Campbell-Wilson, Frank Briggs
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Overview
● RFI mitigation is likely to play an important role in SKAMP data processing.
● The wide bandwidth alone will open the telescope up to a much greater level of RFI.
● Have done some short, preliminary observations with and without RFI to see how effective mitigation is likely to be.
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Preliminary RFI Tests.
● MOST has 88 bays (antennas), which will be cross-correlated with all of the others
➔ 88 input correlator.
● Correlator will have 96 inputs➔ Room for RFI reference antennas.
➔ Use closure relation based "post-correlation" cancellation algorithm to test RFI reduction.
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● RFI - Broad-band noise from the RFI site:➔ Estimated 5000 computer equivalents
➔ Telemetry link to transmitter, variable attenuator & white noise source
● 4 IFs & Sampler box:➔ Two 778m x 12m MOST arms (with bay masking)
➔ Two orthogonal polarisations from the 6m dish
➔ Record to a PC at 16 Msamples / second / IF
RFI Test Range
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Short Baselines (bays E01 & W01)
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Short Baselines (bays E01 & W01)
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Short Baselines (bays E01 & W01)
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Short Baselines (bays E01 & W01)
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Short Baselines (bays E01 & W01)
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Short Baselines (bays E01 & W01)
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Medium Baselines (bays E22 & W22)
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Medium Baselines (bays E22 & W22)
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Medium Baselines (bays E22 & W22)
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Long Baselines (bays E44 & W44)
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Long Baselines (bays E01 & W01)
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Long Baselines (bays E01 & W01)
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Summary
● RFI mitigation is likely to play an important role in SKAMP data processing.
● The wide bandwidth alone will open the telescope up to a much greater level of RFI.
● A preliminary look at cancelling RFI from single bay cross-correlations seemed to work well on three baseline scales.