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I nterference 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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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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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.
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