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I nterference Mitigation Tests at Molonglo Daniel Mitchell, Duncan Campbell-Wilson, Frank Briggs

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.

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I nterference Mitigation Tests at Molonglo Daniel Mitchell, Duncan Campbell-Wilson, Frank Briggs

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  1. Interference Mitigation Tests at MolongloDaniel Mitchell, Duncan Campbell-Wilson, Frank Briggs

  2. 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.

  3. 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. Preliminary RFI Tests.

  4. RFI Test Range • 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

  5. Short Baselines (bays E01 & W01)

  6. Short Baselines (bays E01 & W01)

  7. Short Baselines (bays E01 & W01)

  8. Short Baselines (bays E01 & W01)

  9. Short Baselines (bays E01 & W01)

  10. Short Baselines (bays E01 & W01)

  11. Medium Baselines (bays E22 & W22)

  12. Medium Baselines (bays E22 & W22)

  13. Medium Baselines (bays E22 & W22)

  14. Long Baselines (bays E44 & W44)

  15. Long Baselines (bays E01 & W01)

  16. Long Baselines (bays E01 & W01)

  17. 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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