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Post-Correlation Interference Mitigation. M. Kesteven & R. Sault Australia Telescope National Facility [email protected] IUCAF – Bonn, March, 2001. Post-Correlation RFI excision. Overview of the scheme Application 1 - Single Dish Application 2 - Synthesis Array Problems/Limitations

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Post correlation interference mitigation

Post-Correlation Interference Mitigation

M. Kesteven & R. Sault

Australia Telescope National Facility

[email protected]

IUCAF – Bonn, March, 2001


Post correlation rfi excision
Post-Correlation RFI excision

  • Overview of the scheme

  • Application 1 - Single Dish

  • Application 2 - Synthesis Array

  • Problems/Limitations

  • Comparison with Adaptive Filters

  • Parametric Filter - Glonass excision


Features
Features

  • A Post-Correlation equivalent to an Adaptive Filter

  • Applicable to Single Dish observations

  • Applicable to Synthesis Array observations

  • Performance comparable to the Adaptive Filter

  • Can be implemented with current hardware




Single Dish - Autocorrelation

Reference antenna

Parkes 64m



Post correlation features
Post-Correlation - Features

  • Tolerant to small number of sampler bits

  • Tolerant to multi-pathing interference

  • Tolerant to significant delays between the reference and the astronomy antenna

  • Tolerant to offset between the array tracking centre and the interference location

  • Only one reference antenna required even for an array filter






Array notes
ARRAY - notes

  • Require one Reference Antenna + conversion chain

  • Require Additional Correlator resources. Equivalent to adding one extra antenna to the array.

  • Enjoys all the flexibility of the observatory correlator

  • Makes no assumption as to similarity between antennas of the array. Interference may enter via different sidelobes in different antennas.

  • The corrections are based on the correlator output – therefore works with few-bit samplers.





Post correlation theory
Post-Correlation - Theory

The correction spectrum Vc(f) is given by:






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