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Spatial Filtering with a multibeam receiver.
Radio frequency interference removal through the application of spatial filtering techniques on the Parkes Multibeam receiver. Jonathon Kocz Swinburne University of Technology
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Spatial Filtering
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Parkes Multibeam Experiment
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Results 8MHz bandwidth, 32kHz channels
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Results 8MHz bandwidth, 32kHz channels
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Results 8MHz bandwidth, 32kHz channels
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Vela 8MHz bandwidth, 16kHz channels
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Problems! Interference Free Before Subtraction After Subtraction
(One timestep = 1ms)
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Vela - Polarized Interference Free (SNR: 28.91) Before Subtraction
After Subtraction (SNR: 16.54) (One timestep = 1ms)
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Risks! Interference Free (SNR: 28.91)
Interference free, after subtraction (One timestep = 1ms)
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Vela - Polarized Interference Free (SNR: 28.91) Before Subtraction
After Subtraction (SNR: 20.86) (One timestep = 1ms)
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Limitations and moving forward
AGC – Need new data path BPSR & CASPSR Data rate – Only process subsets?
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Conclusions Spatial filtering with a multibeam receiver is highly effective. SNR recovered to 70% of the interference free case. New system: larger bandwidth, digital data path (no AGC!), real-time processing.
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