| Image plane
detection |
| Aperture plane
detection |
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| • | Mechanical vs electronic signal combination |
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| – | electronic
signal processing decreasing rapidly in cost |
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| • | interesting
for SKA |
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| – | new
possibilities for wave-front manipulation |
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| • | adaptive
beam shape control |
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| – | improved
calibration, interference suppression |
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| • | multiple,
simultaneous, independent primary beams |
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