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I am collecting signal data in the 50 MHz to 300MHz range. The data is stored as a function of time and frequency. What methods can I use to determine what noise is caused by the galaxy once I subtract local radio frequency interference and noise from my instruments?

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One man's noise is another man's signal (if you'll excuse the gender stereotype), so without knowing what it is you're trying to measure there is no way to answer this. Could you give some more information? –  Michael B. Aug 4 at 20:09

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