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Fun fact: we manage to record amplitude and phase of radiowaves, though. That allows us to record them at different points on Earth, ship the recorded data to a
by _Microft 5y ago
Fun fact: we manage to record amplitude and phase of radiowaves, though. That allows us to record them at different points on Earth, ship the recorded data to a datacenter and computationally merge them to get a planet-wide virtual telescope dish with a much better angular resolution that a single telescope dish ever could have.
- ddalex 5y agowe don't record phase, there is no way to recover the phase from a single signal what we do we make sure that all receivers are synchronized, i.e take samples at the exact same time then you can correlate the signal received between dishes (which will arrive at different times due to delays in propagation), and find out the time difference of the signal which then points out to signal origin (beam forming) - this is how phased radar works once you align the signals you can use the minute differences in the signals to compute a synthetic aperture, i.e improving the angular resolution