un:radio-interferometer
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| A two-element radio interferometer is the simplest building block of aperture-synthesis radio astronomy. It consists of two spatially separated antennas whose voltage outputs are multiplied and time-averaged by a *correlator*. Even very large arrays with \(N \gg 2\) antennas can be understood as a collection of \(N(N-1)/ | A two-element radio interferometer is the simplest building block of aperture-synthesis radio astronomy. It consists of two spatially separated antennas whose voltage outputs are multiplied and time-averaged by a *correlator*. Even very large arrays with \(N \gg 2\) antennas can be understood as a collection of \(N(N-1)/ | ||
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| Consider two identical antennas separated by a baseline vector \(\vec{b}\) of length \(b\), pointing toward a distant source in the direction of the unit vector \(\hat{s}\). If the angle between \(\vec{b}\) and \(\hat{s}\) is \(\theta\), then the plane wave from the source arrives at the two antennas at slightly different times. The extra path the wavefront travels to reach antenna 1 is | Consider two identical antennas separated by a baseline vector \(\vec{b}\) of length \(b\), pointing toward a distant source in the direction of the unit vector \(\hat{s}\). If the angle between \(\vec{b}\) and \(\hat{s}\) is \(\theta\), then the plane wave from the source arrives at the two antennas at slightly different times. The extra path the wavefront travels to reach antenna 1 is | ||
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