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Measurement of minute distances or movements by interaction of waves of electromagnetic energy.
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The real advantage for radioastronomy, says Burns, is to use a radiotelescope on the moon in an interferometric array with one or more on earth, an arrangement he calls a Moon-Earth Radio Interferometer (MERI).
Contrarily to traditional iterative least-squares solver, Non-Linear Kalman filters are fundamentally recursive and opens the way to use radio interferometers "streaming" mode.
Kawase (aerospace engineering, National Defense Academy) explains how radio interferometers can be used to track and monitor the orbits of geostationary satellites in the increasingly overcrowded environment of space.