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[[Image:Filter mit Antrieb02.jpg|thumb|An industrial water filter with geared motor]] A '''water filter''' is a device which removes impurities from water by means of a fine physi

...satellite's internal orbital model. The updates are created by a [[Kalman Filter]] which uses inputs from the ground monitoring stations, space weather info ...d, specialized antennas may be used. Short delay reflections are harder to filter out since they are only slightly delayed, causing effects almost indistingu