Reduced-power GPS-based system for tracking multiple objects from a central location
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United States of America Patent
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May 12, 1998
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N/A
app pub date -
Aug 25, 1997
filing date -
May 31, 1995
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Abstract
Location of an object to be tracked is determined by measuring, at a receiver situated at the object, the propagation time differences between the signals from a plurality of GPS satellites, each of which is received by the receiver situated at the object. The measured propagation time difference values are transmitted to a central station where the location of the object to be tracked is calculated based upon the propagation time differences of the signals transmitted from the satellites and data derived from a receiver apart from the object but also receiving signals from the satellites.
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