Patent ID: 7733268
Filing Date: 2010-06-08
Classification: G01S

Abstract:
1. A method for determining the location of a device comprising the steps of: (a) receiving a first plurality of signals comprising one signal from each of a first plurality of satellites; (b) determining a first location of the device as a function of the first plurality of signals; (c) determining a second location of the device as a function of a second plurality of signals if the first location is not within a predetermined threshold; and, (d) determining a third location of the device as a function of a third plurality of signals if the second location is not within the predetermined threshold, wherein the second plurality of signals is a first subset of the first plurality of signals, wherein the third plurality of signals is a second subset of the first plurality of signals and wherein a cardinality of the second plurality of signals is the same or greater than a cardinality of the third plurality of signals.