Method for determining the location of a GPS receiver using an estimated reference time
First Claim
1. A method for determining the location of a satellite receiver comprising the steps of:
- calculating satellite auxiliary information based on a known location other than a current unknown location of the satellite receiver;
transmitting that calculated auxiliary information to the satellite receiver at the unknown location; and
determining by the satellite receiver of its location by performing the following steps;
(a) selecting using the auxiliary information for the known location a trial time for use in calculating a presumed location using at least four satellites;
(b) calculating the presumed location of the satellite receiver based on the selected trial time;
(c) calculating a first range from the presumed location to a fifth satellite;
(d) measuring a second range from the presumed location to the fifth satellite;
(e) comparing the first range to the second range;
(f) acknowledging the presumed location as the actual current location of the satellite receiver if the first range is substantially equal to the second range;
otherwise performing the steps of;
(g) selecting a new trial time using the auxiliary information for the known location; and
(h) repeating the process beginning with step (b).
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Accused Products
Abstract
A method for determining the location of a satellite receiver. The method begins by selecting a trial time for use in calculating a presumed location of the receiver using at least four satellites. The presumed location is calculated based on the selected trial time. A first range from the presumed location to a fifth satellite is calculated and a second range from the presumed location to the fifth satellite is measured. A comparison is then made between the first range to the second range. If the first range is unequal to the second range the presumed location is not the actual location. A new trial time is selected and the method is repeated. When the first range and the second range are substantially the same then the presumed location is the actual location.
66 Citations
13 Claims
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1. A method for determining the location of a satellite receiver comprising the steps of:
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calculating satellite auxiliary information based on a known location other than a current unknown location of the satellite receiver; transmitting that calculated auxiliary information to the satellite receiver at the unknown location; and determining by the satellite receiver of its location by performing the following steps; (a) selecting using the auxiliary information for the known location a trial time for use in calculating a presumed location using at least four satellites; (b) calculating the presumed location of the satellite receiver based on the selected trial time; (c) calculating a first range from the presumed location to a fifth satellite; (d) measuring a second range from the presumed location to the fifth satellite; (e) comparing the first range to the second range; (f) acknowledging the presumed location as the actual current location of the satellite receiver if the first range is substantially equal to the second range;
otherwise performing the steps of;(g) selecting a new trial time using the auxiliary information for the known location; and (h) repeating the process beginning with step (b). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method, comprising the steps of:
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calculating satellite auxiliary information based on a known location other than a current unknown location of a satellite receiver; transmitting that calculated auxiliary information to the satellite receiver at the unknown location; utilizing of the auxiliary information by the satellite receiver to determine a trial time for use in calculating a presumed location of the satellite receiver with reference to a group of satellites; and verifying of the presumed location with reference to a satellite other than one of the group of satellites to determine an actual location of the satellite receiver. - View Dependent Claims (10, 11, 12)
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13. A system, comprising:
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a device at a known location operable to calculate satellite auxiliary information based on that known location; a cellular telephone network for communicating that auxiliary information to a cellular mobile station at an unknown location other than the known location of the device; and a satellite receiver associated with the cellular mobile station operable to process the auxiliary information to determine a trial time for use in calculating a presumed location of the satellite receiver and cellular mobile station with reference to a group of satellites, and verify the presumed location with reference to a satellite other than one of the group of satellites to determine an actual location of the satellite receiver and cellular mobile station.
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Specification