METHOD AND SYSTEM FOR NAVIGATION USING GPS VELOCITY VECTOR
First Claim
1. A vehicle navigation device includes a computer platform comprising:
- a global positioning system (GPS) receiver operable to acquire and track a GPS signal;
a processor assembly; and
a memory, wherein the memory includes;
last recorded GPS information comprising at least one of Ephemeris information and Almanac information; and
a GPS velocity vector determination module operable to output a velocity vector in the absence of current Ephemeris based upon the tracked GPS signal and the last recorded GPS information.
3 Assignments
0 Petitions
Accused Products
Abstract
A navigation device includes a computer platform that includes a global positioning system (GPS) receiver operable to acquire and track a GPS signal, a processor assembly, and a memory. The memory includes at least one of last recorded Ephemeris and Almanac information, and a GPS velocity vector determination module operable to generate a velocity vector output in the absence of current Ephemeris based upon the tracked GPS signal and the last recorded GPS information. A method of vehicle navigation in the absence of current Ephemeris includes acquiring and tracking a GPS signal, retrieving from a memory a last recorded location of a vehicle, setting a dead reckoning startup location equal to the last recorded location, retrieving from a memory at least one of a last recorded Ephemeris and Almanac, determining a current velocity vector and determining a current location based upon the velocity vector and the dead reckoning startup location.
128 Citations
12 Claims
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1. A vehicle navigation device includes a computer platform comprising:
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a global positioning system (GPS) receiver operable to acquire and track a GPS signal; a processor assembly; and a memory, wherein the memory includes; last recorded GPS information comprising at least one of Ephemeris information and Almanac information; and a GPS velocity vector determination module operable to output a velocity vector in the absence of current Ephemeris based upon the tracked GPS signal and the last recorded GPS information. - View Dependent Claims (2, 3)
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4. A method of vehicle navigation in the absence of current Ephemeris, the method comprising a navigation device performing the steps of:
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acquiring and tracking a GPS signal; retrieving from a memory a last recorded location of a vehicle; setting a dead reckoning startup location equal to the last recorded location; retrieving from a memory at least one of a last recorded Ephemeris and almanac; determining a current velocity vector based upon the GPS signal and the last recorded Ephemeris or almanac; and determining a current position based upon the velocity vector and the dead reckoning startup location. - View Dependent Claims (5, 6, 7, 8, 9)
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10. At least one processor configured to perform the actions of:
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acquiring and tracking a GPS signal; retrieving from a memory a last recorded location of a vehicle; setting a dead reckoning startup location equal to the last recorded location; retrieving from a memory one of a last recorded Ephemeris and Almanac; determining a current velocity vector based upon the GPS signal and the last recorded Ephemeris or Almanac; and determining a current location using the velocity vector and the dead reckoning startup location.
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11. A machine-readable medium comprising executable instructions stored thereon, comprising:
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a first set of instructions for acquiring and tracking a GPS signal; a second set of instructions for retrieving from a memory a last recorded location of a vehicle; a third set of instructions for setting a dead reckoning startup location equal to the last recorded location; a fourth set of instructions for retrieving from a memory one of a last recorded Ephemeris and Almanac; and a fifth set of instructions for determining a current velocity vector based upon the GPS signal and the last recorded Ephemeris or Almanac; and a sixth set of instructions for determining a current location using dead reckoning, based upon the velocity vector and the dead reckoning startup location.
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12. A method of vehicle navigation in the absence of current Ephemeris, comprising:
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continuously receiving GPS signals from tracked satellites; switching to a dead reckoning mode when the last recorded Ephemeris becomes unusable, wherein switching to a dead reckoning mode includes; setting a dead reckoning startup location equal to a last calculated GPS location; retrieving from a memory one of a last recorded Ephemeris and Almanac; determining a current velocity vector based upon the GPS signal and the last recorded Ephemeris or Almanac; and determining a current location based upon the velocity vector and the dead reckoning startup location.
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Specification