Correcting a prior dead reckoning determined position measurement using GPS when GPS is later acquired
First Claim
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1. A method of providing positional information to a receiver which is arranged to receive a positioning system signal, the signal providing information relating to the receiver'"'"'s current position, comprising the steps of:
- tracking the receiver'"'"'s route from a first position at which the positioning system signal is not available to a second position at which the positioning system signal is available;
determining positional information defining the first position from the positioning system signal at the second position and the receiver'"'"'s route between the first and second positions; and
storing the positional information at the receiver.
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Abstract
Dead reckoning is used to solve a location problem when a user is out of range of GPS coverage. A starting position is determined by tracking movements from a first position where GPS coverage is not available to a second position where GPS coverage is available. The starting position is then determined by backtracking from this known position.
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Citations
11 Claims
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1. A method of providing positional information to a receiver which is arranged to receive a positioning system signal, the signal providing information relating to the receiver'"'"'s current position, comprising the steps of:
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tracking the receiver'"'"'s route from a first position at which the positioning system signal is not available to a second position at which the positioning system signal is available;
determining positional information defining the first position from the positioning system signal at the second position and the receiver'"'"'s route between the first and second positions; and
storing the positional information at the receiver. - View Dependent Claims (2, 3, 4, 5)
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6. A device for providing positional information to a user, the device being arranged to receive a positioning system signal, the signal providing information relating to the current position of the device, comprising:
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means for tracking the route of the device from a first position at which the positioning system signal is not available to a second position at which the positioning system signal is available;
means for determining positional information defining the first position from the positioning system signal at the second position and the receiver'"'"'s route between the first and second positions; and
means for storing the positional information. - View Dependent Claims (7, 8, 9, 10)
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11. A device for providing positional information to a user, the device being arranged to receive a positioning system signal, the signal providing information relating to the current position of the device, comprising:
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trading apparatus for tracking the route of the device from a first position at which the positioning system signal is not available to a second position at which the positioning system signal is available;
a positioning device for determining positional information defining the first position from the positioning system signal at the second position and the receiver'"'"'s route between the first and second positions; and
a storage element for storing the positional information.
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Specification