Enhanced dead reckoning method
First Claim
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1. A method for determining the position of a first vehicle, comprising the steps of:
- estimating a position of the first vehicle according to a dead reckoning method;
receiving a data packet from an apparatus via a WiFi radio communication link, wherein the position of the apparatus is known;
deriving a signal to noise ratio for the packet received at the first vehicle position and calculating a proximity of the first vehicle location to the apparatus location based on the magnitude of the signal to noise ratio;
refining the first vehicle position estimate based on the calculated proximity.
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Abstract
An enhanced dead reckoning method determines the position of a participating vehicle. The participating vehicle is unable to receive signals from global positioning satellites. The position is calculated by way of observed time difference calculations and received signal strength indications. The position is also calculated by communicating with other participating vehicles or egress points.
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9 Claims
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1. A method for determining the position of a first vehicle, comprising the steps of:
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estimating a position of the first vehicle according to a dead reckoning method; receiving a data packet from an apparatus via a WiFi radio communication link, wherein the position of the apparatus is known; deriving a signal to noise ratio for the packet received at the first vehicle position and calculating a proximity of the first vehicle location to the apparatus location based on the magnitude of the signal to noise ratio; refining the first vehicle position estimate based on the calculated proximity. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification