NAVIGATION SYSTEM AND ON-VEHICLE DEVICE
First Claim
1. A navigation system that provides location information about a vehicle using an on-vehicle device and a portable terminal device, the navigation system comprising:
- a first calculating unit configured to calculate a driven distance in a predetermined section based on vehicle speed calculated using a vehicle speed pulse outputted from a vehicle and a vehicle speed calculation coefficient;
a second calculating unit configured to calculate a driven distance by the vehicle in the predetermined section based on location information provided from a global navigation satellite;
a correcting unit configured to correct the vehicle speed calculation coefficient based on a result of comparing the driven distance calculated by the first calculating unit with the driven distance calculated by the second calculating unit; and
a predicting unit configured to predict a vehicle location based on the vehicle speed calculated using the vehicle speed pulse and the vehicle speed calculation coefficient corrected by the correcting unit.
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Accused Products
Abstract
A navigation system is configured in which a driven distance calculating unit of an on-vehicle device calculates a first driven distance in a predetermined section based on vehicle speed calculated using vehicle speed pulses outputted from a vehicle and a vehicle speed calculation coefficient, a driven distance calculating unit of a portable terminal device calculates a second driven distance of the vehicle in the predetermined section based on GPS information provided from global navigation satellites, a learning unit corrects the vehicle speed calculation coefficient based on the result of comparing the first driven distance with the second driven distance, and a vehicle location predicting unit of the portable terminal device predicts a vehicle location based on the vehicle speed calculated using the vehicle speed pulses and the corrected vehicle speed calculation coefficient.
17 Citations
6 Claims
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1. A navigation system that provides location information about a vehicle using an on-vehicle device and a portable terminal device, the navigation system comprising:
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a first calculating unit configured to calculate a driven distance in a predetermined section based on vehicle speed calculated using a vehicle speed pulse outputted from a vehicle and a vehicle speed calculation coefficient; a second calculating unit configured to calculate a driven distance by the vehicle in the predetermined section based on location information provided from a global navigation satellite; a correcting unit configured to correct the vehicle speed calculation coefficient based on a result of comparing the driven distance calculated by the first calculating unit with the driven distance calculated by the second calculating unit; and a predicting unit configured to predict a vehicle location based on the vehicle speed calculated using the vehicle speed pulse and the vehicle speed calculation coefficient corrected by the correcting unit. - View Dependent Claims (2, 3, 4, 5)
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6. An on-vehicle device that provides location information about a vehicle in linking with a portable terminal device, the on-vehicle device comprising:
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a calculating unit configured to calculate a driven distance in a predetermined section based on vehicle speed calculated using a vehicle speed pulse outputted from a vehicle and a vehicle speed calculation coefficient; a correcting unit configured to correct the vehicle speed calculation coefficient based on a result of comparing the driven distance calculated by the calculating unit with a driven distance by the vehicle in the predetermined section calculated by the portable terminal device based on location information provided from a global navigation satellite; and a sending unit configured to send the vehicle speed calculation coefficient corrected by the correcting unit to the portable terminal device.
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Specification