Vehicle position detection device and program
First Claim
1. A vehicle position detection device, comprising:
- a vehicle information acquisition part configured to acquire vehicle information on a state of an own vehicle;
a current position of the own vehicle is determined using a GPS device;
a conditional probability information storage part configured to store conditional probability information associating each of values to be taken in the vehicle information, a matching conditional probability that the each of the values occurs in a matching state where a position of the vehicle is map-matched to a link, and a free conditional probability that the each of the values occurs in a free state where the position of the vehicle is not map-matched to a link with one another;
a probability index calculation part configured to acquire, using the conditional probability information, the matching conditional probability and the free conditional probability corresponding to a value of the vehicle information acquired by the vehicle information acquisition part, to calculate a probability index in the matching state based on the acquired matching conditional probability, and to calculate a probability index in the free state based on the acquired free conditional probability; and
a state determination part configured to determine whether the free state or the matching state is to be selected based on the probability index in the matching state and the probability index in the free state calculated by the probability index calculation part, whereinwhen the free state is determined, a position calculated as a current position of the own vehicle is output to a display device, andwhen the matching state is determined a map matching position of the own vehicle is output as a current position of the own vehicle to the display device.
1 Assignment
0 Petitions
Accused Products
Abstract
Free state determination at a high precision is made by using a simpler mechanism. A vehicle position detection device is configured to: store conditional probability information which associates each of values to be taken in vehicle information on a state of an own vehicle, a matching conditional probability that the value occurs in a matching state, and a free conditional probability that the value occurs in a free state; use the conditional probability information to acquire the matching conditional probability and the free conditional probability corresponding to the acquired value of the vehicle information; calculate a probability index in the matching state and a probability index in the free state based on the conditional probabilities; and determine which state is to be selected based on the probability index in the matching state and the probability index in the free state.
9 Citations
17 Claims
-
1. A vehicle position detection device, comprising:
-
a vehicle information acquisition part configured to acquire vehicle information on a state of an own vehicle;
a current position of the own vehicle is determined using a GPS device;a conditional probability information storage part configured to store conditional probability information associating each of values to be taken in the vehicle information, a matching conditional probability that the each of the values occurs in a matching state where a position of the vehicle is map-matched to a link, and a free conditional probability that the each of the values occurs in a free state where the position of the vehicle is not map-matched to a link with one another; a probability index calculation part configured to acquire, using the conditional probability information, the matching conditional probability and the free conditional probability corresponding to a value of the vehicle information acquired by the vehicle information acquisition part, to calculate a probability index in the matching state based on the acquired matching conditional probability, and to calculate a probability index in the free state based on the acquired free conditional probability; and a state determination part configured to determine whether the free state or the matching state is to be selected based on the probability index in the matching state and the probability index in the free state calculated by the probability index calculation part, wherein when the free state is determined, a position calculated as a current position of the own vehicle is output to a display device, and when the matching state is determined a map matching position of the own vehicle is output as a current position of the own vehicle to the display device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
-
9. A non-transitory computer-readable storage medium storing program for a vehicle position detection device, which when executed causes a processor to:
-
acquire vehicle information on a state of an own vehicle;
determine the current position of the own vehicle using a GPS device;store conditional probability information associating each of values to be taken in the vehicle information, a matching conditional probability that the each of the values occurs in a matching state where a position of the vehicle is map-matched to a link, and a free conditional probability that the each of the values occurs in a free state where the position of the vehicle is not map-matched to a link with one another; a acquire, using the conditional probability information, the matching conditional probability and the free conditional probability corresponding to a value of the vehicle information acquired, to calculate a probability index in the matching state based on the acquired matching conditional probability, and to calculate a probability index in the free state based on the acquired free conditional probability; and determine whether the free state or the matching state is to be selected based on the probability index in the matching state and the probability index in the free state calculated by the probability index calculation part, wherein when the free state is determined, the processor outputs to a display device a position calculated as a current position of the own vehicle, and when the matching state is determined, the processor outputs to the display device a map matching position of the own vehicle as a current position of the own vehicle.
-
-
10. A vehicle position detection device, comprising:
-
a processor configured to acquire vehicle information on a state of an own vehicle, wherein the processor is also configured to determine the current position of the own vehicle using a GPS device; store conditional probability information associating each of values to be taken in the vehicle information, a matching conditional probability that the each of the values occurs in a matching state where a position of the vehicle is map-matched to a link, and a free conditional probability that the each of the values occurs in a free state where the position of the vehicle is not map-matched to a link with one another; acquire, using the conditional probability information, the matching conditional probability and the free conditional probability corresponding to a value of the vehicle information, to calculate a probability index in the matching state based on the acquired matching conditional probability, and to calculate a probability index in the free state based on the acquired free conditional probability; and determine whether the free state or the matching state is to be selected based on the probability index in the matching state and the probability index in the free state, when the free state is determined, the processor outputs to a display device a position calculated as a current position of the own vehicle, and when the matching state is determined, the processor outputs to the display device a map matching position of the own vehicle as a current position of the own vehicle. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
-
Specification