Vehicle-mounted communication device and communication method
First Claim
1. A vehicle-mounted communication device loaded into a vehicle, comprising:
- a communication device which transmits information;
a position estimation information acquisition circuit including a GPS receiver, which receives a GPS signal transmitted from a GPS satellite via a GPS antenna, and a vehicle speed sensor, and the position estimation information acquisition circuit which periodically acquires a plurality of types of position estimation information capable of estimating a position of the vehicle including vehicle position information representing a position of the vehicle, and vehicle speed information representing a speed of the vehicle based on information received by the GPS receiver and a detection result of the vehicle speed sensor;
a memory which stores the plurality of types of position estimation information acquired by the position estimation information acquisition circuit with acquisition time information representing an acquisition time at which each of the position estimation information is acquired associated with the position estimation information; and
a control circuit including a CPU which causes the communication device to transmit information including the at least plurality of types of position estimation information,wherein a timing at which the position estimation information acquisition circuit acquires the vehicle position information and a timing at which the position estimation information acquisition circuit acquires the vehicle speed information are not synchronized with each other,wherein among the plurality of types of position estimation information transmitted from the communication device controlled by the control circuit,the at least one type of position estimation information is the position estimation information with which the acquisition time information representing the latest acquisition time is associated among the one type of position estimation information, and the other type of the position estimation information different from the one type of the position estimation information is the position estimation information with which the acquisition time information representing the acquisition time closest to the acquisition time at which the one type of position estimation information is acquired is associated,wherein the control circuit selects a combination of the vehicle position information and the vehicle speed information respectively acquired at acquisition times which are inhibited from shifting from each other, and the combination of the vehicle position information and the vehicle speed information is transmitted as the position estimation information by the communication device.
1 Assignment
0 Petitions
Accused Products
Abstract
An object is to enable a receiving side to estimate a position of a vehicle on a transmission side to be estimated with high accuracy. A vehicle-mounted communication device 1 loaded into a vehicle includes a vehicle-to-vehicle communication unit 15, a position estimation information acquisition unit 14 which periodically acquires a plurality of types of position estimation information, a storage unit 11 which stores the plurality of types of position estimation information with acquisition time information representing an acquisition time at which each of the position estimation information has been acquired associated with the position estimation information, and a control unit 10 which causes the vehicle-to-vehicle communication unit 15 to transmit vehicle information, in which among the transmitted plurality of types of position estimation information, the at least one type of position estimation information is the position estimation information with which the acquisition time information representing the latest acquisition time is associated among the one type of position estimation information, and the other type of position estimation information different from the one type of position estimation information is the position estimation information with which the acquisition time information representing the acquisition time closest to the acquisition time at which the one type of position estimation information has been acquired is associated.
3 Citations
6 Claims
-
1. A vehicle-mounted communication device loaded into a vehicle, comprising:
-
a communication device which transmits information; a position estimation information acquisition circuit including a GPS receiver, which receives a GPS signal transmitted from a GPS satellite via a GPS antenna, and a vehicle speed sensor, and the position estimation information acquisition circuit which periodically acquires a plurality of types of position estimation information capable of estimating a position of the vehicle including vehicle position information representing a position of the vehicle, and vehicle speed information representing a speed of the vehicle based on information received by the GPS receiver and a detection result of the vehicle speed sensor; a memory which stores the plurality of types of position estimation information acquired by the position estimation information acquisition circuit with acquisition time information representing an acquisition time at which each of the position estimation information is acquired associated with the position estimation information; and a control circuit including a CPU which causes the communication device to transmit information including the at least plurality of types of position estimation information, wherein a timing at which the position estimation information acquisition circuit acquires the vehicle position information and a timing at which the position estimation information acquisition circuit acquires the vehicle speed information are not synchronized with each other, wherein among the plurality of types of position estimation information transmitted from the communication device controlled by the control circuit, the at least one type of position estimation information is the position estimation information with which the acquisition time information representing the latest acquisition time is associated among the one type of position estimation information, and the other type of the position estimation information different from the one type of the position estimation information is the position estimation information with which the acquisition time information representing the acquisition time closest to the acquisition time at which the one type of position estimation information is acquired is associated, wherein the control circuit selects a combination of the vehicle position information and the vehicle speed information respectively acquired at acquisition times which are inhibited from shifting from each other, and the combination of the vehicle position information and the vehicle speed information is transmitted as the position estimation information by the communication device. - View Dependent Claims (2, 3, 4, 6)
-
-
5. A communication method comprising the steps of:
-
receiving a GPS signal transmitted from a GPS satellite via a GPS antenna in a GPS receiver; detecting a speed of a vehicle by a vehicle speed sensor; periodically acquiring a plurality of types of position estimation information including vehicle position information representing a position of a vehicle and vehicle speed information representing a speed of the vehicle, capable of estimating a position of a vehicle by a position estimation information acquisition circuit; acquiring the vehicle position information and the vehicle speed information at timings which are not synchronized with each other; storing the acquired plurality of types of position estimation information with acquisition time information representing an acquisition time at which each of the position estimation information is acquired associated with the position estimation information in a memory; and transmitting information including the plurality of types of position estimation information, among which the at least one type of position estimation information is the position estimation information with which the acquisition time information representing the latest acquisition time is associated among the one type of position estimation information and the other type of position estimation information different from the one type of position estimation information is the position estimation information with which the acquisition time information representing the acquisition time closest to the acquisition time at which the one type of position estimation information is acquired is associated, wherein the step of transmitting includes selecting a combination of the vehicle position information and the vehicle speed information respectively acquired at acquisition times which are inhibited from shifting from each other, and transmitting the combination of the vehicle position information and the vehicle speed information as the position estimation information by the communication device.
-
Specification