Mobile object monitoring system and mobile object monitoring method
A mobile object monitoring system including a terminal unit installed in a vehicle and a monitoring unit configured to monitor an unknown mobile object around the vehicle. The terminal unit includes: an information acquisition component that acquires unknown mobile object information including information on presence or absence of an unknown mobile object; a determination component that determines presence or absence of an unknown mobile object regarding a blind spot; a time-of-absence information generation component that generates a time-of-absence information set concerning an unknown mobile object that includes absence information of an unknown mobile object in the blind spot and time information on a time of determination; and a communication component that transmits the time-of-absence information set. The monitoring unit receives time-of-absence information sets from terminal units and establishes, regarding the received time-of-absence information sets, reliability of absence information based on the number of time-of-absence information sets with overlapping time ranges that are based on the time information on a time of determination.
1 . A mobile object monitoring method used in a mobile object monitoring system including: two or more first terminal units that are each installed in a corresponding first mobile object of a plurality of first mobile objects; and a single monitoring unit that is configured to collect information concerning an unknown mobile object around each of the plurality of first mobile objects and to monitor the unknown mobile object; and a second terminal unit that is installed in a second mobile object, the mobile object monitoring method comprising:
transmitting, by the monitoring unit, information on a blind spot of the second mobile object;
receiving, by each of the first terminal units, the information on the blind spot of the second mobile object;
setting, by each of the first terminal units, the received blind spot of the second mobile object as a predetermined monitored area;
acquiring, by each of the first terminal units using a sensor that is installed on a corresponding first mobile object and configured to detect information on surrounding environment around the corresponding first mobile object, unknown mobile object information, the unknown mobile object information including information on presence or absence of the unknown mobile object;
based on the acquired unknown mobile object information, determining, by each of the first terminal units, presence or absence of the unknown mobile object in the predetermined monitored area;
generating, by each of the first terminal units, a time-of-absence information set concerning the unknown mobile object in response to determining that the unknown mobile object is absent in the predetermined monitored area, the time-of-absence information set including absence information indicating the absence of the unknown mobile object in the predetermined monitored area and time information on a time of the determination;
transmitting, by each of the first terminal units, the time-of-absence information set that is generated;
receiving, by the monitoring unit, the time-of-absence information set transmitted from each of the first terminal units to form a collection of time-of-absence information sets;
based on the collection of time-of-absence information sets, determining, by the monitoring unit, whether the unknown mobile object regarding the predetermined monitored area is absent in a time range that is based on the time information, wherein
in determining whether the unknown mobile object regarding the predetermined monitored area is absent in a time range that is based on the time information, reliability of the absence information is established for the collection of time-of-absence information sets based on the number of time-of-absence information sets in a first group of time-of-absence information sets, the time-of-absence information sets in the first group having overlapping time ranges that are based on the time information.
2 . The mobile object monitoring method according to claim 1 , further comprising:
transmitting, by the monitoring unit, information regarding the unknown mobile object including the reliability of the absence information;
receiving, by the second terminal unit, the information regarding the unknown mobile object transmitted by the monitoring unit; and
performing, by the second terminal unit, driving support of the second mobile object based on the received information regarding the unknown mobile object.