Ship reverse-run detection system, ship reverse-run detection method, and recording medium storing ship reverse-run detection program

Patent metadata

Field	Value
Publication number	US-11027814-B2
Application number	US-201816054297-A
Country	US
Kind code	B2
Filing date	Aug 3, 2018
Priority date	Feb 10, 2016
Publication date	Jun 8, 2021
Grant date	Jun 8, 2021

Abstract

A ship reverse-run detection system includes a memory, and a processor coupled to the memory, wherein the processor is configured to: detect a direction of change in a position of a ship based on position information of the ship which is detected by a position detection device which is mounted on the ship, specify a traveling direction associated with a navigation region of the ship which is specified based on the position information, by referring to a storage which stores the navigation region and the traveling direction in association with each other, and detect reverse run of the ship in the navigation region based on the magnitude of an angle between the direction of the change and the traveling direction.

First claim

What is claimed is:

1. A ship reverse-run detection system comprising:
a memory; and
a processor coupled to the memory, wherein the processor is configured to:
acquire course data including a navigation region of a ship from a terminal device;
acquire first position information of the ship at a first time which is detected by a position detection device which is mounted on the ship;
detect, based on the first position information, whether a first position of the ship is within the navigation region;
specify a traveling direction associated with the navigation region by referring to a storage which stores the navigation region and the traveling direction in association with each other when the first position of the ship is within the navigation region;
set, as a reverse-run identification range, a region which is provided in an opposite direction to the traveling direction and is specified by two border lines which are specified by two symmetric angles with respect to a line which extends in a direction opposite to the traveling direction and extend from a second position of the ship indicated by second position information which is acquired at a second time which is before the first time;
determine whether the first position is within the reverse-run identification range;
extract movement components in the direction of respective pairs of two positions of the ship which are acquired in a predetermined past period including the second time when determining that the first position is within the reverse-run identification range;
determine whether a value which is obtained by tallying the movement components is equal to or larger than a threshold;
detect reverse run of the ship in the navigation region when determining that the value is equal to larger than the threshold; and
output an alert indicating the reverse run of the ship when detecting the reverse run of the ship.

2. The ship reverse-run detection system according to claim 1 , wherein the processor transmits, when the reverse run of the ship is detected, information indicating an occurrence of the reverse run and information of an identification of the ship regarding the reverse run to a specific destination as the alert.

3. The ship reverse-run detection system according to claim 1 , wherein the processor detects the reverse run of the ship in the navigation region when the magnitude of an angle between a change direction of the ship and the traveling direction is within a specific range and a continuous migration length of the ship in the reverse-run identification range is a specific length or more.

4. The ship reverse-run detection system according to claim 3 , wherein the specific length is 30 meters or more.

5. The ship reverse-run detection system according to claim 1 , wherein the processor detects the reverse run of the ship in the navigation region when the magnitude of an angle between a change direction of the ship and the traveling direction is equal to or larger than a specific angle exceeding 90°.

6. The ship reverse-run detection system according to claim 1 , wherein the processor detects the reverse run of the ship in the navigation region when the magnitude of an angle between a change direction of the ship and the traveling direction exceeds 160° or 165°.

7. A ship reverse-run detection method comprising:
acquiring, by a computer, course data including a navigation region of a ship from a terminal device;
acquiring first position information of the ship at a first time which is detected by a position detection device which is mounted on the ship;
detecting, based on the first position information, whether a first position of the ship is within the navigation region;
specifying a traveling direction associated with the navigation region, by referring to a storage which stores the navigation region and the traveling direction in association with each other when the first position of the ship is within the navigation region;
setting, as a reverse-run identification range, a region which is provided in an opposite direction to the traveling direction and is specified by two border lines which are specified by two symmetric angles with respect to a line which extends in a direction opposite to the traveling direction and extend from a second position of the ship indicated by second position information which is acquired at a second time which is before the first time;
determining whether the first position is within the reverse-run identification range;
extracting movement components in the direction of respective pairs of two positions of the ship which are acquired in a predetermined past period including the second time when determining that the first position is within the reverse-run identification range;
determining whether a value which is obtained by tallying the movement components is equal to or larger than a threshold;
detecting reverse run of the ship in the navigation region when determining that the value is equal to larger than the threshold; and
outputting an alert indicating the reverse run of the ship when detecting the reverse run of the ship.

8. The ship reverse-run detection method according to claim 7 , further comprising:
transmitting, when the reverse run of the ship is detected, information indicating an occurrence of the reverse run and information of an identification of the ship regarding the reverse run to a specific destination as the alert.

9. The ship reverse-run detection method according to claim 7 , wherein the reverse run of the ship is detected in the navigation region when the magnitude of an angle between a change direction of the ship and the traveling direction is within a specific range and a continuous migration length of the ship in the reverse-run identification range is a specific length or more.

10. The ship reverse-run detection method according to claim 9 , wherein the specific length is 30 meters or more.

11. The ship reverse-run detection method according to claim 7 , wherein the reverse run of the ship is detected in the navigation region when the magnitude of an angle between a change direction of the ship and the traveling direction is equal to or larger than a specific angle exceeding 90°.

12. The ship reverse-run detection system according to claim 7 , wherein the reverse run of the ship is detected in the navigation region when the magnitude of an angle between a change direction of the ship and the traveling direction exceeds 160° or 165°.

13. A non-transitory computer-readable recording medium storing a ship reverse-run detection program which causes a computer to execute a process, the process comprising:
acquiring, by a computer, course data including a navigation region of a ship from a terminal device;
acquiring first position information of the ship which is detected at a first time by a position detection device which is mounted on the ship;
specifying a traveling direction associated with the navigation region, by referring to a storage which stores the navigation region and the traveling direction in association with each other when the first position of the ship is within the navigation region;
setting, as a reverse-run identification range, a region which is provided in an opposite direction to the traveling direction and is specified by two border lines which are specified by two symmetric angles with respect to a line which extends in a direction opposite to the traveling direction and extend from a second position of the ship indicated by second position information which is acquired at a second time which is before the first time;
determining whether the first position is within the reverse-

Assignees

• Fujitsu Ltd

Inventors

• Adachi Takayuki

Classifications

• B63H25/00 Primary

  Steering; Slowing-down otherwise than by use of propulsive elements (using movably-installed outboard propulsion units B63H20/00); Dynamic anchoring, i.e. positioning vessels by means of main or auxiliary propulsive elements · CPC title

• B63B49/00

  Arrangements of nautical instruments or navigational aids (nautical measuring instruments G01C; radio navigation, analogous arrangements using other waves G01S) · CPC title

• G08G3/00 Primary

  Traffic control systems for marine craft (marking of navigational route B63B22/16, B63B51/00) · CPC title

• B63H2025/045

  making use of satellite radio beacon positioning systems, e.g. the Global Positioning System [GPS] · CPC title