Satellite radio wave sensitivity distribution management system and method for work vehicle

1. A satellite radio wave sensitivity distribution management system for a work vehicle that travels automatically in a work site by satellite navigation technology, the system comprising:

a satellite positioning module that outputs satellite position data and reception sensitivity based on satellite information from a satellite;

a sensitivity reduction event detection section that detects occurrence of a sensitivity reduction event comprising abnormal reduction of the reception sensitivity;

a sensitivity reduction event information generation section that generates sensitivity reduction event information including an occurrence location of the sensitivity reduction event, an occurrence time of the sensitivity reduction event, and satellite identification data that identifies the satellite as the subject of the sensitivity reduction event;

a sensitivity reduction event information storage section that stores the sensitivity reduction event information retrievably;

a reception obstacle determination section that determines a reception obstacle as the cause of the sensitivity reduction event, based on the sensitivity reduction event information; and

a sensitivity reduction management section that manages a sensitivity reduction area and a sensitivity reduction time zone in which occurrence of the sensitivity reduction event due to the reception obstacle is presumed.

2. The satellite radio wave sensitivity distribution management system of claim 1 , wherein there is provided a work site information generation section that generates work site information added with satellite radio wave sensitivity distribution, the work site information being comprised of the sensitivity reduction area and the sensitivity reduction time zone incorporated in a map of the work site.

3. The satellite radio wave sensitivity distribution management system of claim 1 , wherein there is provided a traveling route generation section that generates a traveling route for the work vehicle, the traveling route generation section being configured to generate the traveling route so as not to encounter the sensitivity reduction event, with consideration to the sensitivity reduction area and the sensitivity reduction time zone.

4. The satellite radio wave sensitivity distribution management system of claim 3 , wherein:

the traveling route is added with the sensitivity reduction area and the sensitivity reduction time zone; and

when possibility of the work vehicle entering the sensitivity reduction area in the sensitivity reduction time zone is confirmed, the work vehicle is caused to wait until exit from the sensitivity reduction time zone.

5. The satellite radio wave sensitivity distribution management system of claim 3 , wherein:

the traveling route is added with the sensitivity reduction area and the sensitivity reduction time zone; and

there is provided a traveling route changing section configured to change the traveling route to a route for moving into a location of better reception sensitivity, when possibility of the work vehicle entering the sensitivity reduction area in the sensitivity reduction time zone is confirmed.

6. The satellite radio wave sensitivity distribution management system of claim 1 , wherein:

the satellite positioning module, the sensitivity reduction event detection section and the sensitivity reduction event information generation section are provided in the work vehicle;

the sensitivity reduction event information storage section, the reception obstacle determination section and the sensitivity reduction management section are provided in a management computer remote from the work site; and

the sensitivity reduction event information is forwarded from the work vehicle to the management computer.

7. A satellite radio wave sensitivity distribution management method for a work vehicle that travels automatically in a work site by satellite navigation technology, the method comprising:

outputting satellite position data and reception sensitivity based on satellite information from a satellite;

detecting occurrence of a sensitivity reduction event comprising abnormal reduction of the reception sensitivity;

generating sensitivity reduction event information including an occurrence location of the sensitivity reduction event, an occurrence time of the sensitivity reduction event, and satellite identification data that identifies the satellite as the subject of the sensitivity reduction event;

storing the sensitivity reduction event information retrievably;

determining a reception obstacle as a cause of the sensitivity reduction event, based on the sensitivity reduction event information; and

managing a sensitivity reduction area and a sensitivity reduction time zone in which occurrence of the sensitivity reduction event due to the reception obstacle is presumed.

8. The satellite radio wave sensitivity distribution management method of claim 7 , further comprising generating work site information added with satellite radio wave sensitivity distribution, the work site information being comprised of the sensitivity reduction area and the sensitivity reduction time zone incorporated in a map of the work site.

9. The satellite radio wave sensitivity distribution management method of claim 7 , further comprising generating a traveling route for the work vehicle, the traveling route being generated so as not to encounter the sensitivity reduction event, with consideration to the sensitivity reduction area and the sensitivity reduction time zone.

10. The satellite radio wave sensitivity distribution management method of claim 9 , wherein:

the traveling route is added with the sensitivity reduction area and the sensitivity reduction time zone; and

when possibility of the work vehicle entering the sensitivity reduction area in the sensitivity reduction time zone is confirmed, the work vehicle is caused to wait until exit from the sensitivity reduction time zone.

11. The satellite radio wave sensitivity distribution management method of claim 9 , wherein:

the traveling route is added with the sensitivity reduction area and the sensitivity reduction time zone; and

the method further comprises changing the traveling route to a route for moving into a location of better reception sensitivity, when possibility of the work vehicle entering the sensitivity reduction area in the sensitivity reduction time zone is confirmed.