GNSS correction data distribution device, GNSS correction data distribution system, and GNSS correction data distribution method
View Patent ↗GPS (Global Positioning System) correction data distribution device includes: first communicator that communicates with terminal device; second communicator that communicates with server; HDD (hard drive) that stores a database, the database having at least one coordinate and GPS correction data in association with each other; and manager that manages the database. Manager obtains GPS correction data from server with respect to the coordinate in the database, and updates the database while associating the coordinate with the GPS correction data. Manager refers to the database upon receipt of the GPS correction data distribution request from terminal device, extracts the GPS correction data of the coordinate corresponding to a position of the terminal device, and distributes the extracted GPS correction data to terminal device.
1. A GNSS (Global Navigation Satellite System) correction data distribution device configured to distribute GNSS correction data to a terminal device, the terminal device configured to perform real time kinematic positioning using a GNSS, the GNSS correction data distribution device comprising:
a first communicator configured to communicate with the terminal device;
a second communicator configured to communicate with a GNSS correction data server;
a storage configured to store GNSS correction data information, the GNSS correction data information having at least one predetermined coordinate and GNSS correction data in association with each other; and
a manager configured to manage the GNSS correction data information, wherein the manager is configured to:
obtain the GNSS correction data from the GNSS correction data server through the second communicator with respect to the predetermined coordinate in the GNSS correction data information, and update the GNSS correction data information while associating the predetermined coordinate with the GNSS correction data, and
refer to the GNSS correction data information upon receipt of a GNSS correction data distribution request from the terminal device through the first communicator, extract the GNSS correction data of the predetermined coordinate corresponding to a position of the terminal device, and distribute the extracted GNSS correction data to the terminal device.
2. The GNSS correction data distribution device according to claim 1 , wherein, upon receipt of the GNSS correction data distribution request, the manager refers to the GNSS correction data information, extracts the GNSS correction data of the coordinate closest to the position of the terminal device, and distributes the extracted GNSS correction data to the terminal device.
3. The GNSS correction data distribution device according to claim 1 , wherein
assuming that one session is a period from start to end of connection between the GNSS correction data distribution device and the terminal device, and
the manager refers to the GNSS correction data information upon receipt of the GNSS correction data distribution request, extracts the GNSS correction data distributed in a preceding session when a distance between the position of the terminal device and each of a plurality of coordinates in the GNSS correction data information falls within a predetermined range, and distributes the extracted GNSS correction data to the terminal device.
4. The GNSS correction data distribution device according to claim 1 , wherein assuming that one session is a period from start to end of connection
between the GNSS correction data distribution device and the terminal device, the manager refers to the GNSS correction data information upon receipt of the GNSS correction data distribution request, extracts the GNSS correction data based on the position of the terminal device in a preceding session when a distance between the position of the terminal device and each of a plurality of coordinates in the GNSS correction data information falls within a predetermined range, and distributes the extracted GNSS correction data to the terminal device.
5. The GNSS correction data distribution device according to claim 1 , wherein the manager refers to the GNSS correction data information upon receipt of the GNSS correction data distribution request, extracts the GNSS correction data based on a movement direction of the terminal device when a distance between the position of the terminal device and each of a plurality of coordinates in the GNSS correction data information falls within a predetermined range, and distributes the extracted GNSS correction data to the terminal device.
6. The GNSS correction data distribution device according to claim 1 , wherein, upon receipt of the GNSS correction data distribution request, the manager obtains the GNSS correction data from the GNSS correction data server through the second communicator with respect to a coordinate indicating the position of the terminal device, and updates the GNSS correction data information while associating the coordinate with the GNSS correction data.
7. The GNSS correction data distribution device according to claim 6 , wherein the manager decreases a number of coordinates managed in the GNSS correction data information when a predetermined condition is satisfied.
8. The GNSS correction data distribution device according to claim 7 , wherein, when the manager deletes a coordinate in the GNSS correction data information, the coordinate to be deleted is
(i) a coordinate which is outside a predetermined area whose center is at a coordinate which is updated oldest in the GNSS correction data information,
(ii) a coordinate which is outside a predetermined area whose center is at a coordinate which is updated latest in the GNSS correction data information, or
(iii) a coordinate which is outside a predetermined area whose center is at centroid of the coordinates in the GNSS correction data information.
9. The GNSS correction data distribution device according to claim 7 , wherein the manager deletes, in each terminal device, a coordinate other than
(i) a latest position in a past position of the terminal device or (ii) a coordinate at the centroid of coordinates related to the terminal device in a coordinate of the GNSS correction data, the coordinate of the GNSS correction data being distributed in the past to the terminal device in the GNSS correction data information.
10. A GNSS (Global Navigation Satellite System) correction data distribution system comprising:
a terminal device configured to perform real time kinematic positioning using a GNSS; and
the GNSS correction data distribution device according to claim 1 that is configured to distribute the GNSS correction data to the terminal device.