POSITION CALCULATION METHOD AND POSITION CALCULATION SYSTEM
First Claim
1. A position calculation method implemented by a position calculation system that includes a position calculation device and a server, the position calculation device calculating its position by performing given positioning calculations based on navigation data that is positioning satellite orbit information, and the server providing navigation data to the position calculation device, the position calculation method comprising:
- causing the position calculation device to store navigation data at a given reference date as reference navigation data corresponding to the reference date, transmit the reference date to the server to request the server to transmit latest differential navigation data that indicates a difference between the navigation data at the reference date and latest navigation data, receive the latest differential navigation data from the server, and calculate its position by performing the given positioning calculations based on the latest differential navigation data received from the server and the reference navigation data; and
causing the server to successively acquire latest navigation data from a positioning satellite or an external system, store the acquired navigation data, generate the latest differential navigation data based on navigation data at the reference date transmitted from the position calculation device and the latest navigation data included in the stored navigation data, and transmit the generated latest differential navigation data to the position calculation device.
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Accused Products
Abstract
A position calculation method includes storing navigation data at a given reference date as reference navigation data corresponding to the reference date, transmitting the reference date to request a server that provides navigation data to transmit latest differential navigation data that indicates a difference between the navigation data at the reference date and latest navigation data, receiving the latest differential navigation data from the server, and calculating a position by performing given positioning calculations based on the latest differential navigation data received from the server and the reference navigation data.
20 Citations
7 Claims
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1. A position calculation method implemented by a position calculation system that includes a position calculation device and a server, the position calculation device calculating its position by performing given positioning calculations based on navigation data that is positioning satellite orbit information, and the server providing navigation data to the position calculation device, the position calculation method comprising:
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causing the position calculation device to store navigation data at a given reference date as reference navigation data corresponding to the reference date, transmit the reference date to the server to request the server to transmit latest differential navigation data that indicates a difference between the navigation data at the reference date and latest navigation data, receive the latest differential navigation data from the server, and calculate its position by performing the given positioning calculations based on the latest differential navigation data received from the server and the reference navigation data; and causing the server to successively acquire latest navigation data from a positioning satellite or an external system, store the acquired navigation data, generate the latest differential navigation data based on navigation data at the reference date transmitted from the position calculation device and the latest navigation data included in the stored navigation data, and transmit the generated latest differential navigation data to the position calculation device.
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2. A position calculation system comprising:
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a position calculation device that calculates its position by performing given positioning calculations based on navigation data that is positioning satellite orbit information; and a server that provides navigation data to the position calculation device, the position calculation device including; a storage section that stores navigation data at a given reference date as reference navigation data corresponding to the reference date; a differential navigation data request section that transmits the reference date to the server to request the server to transmit latest differential navigation data that indicates a difference between the navigation data at the reference date and latest navigation data; a reception section that receives the latest differential navigation data from the server; and a position calculation section that calculates the position of the position calculation device by performing the given positioning calculations based on the latest differential navigation data received from the server and the reference navigation data; and the server including; a navigation data acquisition section that successively acquires latest navigation data from a positioning satellite or an external system; a storage section that stores the acquired navigation data; a latest differential navigation data generation section that generates the latest differential navigation data based on navigation data at the reference date transmitted from the position calculation device and the latest navigation data included in the stored navigation data; and a transmission section that transmits the generated latest differential navigation data to the position calculation device.
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3. A position calculation method comprising:
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storing navigation data at a given reference date as reference navigation data corresponding to the reference date; transmitting the reference date to a server that provides navigation data to request the server to transmit latest differential navigation data that indicates a difference between the navigation data at the reference date and latest navigation data; receiving the latest differential navigation data from the server; and calculating a position by performing given positioning calculations based on the latest differential navigation data received from the server and the reference navigation data. - View Dependent Claims (4, 5, 6, 7)
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Specification