Positioning system, terminal device, information provision device, terminal device's control method, and terminal device's control program

Abstract

The present invention provides a positioning system and the like which can reduce the burden on recording devices of terminal devices such as GPS receivers and the processing load of sending and receiving topographical information, and can perform high-precision positioning calculations using topographical information. The terminal device (50) includes: a rough positioning position information generating device, which generates a rough positioning position information obtained from the information providing device (20) to obtain a piece of segmented terrain information; a segmented terrain information requesting device, requests the information providing device (20) corresponding to the rough A piece of segmented topographical information representing a rough positioning position represented by the positioning position information; and a high-precision positioning position information generating device that generates high-precision positioning position information using altitude information included in the segmented terrain information. An information providing device (20) includes segmented terrain information selecting means and segmented terrain information sending means.

Description

technical field [0001] The present invention relates to a positioning system for positioning based on signals from position information satellites, a terminal device, an information providing device, a control method for the terminal device, and a control program for the terminal device. Background technique [0002] Conventionally, a positioning system for locating a current position using a satellite navigation system such as a GPS (Global Positioning System) receiver has been put into practical use. [0003] Furthermore, a technique has been proposed in which a GPS receiver holds a database including topographical information of various points on the earth's surface, and performs positioning using altitude information included in the topographical information (for example, Patent Document 1). [0004] When the GPS receiver acquires terrain information (hereinafter referred to as an altitude model) in advance, since the only unknown information is latitude, longitude, and ...

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Problems solved by technology

[0005] However, in order to maintain the altitude model covering the whole world, a large-capacity recording device (data storage: data memory) is required, so when the GPS receiver has only a small-capacity recording device, there is a problem that it is difficult to maintain the altitude model

[0006] In addition, even if the altitude model is held by an external device (for example, an external server), when the GPS receiver obtains the altitude model by downloading or the like as necessary, for example, when the data size of the altitude model to be downloaded is large, the process of sending and receiving the altitude model The burden is heavy, and there is also a problem that the cost of transmission and reception increases

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