JP2010038798A5

JP2010038798A5 -

Info

Publication number: JP2010038798A5
Application number: JP2008203683A
Authority: JP
Filing date: 2008-08-07
Publication date: 2011-09-15

Claims

Receiving means for receiving positioning signals and navigation messages transmitted from GPS satellites;
Storage means for storing the navigation message received by the receiving means;
Positioning means for calculating the current position from the positioning signal received by the receiving means and the navigation message stored in the storage means;
In a GPS receiver having
Determining means for detecting the movement state of the device body of the GPS receiver and determining whether the device body is in a moving state or a stationary state;
When the determining means determines that the apparatus main body has shifted from the moving state to the stationary state, the power to the receiving means and the positioning means is turned off , and it is determined that the apparatus main body has shifted from the stationary state to the moving state. A power control means for turning on all or a part of the power of the receiving means and the positioning means,
Navigation message acquisition means capable of acquiring a navigation message from outside without going through the receiving means;
When it is determined by the determination means that the device main body has shifted from a stationary state to a movement state, a navigation message is acquired via the navigation message acquisition means, and the acquired navigation message is stored in the storage means A navigation message updating means for updating the navigation message;
A GPS receiver characterized by comprising:

The discrimination means includes
An acceleration sensor for detecting an acceleration applied to the device body;
A calculation means for calculating the speed of the apparatus main body based on a detection value of the acceleration sensor;
State determining means for determining whether the apparatus main body is in a moving state or a stationary state based on a detection value of the acceleration sensor and a speed value calculated by the calculating means;
The GPS receiver according to claim 1, comprising:

The navigation message acquisition means includes:
A communication means for communicating with an external device in which new navigation messages are sequentially stored;
A communication control means for transmitting a transfer request for a new navigation message to the external device via the communication means, and receiving a navigation message transmitted from the external device based on the transfer request;
The GPS receiver according to claim 1, further comprising:

The communication means includes
It is configured to connect to the Internet via a wireless LAN,
The communication control means includes
4. The GPS receiving apparatus according to claim 3, wherein a navigation message is acquired from the outside by the communication means via the Internet.

The communication control means includes
The configuration is such that, when the navigation message transfer request is made, information on a current position previously determined by the positioning means is transmitted, and a navigation message corresponding to the information on the current position is received. 3. The GPS receiver according to 3.

The navigation message update means includes:
When it is determined by the determining means that the apparatus main body has shifted from the stationary state to the moving state, it has a time limit determining means for determining whether or not the expiration date of the navigation message stored in the storage means has passed. ,
When the expiration date determining means determines that the expiration date has passed, the navigation message acquisition means acquires the navigation message and updates the navigation message stored in the storage means. The GPS receiver according to claim 1.

Having a battery mounting section,
2. The GPS receiver according to claim 1, wherein the receiving unit and the positioning unit are driven by a power source of a battery mounted on the battery mounting unit.

A GPS receiving system comprising the GPS receiving device according to claim 1 and a server device connected to a network.
The server device
Storage means for storing new navigation messages sequentially;
A communication means for communicating via a communication network;
Communication control means for transmitting a navigation message stored in the storage means in response to a transfer request from the GPS receiving device via the communication network;
With
The navigation message acquisition means in the GPS receiver is
Communication means for communicating via the communication network;
Communication control means for connecting to the server device via the communication network by the communication means, requesting the server device to transfer a new navigation message, and receiving the navigation message from the server device;
A GPS positioning system characterized by comprising:

The communication control means in the GPS receiver is
When the transfer request for the new navigation message is requested, information on the current position previously measured by the positioning means is transmitted.
The communication control means of the server device includes:
9. A configuration in which when a current position information is received from the GPS receiver, a new navigation message corresponding to the current position is read from the storage means and transmitted to the GPS receiver. GPS positioning system.