Navigation Device, Route-Search Server, and Route-Search System
First Claim
1. A navigation device connected to a server via a communication network, the navigation device comprising:
- a current-position-calculation section for calculating a current position of a vehicle;
a departure-point-setting section for setting a departure point;
a destination-setting section for setting a destination;
a transmitter section for transmitting the departure point set by the departure-point-setting section and the destination set by the destination-setting section to the server;
a receiver section for receiving a route starting from the departure point and reaching the destination transmitted from the transmitter section and for receiving a preparatory route starting from a departure point which is different from the starting point of the received route; and
a route-selecting section for selecting one of the route and the preparatory route received by the receiver section, the selected route being the closest to the current position of the vehicle calculated by the current-position-calculation section, the selected route being set as a route on which the vehicle is to be navigated.
1 Assignment
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Accused Products
Abstract
A server device 1 included in the route-search system 7 comprises a guided-navigation-route-search section 130 for searching a route starting from a departure point and reaching a destination; and a preparatory-route-search section 140 for searching a preparatory route in view of a possible deviation of the vehicle from a navigation route. The server device 1 transmits information on the navigation route and the preparatory route to the navigation device 2. When detecting the deviation of the vehicle, the navigation device 2 selects one of preparatory routes having nodes closest to the current position of the vehicle. The navigation device 2 searches a supplementary route connecting the current position of the vehicle to the nodes, and combines the preparatory route with the supplementary route to create a new route for continuing navigating the vehicle to the destination.
38 Citations
8 Claims
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1. A navigation device connected to a server via a communication network, the navigation device comprising:
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a current-position-calculation section for calculating a current position of a vehicle; a departure-point-setting section for setting a departure point; a destination-setting section for setting a destination; a transmitter section for transmitting the departure point set by the departure-point-setting section and the destination set by the destination-setting section to the server; a receiver section for receiving a route starting from the departure point and reaching the destination transmitted from the transmitter section and for receiving a preparatory route starting from a departure point which is different from the starting point of the received route; and a route-selecting section for selecting one of the route and the preparatory route received by the receiver section, the selected route being the closest to the current position of the vehicle calculated by the current-position-calculation section, the selected route being set as a route on which the vehicle is to be navigated. - View Dependent Claims (2)
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3. A route-search server used with a route-search system connectible to a navigation device via a communication network, the route-search server comprising:
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a storage section including a master roadmap database storing roadmap data used for route search; a route-search section for searching a route starting from a departure point and reaching a destination by referring to the master roadmap database; and a preparatory-route-searching section for searching a preparatory route starting from a node existing in the vicinity of the route searched by the route-search section and reaching the destination. - View Dependent Claims (4, 5, 6)
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7. A route-search system for navigating a vehicle, the route-search system comprising a navigation device, a route-search server liked to the navigation device via a communication network, wherein
the route-searching section comprises: -
a communication section for transmitting route search information to the navigation device and receiving the route search information from the navigation device; a storage section including a master roadmap database storing roadmap data used for route search; a route-search section for searching a route starting from a departure point and reaching a destination by referring to the master roadmap database; and a preparatory-route-searching section for searching a preparatory route starting from a node existing in the vicinity of the route searched by the route-search section and reaching the destination, wherein a transmitter section for transmitting information on the route searched by the route-search section and information on the preparatory route searched by the preparatory-route-searching section to the navigation device via the transmitter section, and wherein the navigation device comprises; a satellite radiowave receiver section for receiving satellite radiowaves used for positioning purpose; a position information acquisition section for calculating a current position of a vehicle by using the satellite radiowaves received by the satellite radiowave receiver section; a communication section for transmitting the route search information to the route-search server and receiving the route search information from the route-search server; a route information acquisition section for obtaining the route information from the route-search server via the communication section; a storage section storing therein the information on the route searched by the route-search section and included in the route information obtained by the route information acquisition section, the information on the preparatory route, and a roadmap database including roadmap data; a navigation control section for navigating the vehicle on the route searched from the route information stored in the storage section; and a route-searching section for searching the preparatory route that is the closest to the current position of the vehicle by using the information stored in the storage section if the navigation control section determines that the vehicle has deviated from the route searched by the route search section by considering the current position of the vehicle calculated by the position information acquisition section. - View Dependent Claims (8)
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Specification