Patent ReferencesNavigator for vehicles Portable map display apparatus Navigation apparatus for automobile Navigation system for automotive vehicle with automatic navigation start and navigation end point search and automatic route selection Vehicle navigational system and method On-board navigation system for motor vehicles Route searching system of navigation apparatus Location detecting method Patent #: 4999783 InventorsAssigneeApplicationNo. 691872 filed on 04/26/1991US Classes:701/209, Including route searching or determining device340/995.19, Route determination and display on map701/300RELATIVE LOCATIONExaminersPrimary: Black, Thomas G.Assistant: Zanelli, Michael J. Attorney, Agent or FirmInternational ClassG06F 015/50AbstractA vehicle navigation/position system (10) investigates road segments having start and end coordinates stored in a road map data memory (13). The system determines what road segments have at least a portion inside a rectangle of interest (ROI-100) about an estimated vehicle position (101). Map matching then corrects vehicle position by locating vehicle position on one of the road segments inside the rectangle of interest. Vehicle location/navigation information is then provided. A computer (11) identifies road segments as inside the rectangle of interest (100) by creating electrical signals associated with each road segment start/end coordinate as compared to boundary coordinates of the rectangle. These electrical signals identify the road segment coordinates with respect to areas (B-I) surrounding the rectangle of interest (A). For road segments extending between opposite middle side areas (B-I, C-G), the computer (11) determines the road segment inside the rectangle of interest, and the road segment is added to a list.Other References
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