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Route entry guiding device and method in a navigation system using a portable terminal

  • US 6,708,111 B2
  • Filed: 05/03/2002
  • Issued: 03/16/2004
  • Est. Priority Date: 05/03/2001
  • Status: Expired due to Fees
First Claim
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1. A route entry guidance device in a navigation system using a portable terminal, including a navigation component, comprising:

  • a transmitter/receiver for transmitting information including a departure point and a destination entered by a user to a traffic information center over a wireless network and receiving optimum route data from the traffic information center over the wireless network in response to the transmitted information;

    a guiding mode determiner for calculating a shortest distance to an optimum route indicated by the optimum route data and determining a guiding mode according to the shortest distance, if the optimum route data does not include a road where a vehicle is currently positioned;

    a heading determiner for determining a heading of the vehicle with respect to true north using latitude and longitude coordinates of two points measured by a GPS (Global Positioning System);

    a projection direction determiner for calculating a relative angle of a projection direction to the optimum route with respect to the vehicle and determining a direction to the optimum route according to the calculated relative projection direction angle; and

    a route direction determiner for calculating a relative angle of the direction the optimum route runs with respect to the vehicle and determining a route direction according to the calculated relative route direction angle, wherein the vehicle is guided to the entry to the optimum route according to the determined guiding mode, direction to the optimum route, and route direction.

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