Method for remote routes calculation and navigation with automatic route detection and revision

• US 6,681,179 B1
• Filed: 02/15/2002
• Issued: 01/20/2004
• Est. Priority Date: 02/08/2002
• Status: Expired due to Fees

• Current Assignee: E-Lead Electronic Co., Ltd.
• Original Assignee: E-Lead Electronic Co., Ltd.
• Inventors: Chen, Stephen
• Primary Examiner(s): Zanelli, Michael J.
• Assistant Examiner(s): Gibson, Eric M
• Application Number:
  US10/075,229
• Time in Patent Office: 704 Days
• Field of Search: 701/209, 701/205, 701/207, 701/210, 340/988, 340/989, 340/995.25, 340/995.21
• US Class Current: 701/209
• CPC Class Codes: G01C 21/26 specially adapted for navigation in a road network
• CPC Class Codes: G08G 1/096811 where the route is computed offboard
• CPC Class Codes: G08G 1/096861 where the immediate route instructions are output to the driver, e.g. arrow signs for next turn
• CPC Class Codes: G08G 1/096872 where instructions are given per voice

Abstract

A method for remote routes calculation and navigation with automatic route detection and revision couples with navigation data transmission of a navigation center to increase navigation accuracy and greatly reduce data transmission between the navigation center and navigation required users. The method mainly includes calculating a linear deviation limit to serve as the maximum allowance limit to alert timely response for route deviations to enhance navigation accuracy.

Claims

1. A method for remote routes calculation and navigation with automatic route detection and revision comprising the steps of:

requesting a navigation center to transmit route data obtained from route calculations to a car phone;

providing coordinates and related data of every turning point on routes; and

providing a linear deviation limit of two neighboring fixed points for route navigation use to the car phone as a basis for self monitoring of deviation from a navigated route, wherein the linear deviation limit is a maximum ratio value adding an allowance, the ratio value being derived from the sum of a first straight line distance between any point on a planning route and a front fixed point of the planning route and a second straight line distance between the any point and a rear fixed point of the planning route against a third straight line distance between the front fixed point and the rear fixed point.

2. The method of claim 1, wherein navigation required equipment automatically emits return signals to the navigation center when the location of a moving vehicle deviates from a calculated and set navigation route.

3. The method of claim 2, wherein the return signals include an identification code for the calculated and set navigation route to allow the navigation center to compare the return signals with original data.

4. The method of claim 3, wherein the identification code of the planning route is a code added by the navigation center after route calculation and before storing, the identification code being transmitted to the car phone along with the planning route data.

5. The method of claim 2, wherein the return signals include coordinates of destination and current vehicle location to allow the navigation center to calculate a new route.

6. A method for remote routes calculation and navigation with automatic route detection and revision comprising the steps of:

requesting a navigation center to transmit route data obtained from route calculations to a car phone;

providing coordinates and related data of every turning point on routes; and

providing a linear deviation limit of two neighboring fixed points for route navigation use to the car phone as a basis for self monitoring of deviation from a navigated route, wherein a fixed point is inserted in a selected section of the route to divide an original single route to two route sections when the linear deviation limit exceeds a predetermined value, and new linear deviation limits are calculated.