METHOD FOR ADJUSTING DISPLAYED NAVIGATION DIRECTION USING SENSORS AND NAVIGATION DEVICE USING THE SAME

• US 20100235093A1
• Filed: 02/26/2010
• Published: 09/16/2010
• Est. Priority Date: 03/10/2009
• Status: Active Grant

• Current Assignee: MiTAC International Corporation (MiTAC Holdings Corp.)
• Original Assignee: MiTAC International Corporation (MiTAC Holdings Corp.)
• Inventors: CHANG, Chien-Yang
• Granted Patent: US 8,234,062 B2
• Time in Patent Office: Days
• US Class Current: 701/208
• CPC Class Codes: G01C 21/367 Details, e.g. road map scale, orientation, zooming, illumination, level of detail, scrolling of road map or positioning of current position marker

Abstract

A method for adjusting displayed map using sensors is disclosed, applied in a navigation device. The method includes steps of: calculating a GPS-based rotating angle of the navigation device based on location information detected by a GPS module of the navigation device when a coordinate error value of the navigation device is less than a predetermined value; using a sensor of the navigation device to detect the sensor-based rotating angle of the navigation device when the coordinate error value of the navigation device is greater than the predetermined value; rotating a map on the screen according to one of the GPS-based rotating angle and the sensor-based rotating angle depending on the coordinate error value.

Claims

1. A method for adjusting displayed map using sensors, applied in a navigation device, comprising the steps of:

calculating a GPS-based rotating angle of the navigation device based on location information detected by a GPS module of the navigation device when a coordinate error value of the navigation device is less than a predetermined value;

using a sensor of the navigation device to detect the sensor-based rotating angle of the navigation device when the coordinate error value of the navigation device is greater than the predetermined value;

rotating a map on the screen according to one of the GPS-based rotating angle and the sensor-based rotating angle depending on the coordinate error value.

2. The method as claimed in claim 1, wherein the rotating the map further comprising:

setting a map angle of the map as one of the GPS-based rotating angle and the sensor-based rotating angle; and

rotating the map by the map angle.

3. The method as claimed in claim 1, wherein rotating a map further comprising:

comprises;

defining the sensor-based rotating angle of the sensor, and a current angle of the navigation device;

subtracting the sensor-based rotating angle of the sensor from the GPS-based rotating angle of the navigation device to obtain a angle variation value;

setting a map angle as the current angle plus the angle variation value; and

rotating the map by the map angle.

4. The method as claimed in claim 1, wherein the sensor is a G/M sensor or a gyroscope.

5. A navigation device, comprising:

a screen for displaying a map;

a GPS module for calculating a GPS-based rotating angle of the navigation device based on a location information detected by the GPS module of the navigation device when a coordinate error value of the navigation device is less than a predetermined value;

a sensor for detecting a sensor-based rotating angle of the navigation device when the coordinate error value of the navigation device is greater than a predetermined value; and

a microprocessor for rotating a map according to one of the GPS-based rotating angle and the sensor-based rotating angle depending on the coordinate error value.

6. The navigation device as claimed in claim 5, wherein the microprocessor further sets a map angle of the map as one of the GPS-based rotating angle and the sensor-based rotating angle;

and rotates the map by the map angle.

7. The navigation device as claimed in claim 5, wherein the microprocessor further defines the sensor-based rotating angle of the sensor, and a current angle of the navigation device;

subtracts the sensor-based rotating angle of the sensor from the GPS-based rotating angle of the navigation device to obtain a angle variation value;

sets a map angle as the current angle plus the angle variation value; and

rotates the map by the map angle.

8. The navigation device as claimed in claim 5, wherein the sensor is a G/M sensor or a gyroscope.

9. A computer-readable record medium for executing a method for adjusting displayed map, comprising:

calculating a GPS-based rotating angle of the navigation device based on location information detected by a GPS module of the navigation device when a coordinate error value of the navigation device is less than a predetermined value;

using a sensor of the navigation device to detect the sensor-based rotating angle of the navigation device when the coordinate error value of the navigation device is greater than the predetermined value;

rotating a map on the screen according to one of the GPS-based rotating angle and the sensor-based rotating angle depending on the coordinate error value.

10. The computer-readable record medium as claimed in claim 9, wherein the rotating a map comprises:

setting a map angle of the map as one of the GPS-based rotating angle and the sensor-based rotating angle; and

rotating the map by the map angle.

11. The computer-readable record medium as claimed in claim 9, wherein the rotating a map comprises:

defining the sensor-based rotating angle of the sensor, and a current angle of the navigation device;

subtracting the sensor-based rotating angle of the sensor from the GPS-based rotating angle of the navigation device to obtain a angle variation value;

setting a map angle as the current angle plus the angle variation value; and

rotating the map by the map angle.