VEHICLE TRACKING DETECTION AND ALARM METHOD AND NAVIGATION DEVICE USING THE METHOD

• US 20120143494A1
• Filed: 12/28/2010
• Published: 06/07/2012
• Est. Priority Date: 12/03/2010
• Status: Active Grant

• Current Assignee: Ambit Microsystems Limited (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Ambit Microsystems Limited (Hon Hai Precision Industry Co., Ltd.), Hon Hai Precision Industry Co., Ltd.
• Inventors: LI, DONG-MING, LU, CHI-MING, TENG, WEI
• Granted Patent: US 8,538,690 B2
• Time in Patent Office: Days
• US Class Current: 701/424
• CPC Class Codes: G01C 21/3407 specially adapted for specific applications
• CPC Class Codes: G01C 21/3697 Output of additional, non-guidance related information, e.g. low fuel level G01C21/3679 takes precedence
• CPC Class Codes: G01S 19/52 Determining velocity

Abstract

A tracking detection and alarm method which is applied to a navigation device use a number of positioning data points retrieved from a navigation module of the navigation device. A number of deflections and a number of average speeds that correspond to the position data points are calculated and generated. A number of maximum deflections are calculated and generated according to the average speeds. When a deflection of a positioning data point is greater than a maximum safe deflection thereof, one is added to a frequency of unsafe driving instances. When the frequency of unsafe driving instances is greater than a preset threshold value, an unsafe driving alarm is activated.

Claims

1. A tracking detection and alarm method of a navigation device of a vehicle, the method comprising:

retrieving a plurality of positioning data points, generated based on locations of the vehicle, from a navigation module of the navigation device;

calculating and generating a plurality of deflections and a plurality of average speeds that corresponds to the position data points;

calculating and generating a plurality of maximum deflections according to the average speeds;

when a deflection of a positioning data point is greater than a maximum deflection thereof, adding one to a frequency of unsafe driving; and

when the frequency of unsafe driving is greater than a preset threshold value, sending out an unsafe driving alarm.

2. The tracking detection and alarm method as claimed in claim 1, wherein the step of retrieving the positioning data points further retrieves a plurality of speeds over ground and a plurality of courses over ground from the positioning data points for calculating the deflections and the average speeds.

3. The tracking detection and alarm method as claimed in claim 1, wherein the positioning data points are generated with National Marine Electronics Association data format.

4. A track detection and alarm method, applied to a navigation device of a vehicle, the method comprising:

performing a positioning operation using a navigation module of the navigation device;

retrieving a first positioning data point and a second positioning data point, generated based on locations of the vehicle, from the navigation module;

calculating and generating a second deflection and a second average speed of the second position data point;

calculating and generating a second maximum deflection of the second positioning data point according to the second average speed;

when the second deflection is greater than the second maximum deflection, adding one to a frequency of unsafe driving; and

when the frequency of unsafe driving is greater than a preset threshold value, sending out an unsafe driving alarm.

5. The tracking detection and alarm method as claimed in claim 4, further comprising:

retrieving a first speed over ground from the first positioning data point;

retrieving a second speed over ground from the second positioning data point; and

calculating and generating the second average speed according to the first and second speeds over ground.

6. The tracking detection and alarm method as claimed in claim 4, further comprising:

retrieving a first course over ground from the first positioning data point;

retrieving a second course over ground from the second positioning data point; and

calculating and generating the second deflection according to the first and second courses over ground.

7. The tracking detection and alarm method as claimed in claim 4, further comprising, when one of the first and second positioning data points is retrieved, determining whether the retrieved positioning data point is valid according to a positioning status.

8. The tracking detection and alarm method as claimed in claim 4, wherein the second maximum deflection is calculated using the following formula:

9. The tracking detection and alarm method as claimed in claim 4, wherein the second deflection is calculated using the following formula:

10. A navigation device, comprising:

a navigation module to generate a plurality of positioning data points and retrieve the positioning data points from the navigation module;

a calculation module to calculate and generate a plurality of deflections and a plurality of average speeds that corresponds to the position data points;

a determination module to calculate and generate a plurality of maximum deflections according to the average speeds, when a deflection of a positioning data point is greater than a maximum deflection thereof, add one to a frequency of unsafe driving, and, when the frequency of unsafe driving is greater than a preset threshold value, send out an unsafe driving alarm; and

an output device to display the unsafe driving alarm.

11. The navigation device as claimed in claim 10, further comprising an analysis module to retrieve a plurality of speeds over ground and a plurality of courses over ground from the positioning data points for calculating the deflections and the average speeds.

12. The navigation device as claimed in claim 10, wherein the positioning data points are generated with National Marine Electronics Association data format.

13. A navigation device, comprising:

a navigation module to perform a positioning operation, generate a first positioning data point and a second positioning data point, and retrieve the first and second positioning data points from the navigation module;

a calculation module to calculate and generate a second deflection and a second average speed of the second position data point;

a determination module to calculate and generate a second maximum deflection of the second positioning data point according to the second average speed, when the second deflection is greater than the maximum second deflection, add one to a frequency of unsafe driving, and, when the frequency of unsafe driving is greater than a preset threshold value, send out an unsafe driving alarm; and

an output device to display the unsafe driving alarm.

14. The navigation device as claimed in claim 13, further comprising an analysis module, wherein:

the analysis module retrieves a first speed over ground from the first positioning data point and a second speed over ground from the second positioning data point; and

the calculation module calculates and generates the second average speed according to the first and second speeds over ground.

15. The navigation device as claimed in claim 13, further comprising an analysis module, wherein:

the analysis module retrieves a first course over ground from the first positioning data point and a second course over ground from the second positioning data point; and

the calculation module calculates and generates the second deflection according to the first and second courses over ground.

16. The navigation device as claimed in claim 13, wherein when one of the first and second positioning data points is retrieved, the navigation module determines whether the retrieved positioning data point is valid according to a positioning status.

17. The navigation device as claimed in claim 13, wherein the determination module calculates the second maximum deflection using the following formula:

18. The navigation device as claimed in claim 13, wherein the determination module calculates the second deflection using the following formula: