Vehicle tracking detection and alarm method and navigation device using the method
View Patent ↗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.
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:
α
=
127
×
(
µ
+
i
)
×
180
V
_
×
π
,
where α represents the second maximum deflection, V represents the second average speed, μ represents a lateral force coefficient, i represents a lateral gradient, and π represents a circumference ratio.
9. The tracking detection and alarm method as claimed in claim 4 , wherein the second deflection is calculated using the following formula:
α
k
=
{
ABS
(
θ
k
-
θ
k
-
1
)
ABS
(
θ
k
-
θ
k
-
1
)
<
90
ABS
(
ABS
(
θ
k
-
θ
k
-
1
)
-
360
)
ABS
(
θ
k
-
θ
k
-
1
)
>
90
,
where α k represents the second deflection, ABS represents an absolute value function, θ k-1 and θ k respectively represent the first and second courses over ground, and k=1, 2, . . . , N.
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:
α
=
127
×
(
µ
+
i
)
×
180
V
_
×
π
,
where α represents the second maximum deflection, V represents the second average speed, μ represents a lateral force coefficient, i represents a lateral gradient, and π represents a circumference ratio.
18. The navigation device as claimed in claim 13 , wherein the determination module calculates the second deflection using the following formula:
α
k
=
{
ABS
(
θ
k
-
θ
k
-
1
)
ABS
(
θ
k
-
θ
k
-
1
)
<
90
ABS
(
ABS
(
θ
k
-
θ
k
-
1
)
-
360
)
ABS
(
θ
k
-
θ
k
-
1
)
>
90
,
where α k represents the second deflection, ABS represents an absolute value function, θ k-1 and θ k respectively represent the first and second courses over ground, and k=1, 2, . . . , N.