Active GPS tracking system and method for reporting position thereof

1. An active GPS tracking system used to report a position of a target to a monitor center, comprising:

a user setting interface, used to receive a reporting distance;

a distance trigger module, used to calculate a moving distance of the active GPS tracking system and generate and send an interrupt signal when the moving distance is greater than or equal to the reporting distance;

a GPS module that enters a working mode if receiving the interrupt signal, and used to determine a current position of the active GPS tracking system, and determine whether an actual displacement is greater than or equal to the reporting distance to determine if the current position is required to be reported; and

a wireless communication module, used to receive the current position from the GPS module, wherein if the actual displacement is greater than or equal to the reporting distance, the wireless communication module reports the current position to the monitor center; and

a processor to execute the user setting interface, the distance trigger module, the GPS module and the wireless communication module;

wherein the GPS module enters a sleep mode if sending the current position.

2. The active GPS tracking system as claimed in claim 1 , wherein the distance trigger module comprising:

a velocity sensor, to sense a moving velocity of the active GPS tracking system;

an accumulator, to calculate the moving distance according to the moving velocity and a predetermined sensing time period; and

a comparing unit, to compare the moving distance with the reporting distance, and further generate and send the interrupt signal to the GPS module when the moving distance is greater than or equal to the reporting distance.

3. The active GPS tracking system as claimed in claim 2 , wherein when an actual displacement of the active GPS tracking system is greater than or equal to the reporting distance, the GPS module stores the current position instead of an initial position thereof, and resets the moving distance as zero, then enters the sleep mode.

4. The active GPS tracking system as claimed in claim 3 , wherein when the moving distance is reset as zero, the velocity sensor senses the moving velocity of the active GPS tracking system over again, and the accumulator recalculates the moving distance according to the moving velocity and the predetermined sensing time period.

5. The active GPS tracking system as claimed in claim 2 , wherein when the actual displacement is less than the reporting distance, the GPS module resets the moving distance as the actual displacement and enters the sleep mode.

6. The active GPS tracking system as claimed in claim 5 , wherein when the moving distance is reset as the actual displacement, the velocity sensor of the distance trigger module senses the moving velocity of the active GPS tracking system over again, and the accumulator of the distance trigger module recalculates the moving distance according to the moving velocity and the predetermined sensing time period.

7. A method of an active GPS tracking system reporting a position of a target to a monitor center comprising:

receiving a reporting distance, and making a GPS module determine and store an initial position and enter a sleep mode;

calculating a moving distance of the active GPS tracking system;

determining whether the moving distance is greater than or equal to the reporting distance;

if the moving distance is greater than or equal to the reporting distance, generating and sending an interrupt signal to the GPS module;

making the GPS module enter a working mode to determine a current position of the active GPS tracking system, and calculate an actual displacement of the active GPS tracking system;

determining whether the actual displacement is greater than or equal to the reporting distance; and

if the actual displacement is greater than or equal to the reporting distance, sending the current position of the active GPS tracking system to the wireless communication module, to report the current position to the monitor center, and entering the sleep mode.

8. The method as claimed in claim 7 , wherein calculating the moving distance of the active GPS tracking system comprising:

sensing a moving velocity of the active GPS tracking system; and

calculating the moving distance according to the moving velocity and a predetermined sensing time period.

9. The method as claimed in claim 8 , further comprising:

if the actual displacement is greater than or equal to the reporting distance, storing the current position of the active GPS tracking system;

resetting the moving distance as zero and entering the sleep mode; and

sensing the moving velocity of the active GPS tracking system over again, so as to recalculates the moving distance according to the moving velocity and the predetermined sensing time period.

10. The method as claimed in claim 8 , further comprising:

resetting the moving distance as the actual displacement and entering the sleep mode; and

sensing the moving velocity of the active GPS tracking system over again, so as to recalculates the moving distance according to the moving velocity and the predetermined sensing time period.