Positioning system and positioning method thereof

1. A positioning method used in a positioning system, wherein the positioning system comprises a plurality of base stations each having a corresponding signal receiver group comprising a plurality of fixed-type signal transceivers, and the positioning method comprises:

commanding the base stations to detect a tracked object and generate a plurality of first return information;

performing a first layer positioning to obtain a first position of the tracked object according to the first return information;

selecting some of the fixed-type signal transceivers according to the first position; and

commanding the selected fixed-type signal transceivers to detect the tracked object and perform a second layer positioning based on the first position to obtain a second position of the tracked object according to a plurality of second return information received from the selected fixed-type signal transceivers, wherein the first layer positioning has larger positioning error than the second layer positioning.

2. The positioning method according to claim 1 , wherein each first return information refers to time at which the tracked object is detected by the corresponding base station.

3. The positioning method according to claim 1 , further comprising:

commanding the base station to command the fixed-type signal transceivers in the corresponding signal receiver group to detect the tracked object.

4. The positioning method according to claim 3 , wherein each first return information refers to a receiver identification and a receiver position information of the corresponding fixed-type signal transceiver.

5. The positioning method according to claim 3 , wherein the first return information contain a receiver position information corresponding to one of the fixed-type signal transceivers which detects the tracked object, and the receiver position information is set as the first position.

6. The positioning method according to claim 1 , wherein each second return information comprises a position information of a transmission signal of the tracked object, an identity of the tracked object, a receiver identification and a receiver position information of the corresponding fixed-type signal transceiver.

7. The positioning method according to claim 6 , wherein the position information of the transmission signal comprises at least one of signal intensity and time.

8. The positioning method according to claim 1 , wherein in the step of commanding the selected fixed-type signal transceivers to detect the tracked object, the selected fixed-type signal transceivers are commanded to detect the tracked object through the corresponding base station of the selected fixed-type signal transceivers.

9. The positioning method according to claim 1 , further comprising:

setting the second position as a new first position; and performing the step of selecting the fixed-type signal transceivers according to the first position and the step of commanding the selected fixed-type signal transceivers to detect the tracked object and obtain the second position of the tracked object according to the second return information received from the fixed-type signal transceivers.

10. The positioning method according to claim 1 , wherein signals are transmitted and/or received between each of the fixed-type signal transceivers and the tracked object by using a low power consumption wireless technology.

11. The positioning method according to claim 1 , wherein the selected fixed-type signal transceivers are near the first position.

12. The positioning method according to claim 1 , wherein a positioning range is defined as a range within which the positioning system can position the tracked object, wherein in the positioning range, the distance between adjacent two base stations is longer than that between adjacent two fixed-type signal transceivers.

13. The positioning method according to claim 1 , wherein a positioning range is defined as a range within which the positioning system can position the tracked object, wherein in the positioning range, the quantity of the base stations is less than that of the fixed-type signal transceivers.

14. A positioning system, comprising:

a server;

at least one base station; and

at least one signal receiver group corresponding to the base station and comprising a plurality of fixed-type signal transceivers;

wherein the server commands the base station to detect a tracked object and perform a first layer positioning to obtain a first position of the tracked object, selects some of the fixed-type signal transceivers near the first position to detect the tracked object, and perform a second layer positioning based on the first position to obtain a second position of the tracked object according to a plurality of return information received from the selected fixed-type signal transceivers, wherein the first layer positioning has larger positioning error than the second layer positioning.

15. The positioning system according to claim 14 , wherein the server further sets the second position as a new first position, and again selects some of the fixed-type signal transceivers near the new first position to detect the tracked object, and obtains the second position of the tracked object according to the return information received from the selected fixed-type signal transceivers.

16. The positioning system according to claim 14 , wherein the server commands the base station to command the fixed-type signal transceivers in the corresponding signal receiver group to detect the tracked object and obtain the first position of the tracked object.

17. The positioning system according to claim 16 , wherein the server receives a receiver position information corresponding to one of the fixed-type signal transceivers which detects the tracked object and sets the receiver position information as the first position.

18. A positioning method used in a positioning system to detect a tracked object, comprises:

performing a first layer positioning to obtain a first position of the tracked object; and

performing a second layer positioning based on the first position to obtain a second position of the tracked object, wherein the first layer positioning has larger positioning error than the second layer positioning,

wherein the positioning system comprises a plurality of fixed-type signal transceivers, and, in the first layer positioning, a receiver position information corresponding to one of the fixed-type signal transceivers which detects the tracked object is set as the first position.

19. A positioning method used in a positioning system to detect a tracked object, comprises:

performing a first layer positioning to obtain a first position of the tracked object; and

performing a second layer positioning based on the first position to obtain a second position of the tracked object, wherein the first layer positioning has larger positioning error than the second layer positioning,

wherein the positioning system comprises a plurality of fixed-type signal transceivers, and, in the second layer positioning, some of the fixed-type signal transceivers near the first position are selected to detect the tracked object, and the second position of the tracked object is obtained according to a plurality of return information received from the selected fixed-type signal transceivers.