POSITIONING METHOD AND POSITIONING SYSTEM BASED ON LIGHT INTENSITY

• US 20100225929A1
• Filed: 05/20/2009
• Published: 09/09/2010
• Est. Priority Date: 03/06/2009
• Status: Abandoned Application

• Current Assignee: Industrial Technology Research Institute
• Original Assignee: Industrial Technology Research Institute
• Inventors: Lin, Yu-Hsuan, Yeh, Lun-Wu, Lu, Che-Yen, Tseng, Yu-Chee, Lee, Yueh-Feng
• Application Number:
  US12/469,677
• Publication Number:
  US 20100225929A1
• Time in Patent Office: Days
• US Class Current: 356/615
• CPC Class Codes: G01S 5/16 using electromagnetic waves other than radio waves

Abstract

A positioning method and a positioning system based on light intensity are provided. The positioning system comprises a lighting system, a sense feedback device and a positioning module. The lighting system comprises at least three point light sources and sequentially adjusts luminance of these point light sources to light up a target. The sense feedback device is disposed on the target and used to collect light intensity information of the light projected on the target by the lighting system. The positioning module calculates a distance between the target and each of the point light sources based on the light intensity information and calculates a positioning location of the target based on the locations of the point light sources and the distances between the target and the point light sources.

Claims

1. A positioning method based on light intensity, comprising:

sequentially adjusting luminance of at least three point light sources of a lighting system, and collecting light intensity information of a light projected on a target by the lighting system according to the light intensity information;

calculating a distance between each of the point light sources and the target according to the light intensity information; and

calculating a positioning location of the target according to a location of each of the point light sources and the distance between the target and each of the point light sources.

2. The positioning method based on light intensity of claim 1, wherein the step of sequentially adjusting the luminance of the at least three point light sources of a lighting system, and collecting the light intensity information of the light projected on the target by the lighting system comprises:

adjusting the luminance of one of the point light sources to be a first luminance;

sensing a first light intensity of the light received by the target;

adjusting the luminance of the point light source to be a second luminance;

sensing a second light intensity of the light received by the target; and

sequentially adjusting the luminance of the other the point light sources by repeating above steps, so as to obtain the light intensity of the light received by the target and use the same as the light intensity information.

3. The positioning method based on light intensity of claim 2, wherein the step of calculating a distance between each of the point light sources and the target according to the light intensity information comprises:

calculating a light intensity difference between the first light intensity and the second light intensity; and

calculating the distance corresponding to the light intensity difference and using the same as the distance between the target and the light source based on a relation that the light intensity is inversely proportional to the square of the distance.

4. The positioning method based on light intensity of claim 1, wherein the step of calculating the positioning location of the target according to the location of each of the point light sources and the distance between the target and each of the point light sources comprises:

respectively deriving a sphere equation corresponding to each of the light sources by using the location of the light source as a center and using the distance between the target and the light source as a radius;

calculating two intersection points of the sphere equations of the three point light sources; and

selecting the intersection point located at a front side of the lighting system to be the positioning location of the target.

5. The positioning method based on light intensity of claim 1, wherein after the step of calculating the positioning location of the target, the method further comprises:

adjusting an irradiation angle of each of the point light sources of the lighting system, so as to make the point light sources face the target.

6. The positioning method based on light intensity of claim 5, wherein the step of adjusting an irradiation angle of each of the point light sources of the lighting system, so as to make the point light sources face the target comprises:

respectively calculating a relative angle of each of the point light sources with respect to the target according to the location of each of the point light sources and the positioning location of the target;

respectively calculating an included angle between the relative angle of each of the point light sources and the irradiation angle; and

shifting each of the point light sources by the corresponding included angle so as to make a front of each of the point light sources face the target.

7. The positioning method based on light intensity of claim 1, wherein after the step of calculating the positioning location of the target, the method further comprises:

shifting the location of the lighting system so as to make an average of the distances between each of the point light sources and the target is the shortest.

8. The positioning method based on light intensity of claim 1, wherein after the step of calculating the positioning location of the target, the method further comprises:

receiving a light intensity value inputted by a user; and

adjusting the luminance of each of the point light sources of the lighting system, so as to make the light intensity of the light received by the target to match the light intensity value inputted by the user.

9. The positioning method based on light intensity of claim 8, wherein before the step of adjusting the luminance of each of point light sources of the lighting system, the method further comprises:

adjusting an irradiation angle of each of the point light sources of the lighting system, so as to make the point light sources face the target.

10. The positioning method based on light intensity of claim 8, wherein before the step of adjusting the luminance of each of the light sources of the lighting system, the method further comprises:

shifting the position of the lighting system, so as to make an average of the distances between the target and each of the point light sources is the shortest.

11. The positioning method based on light intensity of claim 8, wherein the step of adjusting the luminance of each of the point light sources of the lighting system, the method further comprises:

adjusting the luminance of the point light sources according to the distance between the target and each of the point light sources, so as to make the luminance of the point light source which is closest to the target be greater than the luminance of the other point light sources.

12. A positioning system based on light intensity, comprising:

a lighting system, comprising at least three point light sources, for sequentially adjusting luminance of the point light sources to project a light;

a sense feedback device, for collecting light intensity information of the light projected by the lighting system; and

a positioning module, for calculating a distance between each of the point light sources and the sense feedback device according to the light intensity information collected by the sense feedback device, and calculating a positioning location of the sense feedback device according to a location of each of the point light sources and the distance between each of the point light sources and the sense feedback device.

13. The positioning system based on light intensity of claim 12, wherein the lighting system comprises adjusting the luminance of one of the point light sources to be a first luminance, the sense feedback device senses a first light intensity of the light projected by the lighting system, the lighting system readjusts the luminance of the light source to be a second luminance, and the sense feedback device senses a second light intensity of the light projected by the lighting system.

14. The positioning system based on light intensity of claim 13, wherein the lighting system comprises repeatedly adjusting the luminance of the other point light sources, and the sense feedback device senses the light intensity of the light projected by the lighting system and uses the same as the light intensity information.

15. The positioning system based on light intensity of claim 13, wherein the positioning system comprises calculating a light intensity difference between the first light intensity and the second light intensity, calculating the distance corresponding to the light intensity difference, and using the same as the distance between each of the plurality of the light sources and the sense feedback device based on a relation that the light intensity is inversely proportional to the square of the distance.

16. The positioning system based on light intensity of claim 12, wherein the positioning module comprises respectively deriving a sphere equation corresponding to each of the light sources by using the position of the light source as a center and using the distance between the light source and the sense feedback device as a radius, calculating two intersection points of the sphere equations of the three point light sources, and selecting the intersection point located at a front side of the lighting system to be the positioning location of the sense feedback device.

17. The positioning system based on light intensity of claim 12, wherein the positioning module comprises being disposed on the sense feedback device.

18. The positioning system based on light intensity of claim 17, wherein the sense feedback device comprises:

a light intensity sensor, for sensing the light intensity information of the light projected by the lighting system so as to provide the light intensity information to the positioning module; and

a data transmission module, for sending the positioning location calculated by the positioning module to the lighting system.

19. The positioning system based on light intensity of claim 18, wherein the lighting system further comprises:

a first control unit, for adjusting an irradiation angle of each of the point light sources according to the positioning location of the sense feedback device, so as to make the point light sources face the sense feedback device.

20. The positioning system based on light intensity of claim 19, wherein the first control unit comprises respectively calculating a relative angle of each of the point light sources with respect to the sense feedback device according to the positioning location of the sense feedback device and the location of each of the point light source, calculating an included angle between the relative angle of each of the point light sources and the irradiation angle, and shifting each of the point light sources by the corresponding included angle, so as that make a front of each of the point light sources face the sense feedback device.

21. The positioning system based on light intensity of claim 18, wherein the lighting system further comprises:

a second control unit, for shifting the position of each of the point light sources so as to make an average of the distances between each of the point light sources and the sense feedback device being the shortest.

22. The positioning system based on light intensity of claim 18, wherein the sense feedback device further comprises:

an input unit, for receiving a light intensity value inputted by a user.

23. The positioning system based on light intensity of claim 22, wherein the data transmission module further comprises sending the light intensity value received by the input unit to the lighting system.

24. The positioning system based on light intensity of claim 23, wherein the lighting system further comprises:

a third control unit, for adjusting the luminance of each of the point light sources, so as to make the light intensity of the light received by the sense feedback device match the light intensity value inputted by the user.

25. The positioning system based on light intensity of claim 24, wherein the third control unit comprises adjusting the luminance of the point light sources according to the distances between the point light sources and the sense feedback device, so as to make the luminance of the point light source, which is closest to the sense feedback device, be greater than the luminance of the other point light sources.

26. The positioning system based on light intensity of claim 12, wherein the positioning module comprises being disposed on the lighting system.

27. The positioning system based on light intensity of claim 26, wherein the sense feedback device comprises:

a light intensity sensor, for sensing the light intensity information of the light projected by the lighting system, so as to provide the light intensity information to the positioning module; and

a data transmission module, for sending the positioning location collected by the sense feedback device to the lighting system for the positioning module to calculate the positioning location of the sense feedback device.

28. The positioning system based on light intensity of claim 27, wherein the lighting system further comprises:

a fourth control unit, for adjusting an irradiation angle of each of the point light sources according to the positioning location of the sense feedback device, so as to make the point light sources face the sense feedback device.

29. The positioning system based on light intensity of claim 28, wherein the fourth control unit comprises respectively calculating a relative angle of each of the point light sources with respect to the sense feedback device according to the position of each of the point light sources and a positioning location the sense feedback device, calculating an included angle between the relative angle corresponding to each of the point light sources and the irradiation angle, and shifting each of the point light sources by the corresponding included angle, so as to make a front of each of the point light sources face the sense feedback device.

30. The positioning system based on light intensity of claim 27, wherein the lighting system further comprises:

a fifth control unit, for shifting the position of each of the point light sources, so as to make an average of the distances between each of the point light sources and the sense feedback device being the shortest.

31. The positioning system based on light intensity of claim 27, wherein the sense feedback device further comprises:

an input unit, for receiving a light intensity value inputted by a user.

32. The positioning system based on light intensity of claim 31, wherein the data transmission module further comprises sending the light intensity value received by the input unit to the lighting system.

33. The positioning system based on light intensity of claim 32, wherein the lighting system further comprises:

a sixth control unit, for adjusting luminance of each of the point light sources, so as to make the light intensity of the light received by the sense feedback device match the light intensity value inputted by the user.

34. The positioning system based on light intensity of claim 32, wherein the sixth control unit comprises adjusting the luminance of the point light sources according to the distances between the point light sources and the sense feedback device, so as to make the luminance of the point light source, which is closest to the sense feedback device, be greater than the luminance of the other point light sources.