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US 2017/0284792 A1Published application
Light pattern-based indoor positioning method
AssigneeHuazhong University of Science and Technology
InventorGuo PENG
Life of this patent
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Abstract
A light pattern-based indoor positioning method includes the following steps of: (1) setting a light pattern transmitting device; (2) detecting a light signal of the target to be positioned; and (3) positioning the position of the target to be positioned, to obtain a distance ρ from the target to be positioned to the rotating shaft of the blade, and a deflection angle θ of the target to be positioned relative to the reference line.
Claims6
A light pattern-based indoor positioning method, comprising the following steps of:
- (1) setting a light pattern transmitting device:
- the light pattern transmitting device comprising a light source, a blade and a motor, wherein
- the blade is connected with the motor, the motor drives the blade to make the blade rotate at a constant speed around a rotating shaft of the blade;
- a straight line where the rotating shaft of the blade is located passes through the center of the light source, and the rotating shaft is perpendicular to the ground;
- light emitted by the light source is blocked by the blade to form a shadow on the ground, and the shadow rotates periodically along with the blade to form a periodic light pattern;
- on a ground area covered periodically by the shadow, within the time of one cycle of rotation of the blade, the duration during which points on the ground area at different distances from the rotating shaft of the blade are kept to be covered by the shadow due to the periodic light pattern is different;
- a target to be positioned is located on the ground, and is covered periodically by the shadow;
- and
- the light source flashes periodically, and the cycle of the periodic flashing is the same as the cycle of rotation of the blade;
- (2) detecting a light signal of the target to be positioned:
- detecting light signal intensity received by the target to be positioned through a photosensitive sensor;
- within the time of one cycle of rotation of the blade, when the photosensitive sensor detects that the light signal intensity changes due to the periodic flashing of the light source, denoting the time as a reference time, and denoting a projection of a straight line passing through any two points on the blade on the ground at the reference time as a reference line, wherein the straight line passing through any two points on the blade and the straight line where the rotating shaft is located intersect with but do not coincide with each other;
- (3) positioning the position of the target to be positioned:
- according to changes of the light signal intensity with the periodic light pattern detected by the photosensitive sensor, judging a distance ρ from the target to be positioned to the rotating shaft of the blade, and a deflection angle θ of the target to be positioned relative to the reference line.
11 more elements
A light pattern-based indoor positioning method, comprising the following steps of:
- (1) setting a light pattern transmitting device:
- the light pattern transmitting device comprising a light source, a blade and a motor, wherein
- the blade is preferably a diamond, the plane where the diamond is located is parallel to the ground, the length of the long diagonal of the diamond is denoted as 2×R, and the length of the short diagonal of the diamond is denoted as D;
- the motor drives the blade to make the blade rotate at a constant speed, a connecting line between the center of the light source and the center of the blade is perpendicular to the ground, light emitted by the light source is blocked by the blade to form a shadow on the ground, and the shadow rotates periodically along with the blade to form a periodic light pattern;
- a target to be positioned is located on the ground, and is covered periodically by the shadow;
- and
- the light source flashes periodically, and the cycle of the periodic flashing is the same as the cycle of rotation of the blade;
- (2) detecting a light signal of the target to be positioned:
- detecting light signal intensity received by the target to be positioned through a photosensitive sensor;
- within the time of one cycle of rotation of the blade, when the photosensitive sensor detects that the light signal intensity changes due to the periodic flashing of the light source, denoting the time as a reference time, and denoting a straight line where a projection of a diamond long diagonal of the blade on the ground at the reference time is located as a reference line;
- (3) positioning the position of the target to be positioned:
- according to changes of the light signal intensity with the periodic light pattern detected by the photosensitive sensor, judging a distance ρ from the target to be positioned to the connecting line between the center of the light source and the center of the blade, and a deflection angle θ of the target to be positioned relative to the reference line.
9 more elements
Dependencies are inferred from the claim text.