Abstract
We developed an improved algorithm for an indoor positioning system based on an image sensor. By using the algorithm that tilts the image sensor when it is placed at room corners, the authors reduced the positioning error at the corners and increased the effective positioning area. When in room corners, the image sensor is placed at an appropriate angle that allows the reception of light from all three light-emitting diodes (LEDs). The unknown sensor position is calculated from the geometrical relations among the LED images created on the tilted image sensor plane. According to the obtained experimental results, signal-to-noise ratio of the received signal can be improved when the image sensor tilts at certain angle at the corner. It was found that the effective range of the tilt angle of the image sensor is estimated to be within the range of 30°-60° at the corners. The root mean-square of the positioning error obtained with the developed algorithm is 0.6 mm when the image sensor is located within the effective positioning area. The effective positioning area was increased by 15.3% at the corner areas when the image sensor was tilted by the optimal angle.
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