Embodiments herein disclose a pose detection device for a movable body and a location-based supplemental service providing system. The pose detection device includes a first polarization unit and a second polarization unit positioned to have transmission axis difference values different from each other, wherein the first polarization unit and the second polarization unit receiving light emitted from a polarized light source located beyond and apart from the first polarization unit and the second polarization unit. Further, the pose detection device includes a first illuminometer measures positioned below the first polarization unit and a second illuminometer positioned below the second polarization unit. Further, the pose detection device includes a an interpretation unit generating pose information of the movable body based on detected light variation curves for the first polarization unit and the second polarization unit and illumination values measured by the first illuminometer and the second illuminometer.