Omnidirectional ultrasonic location sensor

Rapid construction of the human activity observation system at low cost is necessary with respect to research into human activities and commercialization. The authors have developed an ultrasonic 3D tag system that uses ultrasonic transmitters/receivers for observing human activities. The newly developed system monitors the positions of objects to which transmitters are attached. The ultrasonic 3D tag system can be installed in a wide variety of environments, but the time and the installation cost required to install the numerous required receivers are prohibitive. Therefore, the present authors developed an omnidirectional ultrasonic location sensor. The omnidirectional ultrasonic location sensor is useful because the number of sensors to be attached can be reduced. The present paper proposes an omnidirectional ultrasonic location sensor and reports its feasibility