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Calibration of a Local Positioning System (LPS) is essential before the system can be used to localize static nodes or mobile devices. The authors have developed a cost efficient and high accurate Ultra Sound indoor positioning system called LOSNUS (LOcalization of Sensor Nodes by Ultra Sound), which is a type of locating system mainly used to localize static devices in a wireless sensor network (WSN)...
A compact 3D ultrasonic sensor for scene analysis is presented in this paper. A centered transmitter emits a broadband ultrasonic impulse which is reflected by obstacles in the environment. Reflected waves, if propagated back to the sensor, are then received by four identical ultrasonic microphones. These signals are used to provide polar- and azimuth information based on time difference of arrival...
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