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Airborne sonar is a robust sensing modality that has gained its popularity as a reliable and inexpensive means of determining the range to the closest obstacle. Nevertheless, it is impossible to extract bearing information from a single transducer if classical Time-of-Flight (TOF) measurements are used. For this reason, many sensors have been proposed in the last years that locate objects in the horizontal...
This paper presents a new algorithm to obtain the position of a mobile with an ultrasonic local positioning system (US-LPS). The system consists of five beacons placed in the ceiling covering a wide working area. The simultaneous emissions of all the beacons are synchronized, and encoded by using a DS-CDMA technique with five different 255-bit Kasami sequences. A receiver is placed on the mobile to...
Signal coding and pulse compression provide ultrasonic systems with the capability to obtain accurate measurements that are nearly independent of the conditions of operation. This property, together with the high robustness to noise also achieved with these techniques, are making possible the development of high reliability systems intended for outdoor operation. However, these systems must face new...
Ultrasonic transducers have been often used to develop local positioning systems (LPS) in the field of intelligent spaces. In these systems, it is necessary to design an ultrasonic beacon, which is distributed in the environment to cover a determined area where mobile robots or people can be located. This work describes the design and the implementation of an ultrasonic beacon in an FPGA-based platform...
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