Arturo Jimenez

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This article presents a process for the simultaneous determination of distances among objects in an indoor localization system using an acoustic sensor network. The proposed technique is based on a simultaneous time-of-flight measurement for the emitted acoustic signals from every object, without needing any additional signal to be used for synchronization.(More)
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(More)
This work describes the design of a ultrasonic local positioning system (ULPS) with large covered area. The beacons have been designed with a cylindrical PVDF transducer (piezofilm transducer) to which a conical reflector has been connected to enlarge the covered area and to guarantee 3D indoor positioning. The proposed ULPS for mobile robots (MR) uses(More)
The design of advanced sonar modules implies the use of more and more complex processing algorithms, in order to obtain as much information as possible from the environment. The use of simultaneous emission and reception techniques in certain transducers, that form an ultrasonic sensorial module, allows to increase the benefits and the performance of this(More)
In this work, several Code Division Multiple Access encoding schemes are evaluated for their application in ultrasonic sensory systems based on the determination of times-of-flight. Proper encoding improves the performance of such systems in terms of noise immunity, capability of simultaneous measurements and precision in the distance measurements.(More)
This work presents the development of a local positioning system (LPS), based on the transmission of ultrasonic signals, which have been previously encoded by loosely synchronous (LS) codes. The LPS consists of several ultrasonic emitters located at known positions in the environment, and of a portable receiver that computes its position by measuring the(More)
In this work, the performance of an acoustic relative positioning system is studied, by a Monte-Carlo analysis, with the aim of determining the obtained accuracy and precision. The system has been designed in order to be used in the relative positioning estimation of mobile objects which are not restricted to a particular environment and cannot depend on(More)
A new 3-D data recovering system based on structured light-colour projection for active scenes is presented in this paper. With the use of a light projector and a single camera the system is capable of easily solving the correspondence problem when a 6-connectivity colour disordered pattern illuminates the scene. Since the pattern is handled as a set, the(More)
Sensory systems for localization and mapping based on ranging allows to obtain not only the position of a mobile object but also the position of the beacons or landmarks. Using only ranging, the beacon positions are often calculated without needing to compute all the spatial relations among them. In this work, a preliminary study about the use of relative(More)
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(More)