UWB-based Local Positioning System: from a small-scale Experimental Platform to a large-scale Deployable System

A few years ago an experimental platform was designed and built in order to demonstrate the feasibility of Ultra-Wideband (UWB) technology applied to indoor positioning. This small-scale demonstrator proved to be a valuable research tool with the flexibility to study, test and assess the performance of various system architectures and signal processing algorithms. Based on this successful experience, the current follow-up R&D project aims to extend the research to other topics by pursuing two main objectives: a) designing and building a large-scale deployable UWB-based Local Positioning System (LPS), including its installation, calibration and operational testing in a real industrial environment; b) conceiving and developing Application Specific Integrated Circuits (ASICs) to target cost-competitive solutions. This paper addresses the main design issues analyzed during the requirements definition phase for this large-scale deployable LPS, considering that the new system should inherit whenever possible the design features already present in the small-scale experimental platform.

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Cyril Botteron, Pierre-André Farine, Christian Robert, Phillip Tomé
2010
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https://infoscience.epfl.ch/record/163025?ln=fr

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An Experimental Platform for an Indoor Location and Tracking System

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In this paper, an experimental platform for indoor location and tracking using ultra wideband (UWB) impulse radio signals is presented and its performance measured. The platform has been developed entirely using standard electronic components that are commercially available. As principal goal, the experimental platform has been designed to allow a rapid performance evaluation for various system architectures and signal processing algorithms. Hence, the platform is as versatile as possible while remaining optimized for accurate location estimation. To meet these targets, the UWB receivers are implemented using a fast analog to digital converter (ADC) and a field programmable gate array (FPGA). The ADC acquires directly the received radio frequency signal. The FPGA performs the required signal processing in real time and estimates the time of arrivals (TOAs) of the received pulses. The TOAs are transferred to a personal computer (PC), where the location of the transmitter is calculated. After the description of the hardware and the algorithms, the outcomes of a measurement campaign in a laboratory environment and the accuracy of the location system are presented.

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A Programmable Receiver for Communication Systems and Its Application to Impulse Radio

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The design of a programmable receiver for an ultra wideband (UWB) communication is presented. The receiver is using a fast analog to digital converter (ADC) and a field programmable gate array (FPGA) allowing a rapid performance evaluation for various system architectures and signal processing algorithms. To demonstrate the performance and the versatility of the receiver, a simple communication system and a localization system are implemented. The accuracy of the latter is presented for an indoor environment.

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Full-field laser Doppler perfusion imaging and monitoring with an intelligent CMOS camera

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A system for full-field laser Doppler blood flow imaging has been developed and tested on biomedical samples. The new imaging system allows 2D flow maps or monitoring flux signals to be obtained from a plurality of measured points simultaneously by using a 2D array of photodetectors. The detection part of the system is based on an intelligent CMOS camera with a built-in digital signal processor and memory. The imaging time of the system is as much as to 4 times faster than for the conventional scanning laser Doppler imager. The performance of the system was evaluated in vitro and in vivo. The first measurement results with this new system on human skin are reported. (C) 2005 Optical Society of America.

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Système

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