Enhancement and implementation of a localization and communication system dedicated to guided transports

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Abstract
Nowadays, in maritime and airway domains, many intelligent systems are used for the localization and to exchange data information. However, in guided transports domain, no system is able to ensure these two functionalities. This paper presents a new system called CODIBT (communication, detection and identification of broken-down trains) allowing multi-user access and combining the two main functionalities: localization and high data flow rate communication. Such systems are developed in order to improve exploitation inside guided transport networks. Our laboratories designed an original radar system that allows inter-vehicle communication. This system is based on the principle of a co-operative radar using a transponder inside targets. It is made of a couple of transmitter/receiver which equips respectively the front and the rear of two successive vehicles. It uses a numerical correlation receiver and has a broad band of about 100 MHz which could be exploited to establish high data flow rate communications. The aim of this paper is to describe the mock-up realized and present some improvements of the coding methods developed using spreading spectrum techniques. Some simulations aimed to evaluate system performance in terms of BER together with main experimental results will be reported

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