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Cooperative multi-user detection and ranging based on pseudo-random codes

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Author(s): C. Morhart | E. M. Biebl

Journal: Advances in Radio Science - Kleinheubacher Berichte
ISSN 1684-9965

Volume: 7;
Start page: 55;
Date: 2009;
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ABSTRACT
We present an improved approach for a Round Trip Time of Flight distance measurement system. The system is intended for the usage in a cooperative localisation system for automotive applications. Therefore, it is designed to address a large number of communication partners per measurement cycle. By using coded signals in a time divison multiple access order, we can detect a large number of pedestrian sensors with just one car sensor. We achieve this by using very short transmit bursts in combination with a real time correlation algorithm. Futhermore, the correlation approach offers real time data, concerning the time of arrival, that can serve as a trigger impulse for other comunication systems. The distance accuracy of the correlation result was further increased by adding a fourier interpolation filter. The system performance was checked with a prototype at 2.4 GHz. We reached a distance measurement accuracy of 12 cm at a range up to 450 m.
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