@INPROCEEDINGS {11819,
author={J. Sanguino and S. M. Marques and L. P. Pontes and J. Leitão},
doi={},
booktitle={ESA DASIA},
title={Architecture of a GPS-based Transponder. Application to a Vessel Traffic System},
year={1999},
month={May},
volume={--},
pages={503-509} 
}