Communication to : AGARD SPP - Symposium on multi-sensor systems and data fusion for telecommunication : remote sensing and redar, Lisbonne (Portugal), 29 septembre - 2 octobre 1997SIGLEAvailable from INIST (FR), Document Supply Service, under shelf-number : 22419, issue : a.1997 n.177 / INIST-CNRS - Institut de l'Information Scientifique et TechniqueFRFranc