Ground surveillance airborne radar device, characterized in that it reproduces a mapping of STRIPMAP type of an area of interest divided into bands (101), the images of these bands being captured successively, each according to a technique of scan SAR type, the operations for processing the image of a band (101) being produced successively to the capture of the image of this band (101) and in a manner concomitant with the realization of at least one additional radar mode, before the capture of the image of the following band (101).
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