Radar device for maritime surveillance

Partial synthetic aperture radar device intended for maritime surveillance and intended for being installed on a vehicle (S) moving at very high altitude and having a substantially decametric spatial resolution, characteristic of synthetic aperture radars, and a swath width, having a low repetition frequency, such that said swath width and said repetition frequency satisfy the expression c≈2·F·Fr·sin(inc), where c is the speed of propagation of radio waves, F is the swath width, Fr is the repetition frequency and inc is the incidence of the signal transmitted by said radar device, such that the swath width is large, and comprising means for integrating a plurality of images of a same zone in a coherent manner and in a non-coherent manner, in such a way as to improve the probability of detection of small targets in said zone.