An interferometric radar comprising an arm (2), which rotates with respect to an axis (z) of a plane (zx) orthogonal to an axis of rotation (y), a system of antennas (1), which are fixed to said arm (2), are able both to move along the arm and to describe complete revolutions along a circular path about said axis (y), and are oriented in a direction of sight (a) parallel to the axis (y), motor-drive means (3) for driving the arm (2) and the system of antennas along the arm, a data-acquisition and processing unit (10) operatively connected to said antenna (1) for acquiring a succession of images detected by the antenna during its revolution about the axis (y) and making differential interferometric calculations for measuring at least one component of the displacement of one or more targets in the field of view.