In operating a radar sensor, a modulation sequence having a number n of successive linear frequency ramps having different slopes an is cyclically repeated. A received radar signal reflected from an object is mixed with the emitted radar signal to form an intermediate frequency signal, which is analyzed for each frequency ramp with respect to its frequency spectrum. Peaks occurring in the frequency spectra of the intermediate frequency signal correspond to ambiguity lines in a distance/velocity space. Possible objects are assumed at intersection points of the ambiguity lines. The expected position which the possible objects would have at the point in time of the repetition of the modulation sequence is precalculated. The slope an of at least one of the frequency ramps is established for a subsequent modulation sequence in such a way that none of the expected positions of a possible object in the distance/velocity space is at an intersection point of precalculated ambiguity lines of the other possible objects.