1. A radar comprising a modulator modulating a carrier microwave, this modulator including: a microwave mixer ( 21 ); means ( 23 ) for generating a modulation signal ( 22 ); the microwave entering on one input of the mixer ( 21 ) and the modulation signal ( 22 ) entering on the other input of the mixer, the output signal from the mixer being provided to the transmission means ( 25, 3 ) of the radar.