a radar being carried by an aircraft includes means for transmitting an rf wave towards a target , said wave having a double form , a first waveform being composed of at least two sinusoids of different frequencies transmitted simultaneously , the radar comprising reception circuits receiving the signals reflected by the target and analysis means performing the detection of the target on the basis of the signals received . the second waveform is of the pulse type . the transmitted waveform is dependent on the relative speed of the target with respect to the carrier and on the absolute speed of the carrier .