Abstract: The invention concerns a radar for the control of civil aerial traffic, comprising a secondary radar (100) including a transmitter (110) and a receiver (120), and an antenna (500) of a secondary radar, wherein the signal at 1030 MHz, exiting the transmitter (110), is sent and transmitted into the air by the antenna (500), the antenna (500) receiving a response signal at 1090 MHz and a signal at 1030 MHz of reflection by aircraft, the signal at 1090 MHz being sent to the receiver (120), characterised in that it comprises a radar signal receiving and elaboration unit (200), said receiving and elaboration unit (200) receiving by said antenna (500) the reflection signal at 1030 MHz and being provided with means (300, 400) for the coherent elaboration of the same in order to extract the aircraft position.