1. A method for detecting aerial targets, implemented by a multifunction radar comprising an antenna subdivided into at least two antenna portions, each antenna portion being configured to perform the transmission and the reception of a signal, the method comprising: each antenna portion of the radar is configured to transmit signals on distinct frequency bands, during the transmission phases of an antenna portion, the reception of each antenna portion of the radar is cut resulting in a reception signal comprising missing data, the radar is configured to simultaneously perform at least two radar functions including an aerial target detection function, and wherein the method comprises, for each range gate: a step of reception of signals, a step of estimation, from the signals received, of a space-time autocorrelation matrix so as to model the spurious ground echoes, a step of target detection using a statistical test by taking into account missing data in the reception signals and said space-time autocorrelation matrix.