Method for the detection and location of generators of ADS-B spoofers by a radar system comprising at least one secondary radar, an ADS-B spoofer being a false ADS-B squitter, an ADS-B squitter being an aircraft position information signal transmitted to receivers including the receivers of the radars of said system, said ADS-B squitters being detected over time at different bearings of the antenna , said method being characterized in that it comprises, for each secondary radar, at least the following steps: - a first step of detection of an ADS-B spoofer; - a second step of location of the azimuth position of said ADS-B spoofer generator, said second step comprising the following operations: • measurement of the azimuth of the antenna of the secondary radar and of the received powers on the sum, difference and control patterns of the antenna upon the detection of an ADS-B squitter; • generation and storage of at least one assumption of azimuth of said spoofer for each ADS-B squitter detected, said assumption being equal to the sum of the azimuth of said antenna and of an assumption of estimated bearing of said spoofer, said estimated bearing being characterized by the convergence between the pair of the ratios of the received power on the sum pattern to the received power on the control pattern on the one hand and by the ratio of the received power on the difference pattern to the received power on the control pattern on the other hand, and the same pairs for the different possible known bearings of the antenna, said second step further performing an accumulation of said assumptions over a given period of time, the azimuth of said ADS-B spoofer being a function of said assumptions. - a first step of detection of an ADS-B spoofer; - a second step of location of the azimuth position of said ADS-B spoofer generator, said second step comprising the following operations: • measurement of the azimuth of the antenna of the secondary radar and of the received powers on the sum, difference and control patterns of the antenna upon the detection of an ADS-B squitter; • generation and storage of at least one assumption of azimuth of said spoofer for each ADS-B squitter detected, said assumption being equal to the sum of the azimuth of said antenna and of an assumption of estimated bearing of said spoofer, said estimated bearing being characterized by the convergence between the pair of the ratios of the received power on the sum pattern to the received power on the control pattern on the one hand and by the ratio of the received power on the difference pattern to the received power on the control pattern on the other hand, and the same pairs for the different possible known bearings of the antenna, • measurement of the azimuth of the antenna of the secondary radar and of the received powers on the sum, difference and control patterns of the antenna upon the detection of an ADS-B squitter; • generation and storage of at least one assumption of azimuth of said spoofer for each ADS-B squitter detected, said assumption being equal to the sum of the azimuth of said antenna and of an assumption of estimated bearing of said spoofer, said estimated bearing being characterized by the convergence between the pair of the ratios of the received power on the sum pattern to the received power on the control pattern on the one hand and by the ratio of the received power on the difference pattern to the received power on the control pattern on the other hand, and the same pairs for the different possible known bearings of the antenna, <EOS>