Method for absolute radiometric calibration of the radar cross-section of radar targets

Method for radiometric calibration of the radar cross section of at least 3 radar targets, at least one of which operates in a transponder mode (fig. 1, 220) and another one of which may be passive. In a first step 101, a signal is emitted from a first radar target with a transmission power PT, this signal is received by a second radar target, and then the received signal is emitted or reflected by the second target to the first target, and received by the first target with receiving power PR. In a second step 102, this initial step is repeated for each different pairing of targets. In a third step 103, the radar cross section of the second radar target is determined based on a given relationship (radar equation) between ascertained ratio of PR/PT and other known values of gain, distances and wavelength. Each of the 3 steps may be executed for different transmitting frequencies of the transmitters, different distances of the targets, or different polarisations of the signal.