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

摘要

The invention relates to a method for the radiometric calibration of the radar backscatter cross section RCSi of a number N of radar targets Ti, where i = 1, 2,..., N, and N ≥ 3, wherein at least one radar target T1 comprises a radar transmitter S1 having a transmitting antenna SA1 and a Radar receiver E1 having a receiver antenna EA1, wherein the radar receiver E1 and the radar transmitter S1 operate independently, a radar target T2 a radar transmitter S2 with a transmitting antenna SA2, a radar receiver E2 with a receiver antenna EA2, and a unit D2, with the radar transmitter S2 in a transponder mode TM of the radar target T2 is connected to the radar receiver E2, so that a signal S received by the radar receiver E2 is re-transmitted by the radar transmitter S2, and with the radar transmitter S2 in a radar mode RM of the radar target T2 not with the radar receiver E2 is connected so that the radar transmitter S2 and the radar receiver E2 operate independently, un d a radar target T3 has a radar transmitter S3 with a transmitting antenna SA3, a radar receiver E3 with a receiver antenna EA3, and a unit D3 with which the radar transmitter S3 is connected to the radar receiver E3, so that a signal S received by the radar receiver E3 from the radar transmitter S3 is sent out again, or the radar target T3 is a passive radar target, which reflects an incident signal S. The method comprises the following steps. In a first step 101, a signal S is transmitted by the radar transmitter Sk of one of the radar targets Tk with a transmission power PTk, j, receiving the signal S by another of the radar targets Tj, transmitting or reflecting the received signal S by the other radar target Tj, and receiving the signal S originating from the radar target Tj by the radar receiver Ek of the radar target Tk having the received power PRk, j, k, j ε {1, 2, ..., N} and k ≠ j. In a second step 102, the step 101 is carried out for N different pairings TkTj of radar targets Tk and Tj, the pairings TkTj and TjTk being identical. In a third step 103, based on known distances Dk, j of the radar transponders Tk and Tj, when carrying out steps 101 and 102 and determined ratios PRk, j / PTk, j, determination of the radar backscatter cross sections RCSi of the ...