Application of iterative algorithm in target simulator channel calibration

RF target simulator could simulate the target position by controlling the channels' amplitude and phase in three or four-element-array scheme, whilst the precision of simulated target position would be deeply influenced by any amplitude and phase errors of each channel. Based on the principle of binary array orientation, the influence of channels' amplitude and phase errors on target position precision was simulated and analyzed, and the ratio of channels' electric field intensity corresponding to different target positions was also calculated. Further, an iterative algorithm based on the priori test result of attenuators and phase shifters was developed to compensate the associated errors from the non-ideal attenuator and phase shifter elements. Experimental results prove that the proposed algorithm satisfies the requirements of accuracy.