Near-field error correction on RFSS for applications

According to the applications for current RFSS(Radio Frequency Simulation System) developing, this paper proposes a near-field error correction method using mono-pulse amplitude comparison. This method produces two tables which are used to correct near-field error by adjusting the amplitudes on triad of antenna from the gradation direction to make the error of DOA(Direction-Of-Arrival) approaching zero. Meanwhile, this method focuses on the model of mono-pulse amplitude-comparison for seeker setting with a circular slot array of wave guide. Based on the character of symmetry for the slot array, the process of forming the SUM signal and MINUS signal is simplified. The precision of the tables for near-field error correction by our method satisfies the demands of RFSS with the deflection of 3×10^-3 degree for azimuth and 2×10^-3 degree for elevation. The simplified method also meets the demand of RFSS and reduces the running time by 55%.