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论述了电子定标法测试天线罩瞄准误差的原理方法,并分析了该方法成立的理由。电子定标法的步骤依次为:收发天线机械轴对准→天线和差通道自检→收发天线电轴对准→电子定标→无罩测试→带罩测试→查表计算天线罩瞄准误差。电子定标原理和实测结果表明:测试过程中接收天线差电压与和电压之商,可分解为相对自检过程的共模分量和正交分量;定标过程共模分量保持不变,它决定天线的零深;正交分量随收发天线夹角变化,不受天线零深影响,其曲线为定标曲线;无罩和带罩定标曲线线性度极好,其斜率为天线差斜率;天线加装高性能天线罩后,差斜率变化微小;故可以使用无罩天线差斜率和带罩测试的和差通道电压,计算得出天线罩瞄准误差。差斜率近似引入的误差很小,电子定标法成立。
The principle and method of measuring the aim error of the radome with the electronic calibration method are discussed. The reasons for the establishment of the method are also analyzed. The steps of the electronic calibration method are as follows: the mechanical axis alignment of the transceiver antenna → the antenna and the differential channel self-test → the antenna alignment of the transceiver antenna → the electronic calibration → the test without the cover → the test with the cover → the look-up table to calculate the aim error of the radome. The principle of electronic calibration and the measured results show that the quotient of the difference voltage and the voltage of the receiving antenna during the test can be decomposed into the common mode component and the quadrature component of the relative self-test process. The common mode component of the calibration process remains unchanged, The zero depth of the antenna; the orthogonal component changes with the included angle of the transmitting and receiving antennas, and is not affected by the zero-depth of the antenna, and the curve is a calibration curve; the calibration curve without the cover and the cover has excellent linearity with the slope as the antenna slope; With the addition of a high-performance radome, the difference slope is small; therefore, the radome’s aiming error can be calculated using the difference between the unshielded antenna slope and the shrouded test and the difference channel voltage. The error introduced by the difference slope is small, and the electronic calibration method is established.