迭代算法在目标模拟器通道校准中的应用

Application of Iterative Algorithm in Target Simulator Channel Calibration

射频目标模拟器对目标位置的模拟精度取决于模拟器三元组或四元组中各通道信号的幅度、相位的馈电控的精度.本文基于二元定向原理,仿真分析了通道幅度、相位误差对目标位置模拟精度的影响,计算了在四元组方案下为模拟不同目标位置所需的四通道信号幅度控制量.在系统实现中,由于用于幅度及相位控制的衰减器与移相器存在各自的误差且相互关联,设计了基于先验误差数据的衰减、相移控制量生成的迭代算法.测试结果表明,该算法保证了目标位置的模拟精度.

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.