影响射频目标模拟系统的误差分析

Influence of errors on radio-frequency target simulation system

近场效应、衰减器与移相器本身的幅相漂移、射频传输各通路损耗的不一致性、天线安装的机械误差是影响射频目标模拟系统精度的4个主要因素。为使仿真实验中引入制导回路的误差最小,在阐明近场效应产生原理、推导二元定位公式基础上,通过建模仿真,分析了影响系统目标定位精度的程度及原因,推出了"三心"重合的补偿方法;针对衰减器、移相器的实际使用特点,分析了幅度误差和相位误差对目标位置精度的影响,提出了衰减器、移相器的幅相误差的补偿措施;剖析了天线安装引起的机械误差原因,提出了具体的补偿办法。最后,对射频目标模拟系统精度误差的产生顺序及解决方法进行了总结。

Radio-frequency simulation system is a key part of electronic countermeasure simulation system. Near-field effect, amplitude/phase drift of attenuator and phase shifter, cost variance of each channel in radiofrequency transfer and mechanical error in antenna mounting are four main factors that have effect on accuracy of the radio-frequency target simulation system. To minimize the error introduced in guidance loop in simulation experiment, we studied the causes of near-field effect and the duality orientation equation. By modeling and simulation, we analyzed the factors that have effect on target locating accuracy, and put forward a compensation method. Considering the practical application feature of attenuator and phase shifter, we analyzed the influence of amplitude error and phase error on accuracy of target locating, and put forward a method for compensating the amplitude/phase error. We also studied the causes of mechanical error in antenna mounting, and presented a compensation method. A summary is presented in the end.