基于MARS的多径干扰抑制方法与实验研究

Research on the Multipath Interference Suppression Method and Experiment Based on MARS

多径干扰是天线测量中普遍存在的环境干扰,它通常是由待测天线附近的设备对测试信号的反射所引起。针对天线定标中的多径干扰问题,提出采用数字吸波体反射抑制(MARS)技术对天线接收信号进行模式滤波,将信号中的多径干扰分量进行分离并滤除,进而降低测量环境中的多径效应。推导了相关公式,在天线平面近场测量系统中对该技术的效果进行了验证,实验中采用分布于待测天线附近的多个角反射器模拟环境中的反射源。结果表明该方法可以有效降低测量环境中多径效应对测量结果的影响,在待测天线最大辐射方向上的平均增益误差小于0.1dB,提高了天线测量精度。

Multipath interference is a common environmental interference in antenna measurement.It is usually caused by the reflection of the test signal from the equipment near the antenna under test(AUT).To solve the problem of multipath interference in antenna calibration,mathematical absorber reflection suppression(MARS)technique is proposed to filter the antenna received signal,separate and filter the multipath interference components in the signal,and then reduce the multipath effect in the measurement environment.Relevant formulas are derived and the effect of the technique is verified in the antenna planar near-field measurement system.In the experiment,corner reflectors distributed around the AUT is used as the reflection resources.The results show that this method can effectively reduce the influence of multipath effect in the measurement environment,and the average gain error in the maximum radiation direction of the AUT is less than 0.1dB,which improves the measurement accuracy of the antenna.