球面多探头天线近场测试系统校准方法研究  

Study on the calibration method of spherical multi-probe antenna near-field measurement system

作　　者：胡楚锋[1] 郭丽芳[1,2] 李南京[1] 陈卫军[1] 郭淑霞[1] 

机构地区：[1]西北工业大学无人机特种技术重点实验室,西安710065 [2]西北工业大学电子信息学院,西安710072

出　　处：《仪器仪表学报》2017年第5期1061-1070,共10页Chinese Journal of Scientific Instrument

基　　金：国家自然科学基金(61371023;61571368)项目资助

摘　　要：球面多探头天线近场测试系统具有测试速度快,可获取待测天线的近场三维数据等优点。然而,多探头形成了多个测试通道,各通道不同的幅度和相位特性将会影响近场测试精度。针对各通道间的不一致性,首先对多探头系统进行机械校准,降低探头角度和位置误差;然后通过测量球面中心到每个探头的辐射信号进行电校准;仿真分析了系统误差和环境因素引起的幅相波动对近场数据外推远场方向图的影响。通过构建半球面多探头天线近场测试系统进行实验验证,结果表明了机械校准和电校准技术的有效性。将校准后的近场数据外推得到远场方向图,通过与远场测量方向图进行对比,验证了幅相误差对外推远场方向图的影响。Spherical multi-probe antenna near-field measurement system has the advantages of fast test speed and being able to acquire the three-dimensional near-field data of the antenna to be tested. However, multiple probes form multiple channels, and different amplitude and phase characteristics of various channels will affect near-field measurement accuracy. In order to eliminate the channel inconsistency, mechanical calibration of the multi-probe system is performed first, which reduces the angle and position errors of the probe. Then electrical calibration is performed through measuring the radiation signal from the center of sphere to each probe. Next, the influence of amplitude and phase errors caused by system errors and environment factors on the extrapolation of far-field radiation pattern from near-field data is simulated and analyzed. A semi-spherical muhi-probe antenna near-field measurement system was built, and verification experiment was conducted. The results indicate the effectiveness of mechanical calibration and electrical calibration techniques. The calibrated near-field data was extrapolated to obtain far-field radiation pattern, and the obtained radiation pattern was compared with the measured far-field radiation pattern. The comparison resuh verifies influence of amplitude and phase errors on extrapolated far-field radiation pattern.

关 键 词：天线近场测试 球面多探头系统 校准 幅相误差 外推 

分 类 号：TN82[电子电信—信息与通信工程] TH71[机械工程—测试计量技术及仪器]