基于软件无线电的天线阵方向图测量

本文设计了一种基于软件无线电的天线阵方向图测量实验。在1.5GHz频段下，手动搭建了一个以单极天线为单元的4元天线阵，并使用两台软件无线电设备USRP 2920分别连接单极天线和天线阵列以作为发射机和接收机。实验将发射机围绕接收机作圆周运动，记录发射天线所在方位角与接收信号的幅值强弱，在极坐标系内即可绘制出天线阵列在水平面内的实测方向图。本实验的测试结果与计算结果基本一致。

Measuring the Pattern of Antenna Array Based on Software Defined Radio

In this paper, an experiment of measuring antenna array pattern based on software-defined radio is designed. At the frequency of 1.5GHz, a 4-element antenna array with monopole antenna as the unit is built manually, and two software radio equipments USRP 2920 are used as the transmitter and receiver. The transmitter is connected with a monopole antenna and the receiver is connected with the antenna array. The azimuth angle of the transmitter and the amplitude of the received signal are recorded when circling the transmitter around the receiver. The measured data could be drown as a curve at the polar coordinate system, which indicates the characteristics of the manually built antenna array. The experimental results are basically consistent with the simulating results.