一维天线阵列DOA估计实验系统设计与实现

Design and Realization of DOA Estimation Experimental System Using Linear Antennas Array

设计了一套四阵元线阵DOA估计实验系统用于雷达对抗等课程实验。系统主要由宽带平面螺旋天线、四通道软件无线电接收机USRP-2955和数据处理计算机组成。平面螺旋天线放置在俯仰可调的一维支架上,可实现基于均匀或稀疏阵列的信号接收;计算机控制USRP实现四通道同步下变频及IQ数据采集。在微波暗室,利用标准增益喇叭天线发射信号,采用MUSIC超分辨算法实现了信号的正确估计。验证了提出的稀疏阵列原子范数最小化无网格和无监督深度学习等新理论、新方法DOA估计的可行性,提高了测角精度;验证了提出的利用仿真数据训练网络实现基于深度学习DOA估计的方法。实验系统具有良好的实验指导意义和现实应用意义。

A set of 4-element linear array DOA estimation experimental system is designed in order to be applied to some experimental teaching courses,such as radar countermeasure course.The system is mainly composed of wideband planar spiral antennas,four channels software digital radio receiver(USRP-2955)and data processing computer.The planar spiral antennas are fixed on the one-dimensional stand with adjustable pitch,then the uniform linear array and the sparse linear array can be implemented.Meanwhile,the computer can control the USRP to realize the IQ data acquisition of 4-channel synchronous down conversion data.In the microwave dark room,the signal transmitted by the standard horn antenna is used as radiation source.Then the super-resolution algorithm,such as MUSIC algorithm,is used to complete correct DOA estimation.The feasibility of DOA estimation using the innovation theory and the novel method is verified,such as atomic norm minimization DOA estimation based on sparse linear array and unsupervised deep learning algorithm.The DOA estimation precision can be improved based on the proposed methods.Meanwhile,the validity of the proposed method of using simulation data to train the deep learning network to realize DOA estimation is confirmed.The experimental system has good experimental guiding significance and practical application value.