数字阵列天线测量技术研究

发布时间：2018-03-26 10:25

本文选题：数字阵列天线　切入点：天线方向图　出处：《南京理工大学》2015年硕士论文

【摘要】：随着射频集成电路技术和数字信号处理技术的迅速发展,数字阵列天线(DAA)受到越来越广泛的关注和研究,相比相控阵天线而言,数字阵列天线增加了数字波束形成(DBF)单元以及数字信号处理单元,拥有一般天线系统不具备的高增益、低副瓣、多波束扫描、多目标处理、自适应波束控制等特点。数字阵列天线性能指标测试是系统研制过程的重要环节。本文所涉及的集成数字阵列系统中天线单元、射频通道、A/D变换及预处理电路一体化连接,以致无可供直接连接的射频接口,无法用传统的天线测量系统来测量天线性能,由此本文提出了数字域天线参数测量方案,解决了基于DBF的天线参数测量问题。首先针对数字阵列天线系统的组成和特点,分析其不同于传统天线指标测试的原因,展开对数字阵列天线方向图、系统接收G/T值、EIRP值、波束赋形等天线参数进行测量方法研究。其次,开发了基于MFC的数字阵列天线系统自动化测量软件,主要功能包括：串口完成上位机与转台电机的实时通信、网口完成上位机远程操控安捷伦信号源与频谱仪、网口实现上位机与DBF电路板上的DSP模块实时数据交互、结合多线程技术与TeeChart Pro控件完成实时方向图的绘制。最后,针对960个阵元的数字阵列天线系统开展远场测量,对实测结果进行分析,验证测量方法的可行性与有效性,分析可能造成测量误差的因素,实测结果表明所研制的数字阵列天线基本满足系统指标要求。
[Abstract]:With the rapid development of RF integrated circuit technology and digital signal processing technology, digital array antenna (DAA) has received more and more attention and research, compared with phased array antenna, The digital array antenna adds the digital beamforming DBF unit as well as the digital signal processing unit. It has high gain, low sidelobe, multi-beam scanning, multi-target processing, which is not available in the general antenna system. Adaptive beam control and so on. The performance test of digital array antenna is an important link in the development of the system. The antenna unit in the integrated digital array system, RF channel A / D transform and preprocessing circuit are connected in this paper. As a result, there is no direct connection between RF interface and traditional antenna measurement system to measure antenna performance. Therefore, a digital antenna parameter measurement scheme is proposed in this paper. The problem of antenna parameter measurement based on DBF is solved. Firstly, according to the composition and characteristics of the digital array antenna system, the reasons why it is different from the traditional antenna index test are analyzed, and the pattern of the digital array antenna is developed, and the system receives the G / T value and the EIRP value. The measurement method of antenna parameters such as beamforming is studied. Secondly, the automatic measurement software of digital array antenna system based on MFC is developed. The main functions include: the serial port completes the real-time communication between host computer and turntable motor. The interface completes the remote control of Agilent signal source and spectrum spectrometer. The interface realizes the real-time data interaction between the upper computer and the DSP module on the DBF circuit board. Combined with the multithread technology and the TeeChart Pro control, the real-time direction diagram is drawn. Finally, the network interface realizes the real-time data exchange between the upper computer and the DSP module on the DBF circuit board. The far-field measurement of 960 array antenna system is carried out. The measured results are analyzed to verify the feasibility and validity of the measurement method, and the factors that may cause the measurement error are analyzed. The measured results show that the digital array antenna can meet the requirements of the system.
【学位授予单位】：南京理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN820

【引证文献】