双通道天线测量系统中频信号处理与控制模块设计

发布时间：2018-05-05 22:09

本文选题：双通道 + 天线测量　；参考：《电子科技大学》2016年硕士论文

【摘要】：随着天线理论的飞速发展,天线测量技术成为天线设计中至关重要的一个环节。双通道天线测量系统是一个平面近场天线测量系统,通过比较参考通道和测试通道信号的幅度和相位值,计算出天线的各类参数。在软件无线电技术快速发展的今天,一个专门为天线测量系统工作的全自动化、高精度、快速测量仪器,能够极大减少系统测量时间。本文针对双通道天线测量系统对于中频信号的测量需求,在FPGA硬件平台下设计了一个具有幅相测量功能的中频处理模块,并根据系统的基本测量流程,设计了一个用于天线测量的总体控制方案以提高测量效率。论文首先研究了中频信号的传统处理方案,指出该方案存在严重的频谱泄漏问题,无法应用于实际的天线测量系统中,进而提出将全相位算法与传统处理方法相结合的方案,通过原理分析和算法仿真两个方面验证了该方案对于频谱泄漏有良好的抑制效果。紧接着通过对全相位算法结构的研究,设计了全相位算法的硬件逻辑框架,并在中频硬件模块里实现了基于全相位的IQ正交解调算法。随后根据系统对于测量数据的缓存需要,设计了基于DDR3_SDRAM的数据存储方案,实现了测量数据的大容量缓存功能。最后通过对天线测量系统中各硬件模块的研究,设计了逐点触发频率列表、逐点触发单频多点、全轨迹触发频率列表、全轨迹触发单频多点四种扫频工作模式,在实际测量过程中,利用本文设计的控制功能模块,对上位机的控制命令进行解析,实现多种工作模式的切换。本文设计的基于双通道天线测量统的幅相测量模块,利用全相位算法提高了系统测量精度,而设计的多种扫频工作模式与系统中各硬件模块协同工作,极大的提高了测量效率。通过对各功能模块的实验,验证了本文设计方案的可行性。论文设计的中频幅相处理模块的性能指标达到了预期效果。
[Abstract]:With the rapid development of antenna theory, antenna measurement technology has become an important part of antenna design. The dual-channel antenna measurement system is a planar near-field antenna measurement system. By comparing the amplitude and phase of the reference channel signal and the test channel signal, the antenna parameters are calculated. With the rapid development of software radio technology, a fully automated, high-precision and fast measuring instrument dedicated to antenna measurement system can greatly reduce the measurement time of the system. In this paper, according to the requirement of if signal measurement in dual-channel antenna measurement system, an intermediate frequency processing module with the function of amplitude and phase measurement is designed under FPGA hardware platform, and according to the basic measurement flow of the system, An overall control scheme for antenna measurement is designed to improve measurement efficiency. Firstly, the paper studies the traditional processing scheme of intermediate frequency signal, points out that the scheme has serious spectrum leakage problem and can not be applied to the actual antenna measurement system, and then puts forward a scheme that combines all phase algorithm with the traditional processing method. The principle analysis and algorithm simulation show that the scheme has a good effect on spectrum leakage suppression. Then, through the research of the structure of the all-phase algorithm, the hardware logic framework of the all-phase algorithm is designed, and the IQ quadrature demodulation algorithm based on all phase is implemented in the if hardware module. Then, according to the need of the system to cache the measurement data, the data storage scheme based on DDR3_SDRAM is designed, and the large capacity cache function of the measurement data is realized. Finally, through the research of each hardware module in the antenna measurement system, four kinds of frequency sweep modes are designed, such as point by point trigger frequency list, point by point trigger single frequency multi-point, full trajectory trigger frequency list, all track trigger single frequency and multiple points. In the process of actual measurement, the control command of the upper computer is analyzed by using the control function module designed in this paper, and the switching of various working modes is realized. In this paper, the amplitude-phase measurement module based on dual-channel antenna measurement system is designed, which uses all-phase algorithm to improve the measurement accuracy of the system. The design of a variety of sweep-frequency working modes and the hardware modules in the system work together, greatly improve the measurement efficiency. The feasibility of the design is verified by the experiments of each functional module. The performance index of the if amplitude and phase processing module designed in this paper has achieved the expected effect.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TN820;TN911.7

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