基于功率测量的单天线测向技术的研究
发布时间：2019-01-23 18:12
【摘要】：无线电测向是根据电磁波传播特性及天线辐射的方向性,对天线系统接收到的来波信号进行处理以达到估计信号源的到达方向(Direction of Arrival,DOA)的过程。DOA估计一直是信号处理中研究的热点,其中具备高分辨力的多重信号分类(Multiple Signal Classification,MUSIC)算法更是一经提出便备受关注。但由于MUSIC需要多接收天线、多通道接收机且本身算法较复杂,需要不断地进行谱搜索来实现DOA估计,这使得其在实际运用中受到一定限制。单天线测向是除阵列天线测向之外的一种便捷的无线电测向技术。本文研究基于功率测量的单天线测向方法,将天线功率方向性建模为有限项加权复指数之和,利用接收天线指向不同方向时接收到的信号功率数据,将问题转化为参数谱估计问题,进而利用零化滤波器(Annihilating Filter)方法求得波达方向的估计。针对一个和多个不相关远场来波信号源的DOA估计,主要进行了以下研究工作:1.在理想条件下和噪声情形中,分别通过仿真验证基于功率测量的单天线测向方法对一个和多个来波信号方向估计的效果。2.通过仿真结果分析影响基于功率测量的单天线测向方法对DOA估计效果的因素,包括噪声相对强度、天线波束宽度、功率样本数、信号的到达角度间隔及信号源个数等。3.在已有方法的基础之上给出一种改进的测向方案,并通过仿真比较改进的方法和原方法的估计性能。4.实际搭建基于该方法的信号发射和接收环境,将研究的方法运用于实测数据的处理,验证该测向方法的实际可行性。
[Abstract]:Radio direction finding is based on the characteristics of electromagnetic wave propagation and the directionality of antenna radiation, processing the incoming wave signal received by antenna system in order to estimate the direction of arrival of the signal source (Direction of Arrival, The process of DOA). DOA estimation has been a hot topic in signal processing, and the high resolution multi-signal classification (Multiple Signal Classification,MUSIC) algorithm has attracted much attention once it has been proposed. However, because MUSIC needs multi-receiving antennas and multi-channel receiver and its own algorithm is complex, it needs to continuously carry out spectrum search to realize DOA estimation, which makes it limited in practical application. Single antenna direction finding is a convenient radio direction finding technique except array antenna. In this paper, the single antenna direction-finding method based on power measurement is studied. The antenna power directivity is modeled as the sum of finite weighted complex exponents, and the received signal power data is obtained when the receiving antenna points in different directions. The problem is transformed into the parameter spectrum estimation problem, and then the estimation of the DOA is obtained by using the (Annihilating Filter) method of the zero filter. For the DOA estimation of one or more uncorrelated far field signal sources, the following research work is done: 1. In the ideal condition and the noise case, the effect of the single antenna direction finding method based on power measurement on the direction estimation of one or more incoming signals is verified by simulation. 2. Through the simulation results, the factors that affect the DOA estimation effect of single antenna direction finding method based on power measurement are analyzed, including relative intensity of noise, antenna beam width, power sample number, signal arrival angle interval and number of signal sources, etc. Based on the existing methods, an improved direction finding scheme is presented, and the performance of the improved method and the original method is compared by simulation. 4. The signal transmitting and receiving environment based on this method is built in practice. The research method is applied to the processing of the measured data to verify the feasibility of the direction finding method.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN820
本文编号：2414075
[Abstract]:Radio direction finding is based on the characteristics of electromagnetic wave propagation and the directionality of antenna radiation, processing the incoming wave signal received by antenna system in order to estimate the direction of arrival of the signal source (Direction of Arrival, The process of DOA). DOA estimation has been a hot topic in signal processing, and the high resolution multi-signal classification (Multiple Signal Classification,MUSIC) algorithm has attracted much attention once it has been proposed. However, because MUSIC needs multi-receiving antennas and multi-channel receiver and its own algorithm is complex, it needs to continuously carry out spectrum search to realize DOA estimation, which makes it limited in practical application. Single antenna direction finding is a convenient radio direction finding technique except array antenna. In this paper, the single antenna direction-finding method based on power measurement is studied. The antenna power directivity is modeled as the sum of finite weighted complex exponents, and the received signal power data is obtained when the receiving antenna points in different directions. The problem is transformed into the parameter spectrum estimation problem, and then the estimation of the DOA is obtained by using the (Annihilating Filter) method of the zero filter. For the DOA estimation of one or more uncorrelated far field signal sources, the following research work is done: 1. In the ideal condition and the noise case, the effect of the single antenna direction finding method based on power measurement on the direction estimation of one or more incoming signals is verified by simulation. 2. Through the simulation results, the factors that affect the DOA estimation effect of single antenna direction finding method based on power measurement are analyzed, including relative intensity of noise, antenna beam width, power sample number, signal arrival angle interval and number of signal sources, etc. Based on the existing methods, an improved direction finding scheme is presented, and the performance of the improved method and the original method is compared by simulation. 4. The signal transmitting and receiving environment based on this method is built in practice. The research method is applied to the processing of the measured data to verify the feasibility of the direction finding method.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN820
【参考文献】
相关硕士学位论文 前2条
1 蒲刚;平行基线解模糊干涉仪测向算法及实现[D];电子科技大学;2013年
2 常城;基于均匀圆阵的DOA估计及其FPGA实现[D];电子科技大学;2013年
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