基于ESPRIT的分布式相控阵列无源定位算法研究

发布时间：2018-07-22 20:00

【摘要】：多平台下无源定位隐蔽性好,战场生存能力强,受到该领域内研究者们的青睐。但传统的无源定位方式已无法满足人们对目标定位精度的要求,特别是目标距离较远,环境恶劣时,定位精度很低。提高无源定位在恶劣条件下的定位精度已成为该领域的研究热点。针对分布式相控阵列,本文深入研究了基于ESPRIT(estimating signal parameter via rotational invariance techniques)的无源定位技术,提出基于ESPRTI的目标定位方法,该方法可以同时对多个目标进行定位,且定位精度较高。论文的主要工作包括:1.提出一种基于ESPRIT的分布式相控阵列单目标定位方法。推导了单目标定位的搜索谱函数,给出了ESPRIT单目标定位方法的实现流程,分析了信噪比、布阵半径、目标远近及阵元个数对目标定位精度的影响,实验结果表明:信噪比越大、布阵半径越大、目标距离越近、阵元数越多定位越精确。对比了ESPRIT单目标定位与纯角度定位两种方法,仿真结果表明:低信噪比下,本文所提方法能获得更高的定位精度。2.提出一种基于ESPRIT的分布式相控阵列多目标搜索定位方法。推导了多目标定位的搜索谱函数,给出了基于ESPRIT的多目标搜索定位方法的实现流程,分析了信噪比、布阵半径、目标远近及阵元个数对多目标定位精度的影响,得到与单目标定位相同的结论,进一步给出了目标个数对定位精度的影响。3.研究一种基于ESPRIT的多目标匹配定位方法。将多个目标通过角度信息匹配进行分离,并将多目标定位转换为单目标定位,在减小计算量的同时也提高定位精度。仿真结果表明:多目标匹配定位比多目标搜索定位的精度更高、时效性更好。
[Abstract]:Passive location in multi-platform has good concealment and strong battlefield survivability, so it is favored by researchers in this field. However, the traditional passive location method can not meet the requirements of target positioning accuracy, especially when the target is far away, and the location accuracy is very low when the environment is bad. Improving the accuracy of passive location under bad conditions has become a hotspot in this field. For distributed phased array, the passive location technology based on Esprit (estimating signal parameter via rotational invariance techniques) is studied in this paper, and a target localization method based on Esprit is proposed. This method can locate multiple targets simultaneously, and the accuracy is high. The main work of the thesis includes 1: 1. A single target location method for distributed phased array based on Esprit is proposed. The search spectrum function of single target location is derived, and the realization flow of Esprit single target localization method is given. The influence of SNR, array radius, target distance and number of array elements on target localization accuracy is analyzed. The experimental results show that the greater the SNR is, the greater the SNR is. The larger the array radius is, the closer the target is, and the more the number of elements is, the more accurate the location is. The Esprit single target localization method and pure angle positioning method are compared. The simulation results show that the proposed method can achieve a higher accuracy of location at low SNR. This paper presents an Esprit-based multi-target search and location method for distributed phased array columns. The search spectrum function of multi-target location is derived, and the realization flow of multi-target search and localization method based on Esprit is given. The influence of SNR, array radius, target distance and number of array elements on the accuracy of multi-target location is analyzed. The same conclusion as that of single target location is obtained, and the effect of the number of targets on the positioning accuracy is further given. A multi-target matching localization method based on Esprit is studied. The multiple targets are separated by angle information matching, and the multi-target positioning is converted to single target location, which can reduce the computation cost and improve the positioning accuracy. The simulation results show that the accuracy of multi-target matching localization is higher than that of multi-target search location, and the timeliness is better.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN95

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