低截获概率信号测向技术

【作者】 王建伟；

【导师】 陆锦辉；

【作者基本信息】 南京理工大学 ， 通信与信息系统， 2008， 硕士

【摘要】 低截获概率信号的出现对于电子对抗提出了新的挑战。对低截获概率信号辐射源的准确侦察定位对在电子对抗有中重要的意义,该课题已经成为雷达通信领域研究的热点问题之一。本文首先分析了常用的低截获概率信号的特点。经过分析,低截获概率信号大都具有低峰值功率和宽频带的特点。因此,完成对低截获概率信号的测向定位方案必须能够处理低信噪比信号和宽带信号。本文正是从这点入手,通过相关处理增大信号信噪比,并且保留信号的相位信息。随后详细讨论了传统空间谱估计方法。由于传统空间谱估计算法是基于窄带信号的,而且此类算法不能处理相干信号,因此为了进行有效估计,必须研究基于相干宽带信号的处理方法。最后本文讨论了多种宽带相干信号的DOA测向定位方案(CSM)。此方案建立在阵列信号处理的基础上,不仅可以较为精确的估计低信噪比和宽带信号,而且可以有效的处理相干信号。本文所提出的算法均通过计算机仿真进行验证和比较,并由此讨论了影响定位精度的因素。更多还原

【Abstract】 The present of LPI signals brings a new challenge to electronic warfare. The accurate location of source of LPI signals has significant meaning for it. This subject has become one of the hottest issues in radar and communication field.In this paper, the characteristics of common LPI signals are firstly discussed. Most of the LPI signals are low-powered and widebanded. Therefore, the scheme of location should be able to deal with signals with low SNR and wideband, the research starts with enhancing the SNR by using the correlation, and reserving the phase information. Then, several ways of traditional DOA estimation are discussed in detail. Because traditional DOA estimation can only deal with narrowbanded signals and these ways can not deal with coherent signals, so the sheme should be able to deal with coherent signals and widebanded signals in order to estimate accurately. At last, several ways of widebanded DOA estimation are discussed. Not only the low SNR and wideband signals can be estimated accurately, but the coherent signals can also be processed by this sheme.The algorithms in this paper are all simulated and compared. The factors that have impact on accuracy of DOA are also discussed.更多还原