基于CMT的高动态GPS抗干扰算法研究

发布时间：2017-12-28 14:08

  本文关键词：基于CMT的高动态GPS抗干扰算法研究　出处：《中国民航大学》2014年硕士论文　论文类型：学位论文

  更多相关文章： 全球定位系统 高动态 自适应阵列 干扰抑制 协方差矩阵锥化

【摘要】：随着全球定位系统(Global Positioning System,简称GPS)在军事和国民经济等领域的广泛应用,GPS信号容易受到干扰的问题显得日益严重。尤其在高动态环境下,干扰相对于GPS接收机的来向随时间变化很快,常规的自适应干扰抑制方法形成的零陷很窄,干扰很容易移出天线波束形成零陷的位置而无法被抑制掉,导致GPS接收机性能明显下降甚至完全失效。为了保证高动态环境下接收机的正常工作,进行高动态卫星导航抗干扰技术的研究具有重要意义。本项目主要研究了基于协方差矩阵锥化(covariance matrix taper,CMT)思想的高动态GPS自适应抗干扰方法。首先,研究和分析了Mailloux和Zatman两种经典的CMT加宽零陷方法,通过推导其扩展矩阵,讨论了它们在任意阵列模型下的适用性。分析结果表明,Mailloux方法可适用于任意阵列,但是需要知道干扰的来向信息,而Zatman方法仅适用于线阵。其次,从统计模型和实际接收机运动状态的角度出发,分析出高动态下干扰来向的角度变化更符合Laplace分布模型,从而提出了一种基于Laplace的最小功率加宽零陷抗干扰算法。新方法可以加宽干扰处的零陷宽度,不需要知道卫星以及干扰信号的来向信息,适用于任意线阵以及圆阵阵列,并且不会改变协方差矩阵噪声项的贡献,零陷宽度容易控制。最后,本文将Laplace加宽零陷方法推广到空时二维自适应阵列处理中,推导证明了该方法在线阵、圆阵以及任意阵列模型下的适用性。结果表明,对于空时域线阵和圆阵阵列,扩展矩阵同样不需要知道干扰的来向信息,同时不会改变噪声项的贡献。基于上述方法进行仿真实验和实测数据验证,结果表明了新方法的有效性和实用性,具有一定的应用价值。
[Abstract]:With the wide application of Global Positioning System (GPS) in military and national economy, the problem of GPS signal being easily interfered is becoming more and more serious. Especially in high dynamic environment, interference relative to the GPS receiver to change rapidly over time, the conventional adaptive interference nulling suppression method which is easily removed from the narrow interference nulling beamforming antenna position cannot be suppressed, leading to the GPS receiver performance is obviously decreased or even complete failure. In order to ensure the normal work of the receiver in high dynamic environment, it is of great significance to study the anti-jamming technology of high dynamic satellite navigation. This project mainly studies the high dynamic GPS Adaptive Anti-jamming method based on covariance matrix taper (CMT). First, two classical CMT widening nulling methods, Mailloux and Zatman, are studied and analyzed, and their applicability is discussed based on their extended matrix. The analysis results show that the Mailloux method can be applied to any array, but it needs to know the incoming information of the interference, and the Zatman method is only applicable to the linear array. Secondly, from the perspective of statistical model and actual receiver motion state, it is analyzed that the angle variation of high dynamic interference is more consistent with the Laplace distribution model, and a Laplace based minimum power widening nulling anti-jamming algorithm is proposed. The new method can widen the width of the interference area, do not need to know the information from satellites and interference signals, and apply to any linear array and circular array array, and it will not change the contribution of the noise matrix of the covariance matrix, and the width of the nulling is easy to control. Finally, the Laplace widening null method is extended to space-time adaptive array processing. The derivation proves the applicability of the proposed method in online array, circular array and arbitrary array model. The results show that for the space time linear array and the circular array array, the extended matrix does not need to know the incoming information of the interference, and does not change the contribution of the noise term. The simulation experiment and the measured data are verified based on the above method. The results show that the new method is effective and practical, and has certain application value.
【学位授予单位】：中国民航大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：P228.4;TN973

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