【作者】 李旭朝；

【导师】 田红心；

【作者基本信息】 西安电子科技大学 ， 通信与信息系统， 2008， 硕士

【摘要】 随着GPS全球定位系统在军事和民用领域越来越广泛的应用,它容易被干扰的问题显得日益严重。由于干扰的影响,GPS接收机性能变得不稳定甚至完全失效。为了使GPS接收机能在干扰环境下正常工作,进行抗干扰GPS接收机的研究就势在必行。本文在阐述GPS的工作原理、信号格式、射频干扰的影响以及自适应天线基本原理的基础上,研究了天线阵抗干扰问题,取得成果如下:1.提出了基于自适应天线阵的GPS抗干扰接收机的方案;2.从最基本的阵元数目确定着手,讨论了阵列形式选择,详细分析了直线阵、矩形阵和圆形阵三种阵列形式的特点,选定了适合于所提出抗干扰方案的阵形;3.分别分析了DOA估计算法和抗干扰算法,将传统抗干扰算法应用到二维空间角度的零陷成形仿真中,并将传统的DOA估计算法推广到二维空间角度,对其进行了仿真,确定满足基于自适应天线的GPS抗干扰接收机方案的DOA估计算法和抗干扰算法;4.最后仿真了所提出的GPS抗干扰接收机方案的性能,得出了有益结论。更多还原

【Abstract】 As GPS receiver has been used in civil and military affair more and more widely. The main problem of GPS is easy to be jammed that is increasingly serious, thus the GPS receiver often works in unstable state or even can not work. For these reasons, it is very important to study the anti-jamming technology for GPS receiver.Based on the analysis of the work principles, signal characteristics, RF interference influence on GPS, and the adaptive antenna principles, the author studies the problem of anti-jamming and uses antenna array for it. The author’s researches involve four aspects as follows:1. The scheme of GPS anti-jamming receiver, which is based on adaptive antenna, is put forward.2. Commence on ensuring the number of antennas in adaptive array, the thesis discusses how to choose the shape of adaptive array, analyzes the features of the line, the rectangle and the circle these three forms array concretely, and finally takes the circle array as our chosen shape.3. The algorithms of direction of arrival estimation and of the anti-jamming are studied and analyzed separately. The traditional estimation algorithm of direction of arrival and the anti-jamming algorithm are applied and extended to two-dimensional angle, then simulated. The algorithms, which contain DOA estimation and anti-jamming that satisfy the anti-jamming GPS receiver scheme based on adaptive array, are choose through simulation by computer.4. The performance of anti-jamming GPS receiver is evaluated and a satisfactory conclusion is drawn.更多还原