自适应调零天线扩频接收机干扰技术研究

发布时间：2018-04-28 19:42

本文选题：自适应调零天线 + MVDR算法　；参考：《西安电子科技大学》2014年硕士论文

【摘要】：通信对抗是保护己方无线通信系统工作正常、削弱或破坏对方无线通信系统的使用效能所采取的措施和行动。通信干扰和抗干扰技术是通信对抗的重要研究方向。自适应调零天线可以有效削弱来自干扰方向的能量,从而改善信号干扰功率比,是一种提高接收机抗干扰能力的有效方法;而对自适应调零天线进行有效干扰可以显著降低这种带有自适应调零天线抗干扰技术的接收机的抗干扰效能。本文研究针对具有自适应调零天线的接收机的高效的干扰样式和干扰策略。主要研究内容如下:1、对自适应调零天线进行了理论分析和仿真,重点对MVDR(最小方差无失真响应)自适应算法和MVDR的两种递推实现算法(LMS、RLS)进行了详细的推导。2、给出了一种改进的连续可变步长LMS递推实现算法。该方法根据接收信号的平均功率来连续调整步进因子,从而达到兼顾收敛速度和稳态误差性能的目的。给出了连续可变步进因子的计算公式。在多种干扰方式下的仿真结果表明,使用这种连续可变步进因子比固定步进因子的LMS算法可以同时具有较快的收敛速度和较好的稳态误差性能。3、研究了基于chirplet原子干扰样式对应用LMS算法递推实现的自适应调零天线系统的影响。给出了带有自适应调零天线的扩频接收机干扰仿真模型。仿真结果表明:对于连续波干扰样式,chirplet原子干扰和高斯白噪声干扰的性能基本相同;对于闪烁干扰样式,chirplet原子的干扰持续时间在总时间中所占的比例越小,则干扰性能越好;对于混合式干扰样式,如果chirplet原子的平均功率相等,那么干扰持续时间在总时间中所占的比例越小,则干扰性能越好,如果三个chirplet原子的平均功率是不相等的,而且把强功率干扰推迟发送,那么推迟发送时间越长,干扰性能越好。
[Abstract]:Communication countermeasures are measures and actions taken to protect our wireless communication system from working normally and to weaken or destroy the performance of the other wireless communication system. Communication interference and anti-jamming technology are the important research direction of communication countermeasure. Adaptive zeroing antenna can effectively reduce the energy from the interference direction and improve the signal interference power ratio. It is an effective method to improve the anti-jamming ability of the receiver. The effective interference of the adaptive zero adjusting antenna can significantly reduce the anti-jamming efficiency of the receiver with the adaptive zero adjusting antenna anti-jamming technology. In this paper, efficient interference patterns and jamming strategies for receivers with adaptive zero-adjusting antennas are studied. The main research contents are as follows: 1. The adaptive zero adjusting antenna is analyzed and simulated theoretically. In this paper, the adaptive algorithm of minimum variance distortionless response (MVDR) and two recursive realization algorithms of MVDR (LMS / RLSs) are derived in detail, and an improved continuous variable step size (LMS) recursive realization algorithm is presented. The step factor is continuously adjusted according to the average power of the received signal, so that the convergence rate and the steady-state error performance can be taken into account. The calculation formula of continuous variable step factor is given. The simulation results under various jamming modes show that, The LMS algorithm with continuous variable step factor can have faster convergence speed and better steady-state error performance than that with fixed step factor at the same time. The recursive implementation of LMS algorithm based on chirplet atomic interference pattern is studied. The effect of adaptive zero-adjusting antenna system. The interference simulation model of spread spectrum receiver with adaptive zero-adjusting antenna is presented. The simulation results show that the performance of the continuous wave interference mode chirplet atomic interference and the Gao Si white noise interference is basically the same, and the smaller the proportion of the interference duration to the total time, the better the interference performance. For hybrid interference patterns, if the average power of the chirplet atoms is equal, the smaller the proportion of the interference duration in the total time, the better the interference performance, if the average power of the three chirplet atoms is not equal, The longer the delay time, the better the jamming performance.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN975

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