基于近程目标探测雷达的关键技术研究

【作者】 段光生；

【导师】 朱晓华；

【作者基本信息】 南京理工大学 ， 通信与信息系统， 2008， 硕士

【摘要】 超近程主动防御系统是反导体系的最后一道屏障,近程目标探测雷达是主动防御系统中的核心技术,研究近程目标探测雷达具有重要的军事意义。寻找近程目标探测雷达的最佳信号波形,抑制雷达目标的角闪烁,以提高雷达目标命中率,改善测角精度,是本文需要解决的主要问题。本文针对以上两个问题展开研究,详细探讨了几种信号应用在近程目标探测雷达中的性能,雷达扩展目标的角闪烁建模、角闪烁抑制技术以及角闪烁背景下的雷达目标跟踪等方面的理论和应用技术,主要内容如下:本文首先论述了研究的背景及意义,国内外研究的历史和现状及本文所做的主要工作;接着研究了近程目标探测雷达的波形设计方案,讨论了巴克码,伪随机码和互补码在近程目标探测雷达中的应用,仿真结果表明格勒互补码的性能最佳;然后研究了角闪烁的建模技术,对雷达扩展目标的确定性模型和统计型模型分别进行了建模和仿真分析。最后研究了角闪烁的抑制方法,一方面研究了捷变频雷达中抑制角闪烁,改善测角精度的理论方法,讨论了频率捷变抑制角闪烁的原理和技术,研究了采用幅度加权的方法抑制角闪烁,仿真结果表明基于幅度平方加权的捷变频技术可以最有效的抑制角闪烁;另一方面研究了基于粒子滤波器和扩展卡尔曼滤波器对目标角闪烁噪声抑制的性能,仿真结果表明粒子滤波的性能要优于扩展卡尔曼滤波。更多还原

【Abstract】 Active defense system is important in military. Near range target detection radar is the key technology of active defense system. To find the best waveform of the near range target detection radar and to suppress glint, improve angle measuring accuracy and improve guidance radar’s tracking and guiding accuracy, is the main problem to solve in this paper. The theory and some applicational technologies about near range target detection radar, including kinds of waveform designing, glint simulation, glint suppressing, target tracking with glint, are discussed in detail. The main work is outlined as follows:Firstly, the background, significance, history and status in short-range active defense system and the main work of this paper are introduced. As followed, the waveform design of near range target detection radar are studied in detail. Computer simulation verifies the performance of Golay code is the best. And then, the glint simulation is studied. the feasibility simulation using multiple scattering centers target model and statistical model is studied in detail. Finally, the method of glint suppressing is discussed. In one side, the theories and technologies of suppressing glint measuring accuracy for frequency agility radar are studied. Frequency agility technique can get rid of the relativity between border upon echo pulses, and angle glint is suppressed effectively. Then, a study on glint suppressing algorithm is performed based on amplitude weighting. Performance comparison under different amplitude weighting is made and the optimization of square amplitude weighting is proved. Another side, the study is performed on the application of particle filter and EKF for tracking with glint noise. The simulation result shows that the particle filter algorithm can suppress glint and solve non-Gaussian maneuver targeting tracking problem primely.更多还原