【作者】 潘晓博；

【导师】 张弓；

【作者基本信息】 南京航空航天大学 ， 电路与系统， 2005， 硕士

【摘要】 雷达的主要目的就是在存在干扰的背景中检测出有用目标,杂波对雷达检测性能的影响一直是雷达设计中不可回避的重要问题之一。杂波跟踪技术通过对特征杂波进行跟踪和定位,为恒虚警检测算法的选择提供依据,对改善雷达的检测性能,提高我国雷达的技术水平具有积极的意义。本课题结合航空科学基金“基于杂波跟踪融合的恒虚警检测专家系统研究”,研究分形技术和snake算法在杂波跟踪中应用,设计了相应的算法,通过分析真实数据和仿真数据验证了算法的有效性。本文介绍了国内外雷达检测的智能化、综合化研究进展情况,以及杂波跟踪技术的研究现状。分析了杂波的基本特征、杂波模型,研究了机载PD雷达杂波的仿真算法,实现了几种常见的杂波分布统计特性相应的杂波样本。并研究了特征杂波在检测域中的位置与雷达系统参数的关系;介绍了分形技术的发展和基本的Mandelbrot分形理论,分析了杂波的分形特征,研究了多重分形技术在杂波跟踪中的应用。以单点分形维数和区域分形指数随q值的变化程度为标准,确定了多重分形最优高阶矩数,结合PD雷达的杂波特性和多重分形算法,实现了主瓣杂波跟踪;研究了贪婪snake方法在杂波跟踪中的应用,介绍了snake基本模型的能量函数,并分析几种常用的snake模型的离散能量函数。针对杂波数据的强度起伏大的特点,提出了结合sobel算子和梯度算子的预处理方法,满足了贪婪snake外部能量的收敛要求,在真实数据和仿真样本条件下,分析了初始边框间隔对跟踪精度、运行时间的影响,以及不同分布、不同强度杂波样本的跟踪效果,为后续的工作打下基础。对本文的工作进行了总结,指出了下一步研究的问题。更多还原

【Abstract】 The main function of radar is target detection in the background clutter.The effect of clutter to the automatically detecting system is one of most important problem which could not ignore in the radar design. The clutter tracking technic supply the warrant for the choice of CFAR detecting algorithm by the character clutter tracking and localization. It has a active significance to improve the detecting performance of radar. Combined with the Foundation Research (Avigation science fund 04D52032)”study on CFAR detecting expert system base on clutter tracking”.This paper study the fractal technic and snake algorithm on the application of clutter tracking. It proved that the method was effective by the algorithm which adapt to the real and simulant clutter data.This paper introduce the intelligentized and integrative research on the radar detecting in and abroad.It also introduce the clutter tracking latterly.This paper analyze the basic character clutter and the clutter model. It study a simulation algorithm of airborne PD radar and carry out the the clutter sample of different distributing, The location of character clutter in detecting and the relation of radar system parameter are research in this paper.This paper introduces principle of fractal and the Mandelbrot fractal theory.It analyze the fractal character and study the mltifractal for the clutter tracking. In according to the rage which follow the q on point fractal dimension and region fractal exponent .We confirm the prepreerence multifractal high moment, Combining the clutter feature of PD radar and novel multifractal approach, The mainlobe clutter tracking come true.This paper study the greedy snake algorithms for the clutter tracking.It introduce the energy function of basic snake model and analyze the different kind of snake discrete energy function.It study on the method which use the pretreatment combining the sobel and grads arithmetic operators.The astringency of snake external energy was satisfied. This paper analyze the influence of tracking precision and running time for the preliminary border width, It also study on the tracking effect of different distributing and intensity.It is important to the next work.The tag of this paper makes a summary of research and gives expectation on research future.更多还原