【作者】 胡园；

【导师】 惠俊英；

【作者基本信息】 哈尔滨工程大学 ， 水声工程， 2008， 硕士

【摘要】 在现代浅海作战环境下,低成本的反潜武器将发挥越来越大的作用。而赋予它自导功能,就使其跨入了精确自导武器的殿堂。本文主要对低成本自导反潜武器(LCHAW——Low Cost Homing ASW Weapon)的声自导系统进行研究。主动声自导系统采用主动式探测,通过对接收到的回波信号进行处理来探测目标,并进行目标参量估计,指令装置根据接收机提供的有关信息,输出操纵主动声自导系统的指令,跟踪目标。主动自导系统工作时,混响是其主要干扰。随着各种现代信号处理方法的出现,出现了各种各样的抗混响方法,但对于主动声自导系统并不适用。本文提出了一种适合主动声自导系统的现代信号处理方法,回波信号通过自适应Notch滤波器滤除噪声,并对其输出实时计算出归一化权系数,归一化之后混响是平稳的,这大大提高了自导系统对目标的检测能力。此抗混响技术简单、方便、可靠,很好的实现了混响的平稳化。在目标参数估计方面,采用两个基于LMS算法的自适应Notch滤波器即可完成信号检测、目标的距离估计、方位估计和频率估计等各项任务,具有很高的计算效率。从海试和湖试数据的处理中可以得出结论,该信号处理技术简单、方便、有效,很好的实现了抗混响。从数据处理结果看,目标参数估计也在误差范围之内,实现了主动声自导系统所要求的功能和指标。更多还原

【Abstract】 In shallow water, low cost anti-submarine weapon will play more and more important role in modern combat. Entrusted with the homing function, it will be promoted to be one kind of precise homing weapon. This dissertation mainly studies the homing system of the low cost homing anti-submarine weapon.The homing system of LCHAW (Low Cost Homing ASW Weapon) uses active exploration mode. It can detect the target by processing the received echo signals, and target parameters will also be estimated. The instruction installation outputs the LCHAW’s manipulation instructions according to the relevant information provided by receiver, and the target will be tracked. When the active homing system works, the reverberation is the main interference. With the development of signal processing technique, it presented a wide range of anti-reverberation methods, but they don’t suit the LCHAW.A modern signal processing technique is proposed in this dissertation which suits LCHAW. The noise added to echo signal is filtered by adaptive Notch filter, and the normalized weight coefficients are calculated real time. The reverberation is suppressed which is advantaged to improve the ability of detection for homing system. The anti-reverberation technology is simple, convenient and reliable. In the aspect of target parameters estimation, the signal detection, target distance estimation, the position estimate and the frequency estimate are realized by using two adaptive Notch filters which base on the LMS (least mean square) arithmetic.According to the results of the real data processing, it is concluded that the signal processing technology is simple, convenient and effective; the reverberation is well suppressed; and the functions and indicators of the LCHAW’s homing system are realized.更多还原