cw脉冲数字跟踪滤波技术的研究-信号与信息处理专业毕业论文.docx

哈尔滨工程人学硕士学位论文
Abstract
In modern marine military defence mercial ocean development, signal processing is signal processing,one of the methods is signal—filter,that is,distilling useful information from the signal that received to
enhance the signal—noise to the CW pulse signal with changing carrier
wave mon filter cannot achieve narrowband filter,whereas broadband filter cannot reach the request of the signal·noise ratio.
This anizes discussion around the CW pulse main
problem is how to search and track the CW pulse signal with changing carrier wave the paper mainly use two means to design the system of searching and tracking signal,and to simulate the main work in
this paper includes:
First of expatiate the elements of swept emphasis is put on tWO ways———narrowband swept method and broadband swept method,pare the performance we indicate the advantages,disadvantages and working condition ofeach method.
elements of adaptive filter and LMS arithmetic were introduced in this adaptive signal processing,the elements of adaptive noise elimination and adaptive linear enhancer were also introduced and adopted in this
paper.
At last we simulate these two systems pare these two methods to
draw conclusion.
Key words:CW pulse;search;track;adaptive filter;swept method
哈尔滨工程大学学位论文原创性声明
本人郑重声明:本论文的所有工作,是在导师的指导下, 由作者本人独立完成的。有关观点、方法、数据和文献等的引用已在文中指出,并与参考文献相对应。除文中已经注明引用的内容外,本论文不包含任何其他个人或集体已经公开发表的作品成果。对本文的研究做出贡献的个人和集体,均已在文中以明确的方式标明。本人完全意识到本声明的法律结果由本人承担。
作者(签字):型
日 期:Ⅺ于年猬/日
哈尔滨工程大学硕士学位论文
第1章绪论

从20世纪50年代开始,随着信息论、信号检测理论和计算机技术的发展,水声信号处理理论和技术也得到了长足的进步,同时,对于处理的水声信号的要求也就越来越高。
通常在信号处理中,信号不可避免地受到各种原因产生的高频低频干扰, 为了检测被测信号,常常要用到滤波器。如在水声测量中,由于载体颠簸等原因会产生随机的相当于基频的高低频干扰,信道起伏和载体的自噪声等, 这些干扰和噪声使接收信噪比减小。另外,在某些测量中,载体速度变化上下限差值很大,对应的信号频率差别就会很大,对于这种信号采用宽带滤波器,信噪比难以保证,必然会影响测量精度。在水声领域的某些测量情况下, 信号频率范围很大,但在短时间内中心频率变化较慢,且带宽很窄,如多普勒速度计程仪。对于大尺度多普勒计程仪在测量时由于深度很大,致使信噪比将会很低,影响测频精度。为了提