Time delay estimation ( tde ) by using three - element linear array is an important problem in torpedo trajectory tracking system which ttacks target according to strictly geometrical position . it is the basis of measurement of target distance , bearings etc . the error of tde influences directly the accuracy of trajectory tracking . the more efforts have been made in order to acquire high accuracy estimation 三元直线阵的时延估计是鱼雷弹道测量系统中的一个重要课题，它依照严格的几何关系进行目标定位，是测量目标距离、方位等参数的主要依据，时延估计的精度直接影响弹道跟踪系统的精度，为提高时延估计精度人们进行了大量的研究和探索。
According to the presented sensor array form , the corresponding mathematical mode1 is established , and factors which influence tde accuracy have been analyzed in detail . the influence of tde accuracy to the estimation of tafget distance and bearings estimation is discussed also . meanwhile , the limitation of passive tracking methods and the difference between passive positioning and passive tracldng which based on three - element array are discussed 论文的主要研究工作有以下几个方面： 1 )针对三元直线阵的阵列形式，建立了相应的数学模型，对影响时延估计精度的因素进行了详尽的分析和研究，讨论了时延估计精度对目标距离和方位估计精度的影响，并讨论了三基元被动定位的局限性以及被动定位和被动跟踪的差别。
By using the processing method of sliding time window , the problem of the periodicity range ambiguity is solved . meanwhile , the problem of range ambiguity which is produced because the range of target is biger than the maximum range of radar is also solved by using this method . then , the pulse width parameter which is the most important in the parameters of fmicw is analyzed . the stricter restrict is given to ensure the range spectrum has only one beat frequency after signal processing . at last this thesis introduces the different signal processing methods of fmpcw and fmicw 同时利用该方法解决了fmpcw信号的由于目标距离超过雷达的最大单值测距范围而引起的距离模糊问题。然后对fmicw波形参数中最为重要的脉冲宽度进行了分析,给出了更为严格的约束条件,保证了信号处理后距离谱峰值的唯一性。最后,分别介绍了fmpcw和fmicw信号的不同处理方式,并对两者不同的时域滤波性能进行了比较,并对二者的差异进行了分析。
The main work is given as follows : the stepped - frequency waveform synthesizing the wideband signal , the synthetic range profile ( srp ) by ifft , the range resolution of stepped - frequency waveform , the effect of the radial velocity on the srp , the radial velocity compensation , ambiguity function , waveform design and stepped frequency sar imaging and so on 包括：频率步进波形合成超宽带信号分析， ifft方法获得目标一维距离像与距离分辨率分析，径向速度对目标距离像的影响、速度补偿、频率步进信号的模糊函数分析，以及频率步进波形照射下的合成孔径雷达成像、波形设计与系统设计。
Studied the cluster and background reduction algorithm and , proposed an enhanced adaptive step average method based on the amplitude of a - scan signal ; 2 . improved the gpr data acquisition and processing software , some utilities have been added such as position wheel control program , data format translation etc . ; 3 . implemented 3d targets imaging using mixed programming of matlab and visual c + + ; 4 本文的主要工作如下: 1 .研究了探地雷达回波信号杂波及背景去除算法,改进了一种基于a - scan信号强度的自适应滑动平均法; 2 .改进并完善了探地雷达数据采集处理软件,加入了定位轮控制数据采集、数据格式转换、目标距离测定等程序; 3 .研究了探地雷达目标成像算法,利用动态链接库技术实现了在脱离matlab环境下在visualc + +编写的程序中调用matlab程序对目标进行三维成像的功能; 4 .参加外场实验及项目验收。
