This thesis discusses the pulse doppler ( pd ) weather radar signal processing system including digital intermediate frequency ( if ) receiver , especially on the application of if sampling and digital demodulation technique in pd weather radar signal processing system , the influence of amplitude and phase unbalances of in - phase and quadrature channels on weather radar echo spectrum estimation , ground clutters elimination algorithms and a typical engineering realization scheme of pd weather radar signal processing system 本论文研究的是采用数字中频接收技术的脉冲多普勒气象雷达信号处理系统，重点研究了中频采样及数字解调技术在脉冲多普勒气象雷达信号处理系统中的应用、正交双通道幅相不平衡对气象回波谱估计的影响、地杂波滤波算法，以及脉冲多普勒气象雷达信号处理系统的具体工程实现。
At last , this paper put forward a recognition method using the parameter of moving target the missle - borne pulsed doppler radar can be achived and the hmm and the analized the limited performance of the method under different circumstance . in chaper 4 , this paper analized the temporal chracreristic and spectral chracterisc of hovering helicopter , and then analized the possible methods for detection hovering helicopter and the message that can be achived 第四章中，本文首先分析了悬停直升机回波信号的时域特性和频域特性，结合弹载高重频脉冲多普勒雷达的一些具体参数分析了利用弹载高重频脉冲多普勒雷达对悬停直升机进行检测的可能途径和可利用信息。
Aiming at the restrictions of fft methods , this paper put forward a transform naming changing scale discrete chirp - fourier transform and applied it to detecting accelaration target using missle - borne high - prf pulsed doppler radar , at last this paper put forward a new sequential detection method . in the third part of this paper , aiming at the different characteristic of the extended target spectrum , this paper discussed the detecting and precised measuring the extended spectrum of the target 针对传统fft对加速目标进行积累检测时的局限性，提出了一种变尺度离散chirp ? fourier变换并将其应用于弹载高重频脉冲多普勒体制雷达对加速运动目标的检测背景中，提出了一种对加速运动目标的序贯检测算法。
Combined with the key project of the preliminary research of national defence science and technology , the target recognition system for millimeter wave initiative homing guidance , a systematic study on the signal processing method based on the background of millimeter mave ( mmw ) missle - borne pulsed doppler radar is performed . it include specifically the detction and the recognition of the moving target and hovering helicopter under strong clutter background 本文结合国防科技重点预研项目“毫米波主动寻的制导目标识别” ，针对脉冲多普勒体制雷达导引头的应用背景，对基于弹载高重频脉冲多普勒体制雷达的信号处理方法进行了较深入的研究。主要研究内容包括对杂波背景中的机动目标以及对悬停直升机的检测和识别方法。
First , this paper research and analyze the feature of signal of pulse doppler radar , and the mathematic model of radar is constructed . the several interference methods that narrow - band suppressing interference , range deception interference and velocity deception interference are discussed . and interference ability is evaluated and simulated 研究和分析脉冲多普勒雷达信号特征，建立了该种雷达的数学模型，并讨论对脉冲多普勒雷达的窄带噪声压制式干扰、距离欺骗干扰、速度欺骗干扰等几种干扰样式，并进行干扰性能评估和仿真研究。
Finally , based on the analysis of the stastistical characteristic of the range sidelobe ( rsl ) after the pulse compression accumulation of the rppm pd radar , one method has been brought forward to decrease the rsl and increase the ratio of the mainlobe to the sidelobe using fft and some simulations also have been acquired 最后在分析了随机脉位调制脉冲多普勒雷达脉冲压缩积累后距离旁瓣的统计特性基础上，提出了采用fft处理方案抑制距离旁瓣来提高主旁瓣比的方法，并给出了一些仿真结果。
In the second chapter the pulse doppler radar is introduced , include its definition , clutters , working condition and specialty and the theory of measuring range and measuring velocity in radar . in addition , the flow chat of the simulation and the function of the main modules are showed 第二章扼要论述了脉冲多普勒（ pd ）雷达体制和仿真软件的整体设计思想，给出了pd雷达的定义、杂波谱、分类及工作特点，阐述了雷达测距、测速的原理和方法，并且给出了仿真方案的流程图和仿真软件中各个模块的主要功能。
Chapter 3 concentrates on the important technology of pd radar ' s data processing . this chapter includes the resolution of range and velocity ambiguity and the theory of the start of tracking , the refreshment of tracking , the disappearing of tracking and the single target tracking . in the part of the refreshment of the tracking , the , the theory and realizing of the filtering algorithm and the point ? tracking relating are illustrated 第三章重点叙述了脉冲多普勒雷达数据处理的关键技术，包括数据录取时距离和速度的解模糊； pd雷达工作在搜索状态下目标航迹的起始，航迹的更新，航迹的消失，以及目标的编批和最优先级目标的判断，其中航迹更新中主要讲述了跟踪滤波和点迹?航迹关联的原理及实现； pd雷达工作在跟踪状态下的单目标跟踪原理。
