Abstract : the threshold algorithm of the target detection is often used to detect target echo signals . its performance is based on signals - noise ratio . when signals - noise ratio is great than 6 . 7 , the target can be detected . in order to increase the signals - noise ratio , matching filter is often used . if the system is narrow band system , the noise is color noise and matching filter cannot be used . therefore , the signals - noise ratio cannot be increased . however , the geometrical characteristic of the laser echo signal is different with the noise . this paper advises the algorithm that detects the target by the geometrical characteristic . when signals - noise ratio is great than 2 , this algorithm can detect target . this algorithm has been used in practice 文摘:目标检测的阈值法经常用于检测目标的回波信号.它的性能取决于信噪比,当信噪比大于6 . 7时,能够检测出目标.为了提高信噪比,经常采用匹配滤波器.如果系统是窄带系统,噪声为色噪声,无法使用匹配滤波器,不能提高信噪比.激光回波信号的几何特征不同于噪声.提出了一种利用这种几何特征检测目标的算法.当信噪比大于2时,该算法能够检测出目标.该算法已经实际应用
The paper includes four sections followed here : the first section studies the modeling of signals of pulse doppler radar seeker , and establishes a radar signal simulation model , including radar emitting signal model , receiving signal model , receiving echo signal model , clutter model , noise model , sum channel directional pattern of antenna model , difference channel directional pattern of antenna model , sheltering model , rcs model , glint noise model , etc . the second section studies signal processing of pulse doppler radar seeker , and establishes radar signal processing mathematical model and data processing mathematical model for simulation , including windowing , doppler filtering , envelope demodulation , pdi , cfar , centering , velocity tracking , angle tracking , a - b filtering , etc . the third section studies the modeling of modified proportion guiding , and establishes guiding model , then dynamic simulation results is provided 论文的主要工作包括四部分：第一部分研究了脉冲多普勒雷达导引头的信号建模问题，建立了雷达信号模型，主要包括：发射信号模型、接收信号模型、目标回波信号模型、杂波模型、噪声模型、和差通道天线方向图模型、遮挡因子模型、接收机噪声模型、目标雷达截面积统计性模型、目标角闪烁模型等。第二部分研究了脉冲多普勒雷达导引头的信号处理模式，建立了信号和数据处理模型，主要包括：加窗和多普勒滤波、包络检波、检波后积累、频域cfar处理、速度定心、速度跟踪、角跟踪、 ?滤波等，然后给出了信号处理流程。
On the premise that the basal transducer layout was designed according to the requirements of deep - sea exploring surroundings and technology on the basis of the hardware structure and data collecting ways of interferometric sonar , the echo signal by energy relativity search is analyzed and calculated , altitude data of the tiny terrain on the seabed under real - time irradiation of ultrasonic is gained as to provide parameters of best cutting depth for intellectualization of the seabed mining vehicle timely and promptly 摘要在相干声纳硬件结构及数据采集方式的基础上，结合具体的深海钴结壳探测环境和技术要求，确定了换能器基本布局，探讨了信号采集与处理方法，利用能量相关搜索法对回波信号进行分析和计算，得出超声波实时照射下的海底表面微地形高程数据，为海底采矿车智能化开采提供实时、快速的最佳切削深度参数。
According to the seismic convolution model , a kind of matched filters in time - scale domain is designed for echo signal detection of ground penetrating radar ( gpr ) and implemented in this paper , which is applied to detect the location and amplitude of single reflection wavelet in receiving signal through continuous wavelet transform 摘要根据地震褶积模型，设计并实现了应用于探地雷达回波信号检测的时间尺度域匹配滤波器，利用小波变换的时间定位性和尺度伸缩性，检测出雷达接收信号中单个反射子波的位置与强弱信息，利用已知的雷达发射子波模型还原回波信号，达到了滤除噪声、最佳接收的目的。
In this paper , the target simulator was designed to test the performance of tail moving targets in the radar system . based on the recent developments of target simulators , the characteristics of echo signals were analyzed . a novel scheme that combined microwave receiving / transmitting system with high - performance digital signal processing system was provided 首先回顾了近二十年来目标模拟器的发展，分析了回波信号的特点，在此基础上提出了采用微波收、发系统与数字信号处理系统相结合实现多目标模拟器的设计方案，并确定以具有灵活编程和高速处理能力的数字信号处理芯片( dsp )为核心构成数字信号处理系统。
In order to improve the ranging accuracy of a lidar , the effect of amplitude and width of the echo signal on the ranging accuracy of a lidar with bell - type laser pulses in temporal domain and gaussian pulses in spatial domain , was studied under the condition of constant - voltage - amplitude discrimination 摘要为了提高脉冲激光雷达的测距精度，研究了光束在空域为高斯光束、时域为钟型脉冲的激光雷达在恒电压幅度鉴别模式下，回波信号幅度变化和宽度变化对测距精度的影响。
The authors use a ultrasonic transducer emit ultrasonic to simulated seabed tiny terrain , then analyze and calculate the relativity of amplitude according to the time , phase and amplitude etc included in echo signal and making using of the relativity of amplitude characteristics , at last gain the real - time altitude data of tiny terrain for deep - sea cobalt crusts mining in order to provide the parameter of best cutting depth for the intellectualized mining of excavating head 摘要通过超声波换能器向模拟海底微地形发射超声波，根据回波信号包含的时间、相位和幅度等信息，利用幅度特征相关性进行分析和计算，得出深海钴结壳开采所需要的实时微地形高程数据，为采掘头智能化开采提供最佳切削深度参数。
According to the generation approaches of sar echo signal and the results of dsp realization , this dissertation combines the requirement of sar ’ s original echo signal simulator to do the work of algorithm research , dsp realization and so on , which includes the process of theory research , scheme design , software design , realization and debugging 本文根据sar原始回波信号生成方法及dsp实现的相关研究成果,结合sar原始回波信号模拟器的实际需求,研究算法以及dsp实现等项工作,涵盖了理论研究、方案设计、软件设计及实现和调试等工程项目的研制过程。
