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数字通信同步技术的MATLAB与FPGA实现——AlteraVerilog版光盘
数字通信同步技术的MATLAB与FPGA实现——AlteraVerilog版（2到8）
- 2020-12-10下载
- 积分：1
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MW级直驱永磁同步风力发电机设计
MW级直驱永磁同步风力发电机设计MW级直驱永磁同步风力发电机设计MW级直驱永磁同步风力发电机设计MW级直驱永磁同步风力发电机设计MW级直驱永磁同步风力发电机设计
- 2020-12-03下载
- 积分：1
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Matlab最小二乘法曲线拟合(源码+注释+运行截图)
matlab最小二乘法进行曲线拟合（源码+注释）特别详细介绍了多项式拟合（代码+运行截图）。
- 2021-05-06下载
- 积分：1
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FAM和SSCA算法的matlab源程序-detection and identification of signal
FAM和SSCA算法的matlab源程序-detection and identification of signalFAM和SSCA算法的matlab源程序-detection and identification of signalDISCLAIMER NOTICEMTHIS DOCUMENT IS BESTQUALITY AVAILABLE. THECOPY FURNISHED TO DTICCONTAINED A SIGNIFICANTNUMBER OF PAGES WHICH DONOT REPRODUCE LEGIBLY.ilApproved for public release; distribution is unlimitedDETECTION AND IDENTIFICATION OF CYCLOSTATIONARY SIGNALSEvandro luiz da costaLieutenant Commander, brazilian NavyB.S., Instituto Militar de Engenharia, 1980Submitted in partial fulfillmentof the requirements for the degree ofMASTER OF SCIENCE IN ELECTRICAL ENGINEERINGANDMASTER OF SCIENCE IN ENGINEERING ACOUSTICSfrom theNAVAL POSTGRADUATE SCHOOLMarch 1996Author.Evandrodk da costaapproved byRQ求Ralph Hippenstiel, Thesis Co-AdvisorRoberto Cristi, Thesis Ca-AdvisoiHerschel. Loomis, Jr, hairmanDepartment of Electrical and Computer EngineeringArthony A. Atchley / ChairmanEngineering Acoustics Academic CommitteeABSTRACTPropeller noise can be modeled as an amplitude modulated(AM) signalCyclic Spectral Analysis has been used successfully to detect the presence ofanalog and digitally modulated signals in communication systems. It can also identithe type of modulation. Programs for Signal Processing based on compiledlanguages such as FORTRAN or C are not user friendly, and MATLAB basedprograms have become the de facto language and tools for signal processingengineers worldwideThis thesis describes the implementation in mAtlab of two fast methods ofcomputing the Spectral Correlation Density(SCD)Function estimate, the FFTAccumulation Method (FAM)and the Strip Spectral Correlation Algorithm( SSCA),toperform Cyclic Analysis. Both methods are based on the Fast Fourier transformFFT)algorithm. The results are presented and areas of possible enhancement forpropeller noise detection and identification are discussedTABLE OF CONTENTSINTRODUCTIONA MOTIVATION,P,中“····*s···:···:B BACKGROUNDC THESIS GOALSIL NOISE IN THE OCEAN··+A TYPES OF UNDERWATER NOISE25561. Ambient Noise番申2. Self noise3. Radiated noise8B RADIATED NOISE FROM SHIPS, SUBMARINES AND TORPEDOES.......8C PROPELLER NOISE10lI CYCLOSTATIONARY PROCESSING15A CYCLOSTATIONARIT15B THE CYCLIC AUTOCORRELATION FUNCTION (ACF)17C THE SPECTRAL CORRELATION DENSITY FUNCTION (SCD)18N. ESTIMATION OF THE SPECTRAL CORRELATION DENSITY FUNCTION23A FFT ACCUMULATION METHOD(FAM)25B STRIP SPECTRAL CORRELATION ALGORITHM(SSCA■D28V. EXPERIMENTAL RESULTSA. ANALOG-MODULATED SIGNALS311. Amplitude Modulated(AM)Signal===2-312. Pulse-Amplitude Modulated(PAM) Signal58B DIGITAL-MODULATED SIGNALS1. Amplitude Shift Keying(ASK) Signal中中非昏号即即号自唱即自曲音非带卡.最662. Binary-Phase Shift Keying(BPSK) Signal6了VI CONCLUSIONS81A SUMMARY81B SUGGESTIONS82APPENDIX A-CALCULATION OF THE SCD FUNCTION OF AN AMPLITUDE-MODULATED SIGNAL83APPENDIX B-FUNCTION AUTOFAM95APPENDIX C-FUNCTION AUTOSSCA99APPENDIXD-FUNCTION CROSSFAM103APPENDIX E-FUNCTION CROSSSSCA109APPENDIX F-PLOTTING ROUTINES113LIST OF REFERENCES115INITIAL DISTRIBUTION LIST看音117INTRODUCTIONA. MOTIVATIONPropeller related acoustic signatures typically exhibit modulationcharacteristics. These modulation characteristics originate from the cavitationprocess that takes place in the water due to the cyclic movement of the propellerThe cavitation process is basically the collapse of air and vapor bubblesdue to variations in the static pressure. These variations in static pressure are aconsequence of the passage of the propeller blades through the water. Thismovement, cyclic in nature, causes amplitude modulation in the static pressureand as a consequence an amplitude-modulated(AM) signal can be detected in areceiverCyclostationary processing techniques have been used to detect andlentify analog and digital communication signals very successfully. Thesetechniques have the advantage of using a more realistic model for the signalthan the stationary model used in most of the more conventional signalprocessing techniquesB BACKGROUNDThe basic elements of cyclic spectral analysis are the time-variant cyclicperiodogram and the time-variant cyclic correlogram. These two functions form aFourier transform pair. This fact is known as the cyclic Wiener relation or thecyclic Wiener-Khinchin relation [Ref. 1: p. 49.1
- 2020-12-05下载
- 积分：1
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基于双目视觉的图像三维重建
三维重建的经典论文。通过一定的手段获取真实物体的几何形状，一般称为三维重建过程。三维重建是指利用二维投影恢复物体三维信息(形状等)的数学过程和计算机技术,包括数据获取、预处理、点云拼接和特征分析等步骤。
- 2020-11-27下载
- 积分：1
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Introduction to Radar Systems.pdf
Introduction to Radar Systems.pdf
- 2020-12-07下载
- 积分：1
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数学分析习题课讲义.
对于学习考研有很大帮助.目录中有连接,点击即可翻页,使用方便.
- 2020-12-07下载
- 积分：1
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ESP32-S2-WROOM 原理图pcb 模块封装.zip
【实例简介】乐鑫最新 ESP32-S2-WROOM 模组封装 官网都是阿里狗的 这个封装是AD的封装 有需要的朋友可以下载参考
- 2021-11-25 00:40:48下载
- 积分：1
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点特征直方图（PFH）算法的matlab实现，以及基于PFH的点云拼接实验
[原创]根据文献使用matlab实现了PFH算法，并使用它对bunny数据进行了基于特征匹配和RANSAC的拼接实验。关键点选取和特征匹配部分是直接用的之前文献复原的内容(资源已发布)，仅用来测试PFH的有效性。由于运行速度过慢，我将代码分为三块，依次运行PFH_demo.m（关键点提取）、PFH_demo2.m（PFH计算，耗时）、PFH_demo3.m（拼接实验与结果展示）。代码中实现的是64维度的描述符，与PCL中的略有不同。关键点如果用3D harris效果应该会更好一点。
- 2020-12-05下载
- 积分：1
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信号灯倒计时器-中华人民共和国公共安全行业标准.doc
【实例简介】信号灯倒计时器-中华人民共和国公共安全行业标准
- 2021-09-17 00:31:16下载
- 积分：1
