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OSG绘制约束线
osg用约束线去掉想去掉三角网的区域，实现地形的裁剪和编辑，方便灵活。
- 2020-11-28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LabVIEW单片机串口通信小程序
基于LabVIEW单片机串口通信小程序，我也是拿的人家，在此分享下下
- 2020-12-04下载
- 积分：1
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msk调制的verilog程序
实现了msk调制，用verilog程序写的，从网上找的好使的
- 2021-05-07下载
- 积分：1
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基于51单片机电子密码锁的设计 C程序
根据设定好的密码，采用二个按键实现密码的输入功能，当密码输入正确之后，锁就打开，如果输入的三次的密码不正确，就锁定按键3秒钟，同时发现报警声，直到没有按键按下3种后，才打开按键锁定功能；否则在3秒钟内仍有按键按下，就重新锁定按键3秒时间并报警。
- 2020-12-12下载
- 积分：1
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利用审查元素漏洞无限撸发卡网CDK
审查元素是Google Chrome浏览器提供的一项服务功能，用户只需右键点击“审查元素”（名字），即可打开Chrome Inspector，获得网页各种元素的加载时间、Javascript函数、Object等信息。 本次教程为教大家利用审查元素无限撸发卡网CDK（非所有发卡网通用） 本教程权供与学习于参考
- 2019-09-29下载
- 积分：1
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异步电机矢量控制磁链观测
【实例简介】磁通观测说明：
///////////////////////////0519主要程序
flux_d=flux_d_o+T*(edss+20*reg3*cos_theta-20*flux_d_o);
flux_q=flux_q_o+T*(eqss+20*reg3*sin_theta-20*flux_q_o);
///////////////磁通的大小在0.3-0.8之间
if(flux=0.8)
reg3=0.8;
end
if(flux=1))
reg3=abs(we);
if(we>=0)
flux_d_comp=flux_d+flux_q;
flux_q_comp=flux_q-flux_d;
else
flux_d_comp=flux_d-flux_q;
flux_q_comp=flux_d+flux_q;
end
% else
% reg3=1;
% flux_d_comp=flux_d;
% flux_q_comp=flux_q;
% end
%-----------------------
flux_d_r=(Lr/Lm)*(flux_d_comp-(o*Ls*idss));
flux_q_r=(Lr/Lm)*(flux_q_comp-(o*Ls*iqss));
/////////////////////////////////
////////////////////////////在磁通观测的这些已有的m文件中，
0254，0617，0623，0701采用的方法是zw论文中提及的p34-p35的方法，
其中函数之间的区别是在参数上作了调整。0518，0519方法同上。
0520采用不同方法？？
- 2021-11-18 00:33:54下载
- 积分：1
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非线性有限元及程序（凌道盛/徐兴）
非线性有限元及程序,作者:凌道盛/徐兴, 《非线性有限元及程序》内容包括非线性有限单元法的基础知识、主要算法、软件工程的基本思想、非线性有限元程序vfeap和工程算例等
- 2020-12-01下载
- 积分：1
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MATLAB禁忌搜索算法求解TSP问题
通过禁忌搜索算法求解经典的TSP问题（MATLAB源代码），TSP问题为假设有一个旅行商人要拜访n个城市，他必须选择所要走的路径，路径的限制是每个城市只能拜访一次，而且最后要回到原来出发的城市。路径的选择目标是要求得的路径路程为所有路径之中的最小值。
- 2020-07-03下载
- 积分：1
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文字转语音神器
文字转语音神器 文字转语音神器文字转语音神器文字转语音神器文字转语音神器
- 2020-12-07下载
- 积分：1
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