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改进的BBO算法
一个关于学习生物地理学算发的程序，方便菜鸟
- 2020-12-10下载
- 积分：1
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VHDL编写的信号发生器，可产生正弦波、三角波，方波。方波的占空比可调
cpld vhdl 信号发生器 正弦波 方波 三角波
- 2021-05-06下载
- 积分：1
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动态CGE代码参考—GAMS code
动态CGE文献附有详细代码。可以供大家参考一下
- 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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STM32利用IQmath库实现SVPWM
含有在keil上安装的IQmath文档，以及相关的IQmath.h文件，SVPWM算法实现的
- 2019-05-31下载
- 积分：1
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卡尔曼滤波器的PID控制
采用卡尔曼滤波器的PID控制。控制干扰信号与测量噪声信号幅值均为0.002的白噪声信号。采用滤波器是控制效果明显改善。
- 2020-12-07下载
- 积分：1
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visio图标模具库
大量丰富的visio图标资源，包括网络、计算机、建筑、人物、图形等各种元素。
- 2020-12-04下载
- 积分：1
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数字电路课程设计交通灯报告+能马上运行的Multisim10程序
由一条主道和一条支道的汇合点形成的十字路口，两道上的车辆交替通过，为确保车辆的安全,迅速通行,在交叉路口要求主车道和支车道两条交叉道的每个入口设置了红,绿,黄三色信号灯。红灯亮禁止通行；绿灯亮允许通行；黄灯给行驶的车辆有时间停靠到禁行线外。再通过题目和日常的经验我们可以得到以下的结论。① 用红,绿,黄,三色发光二极管作信号灯,主道红,绿,黄,绿（左拐）四个信号灯,支道红,绿黄三个信号灯。② 主干道和支道交替允许通行，主干道每次放行45秒，支道每次放行25秒。设计45秒和25秒计时显示器电路。资源中包括了报告和可运行的multisim仿真文件，只要电脑中有multisim10就能运行了
- 2020-12-03下载
- 积分：1
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TDMS转换成Mat文件
将TDMS格式转换为matlab可读的mat文件。批量转换文件夹下的所有文件。自动索引TDMS文件的组名和通道名称。自动命名mat文件名与TDMS文件名一致。改了一晚上，大家支持下。
- 2020-11-28下载
- 积分：1
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脉冲多普勒雷达信号处理
脉冲多普勒雷达信号程序仿真,包括信号生成,MTI滤波,多普勒滤波器组滤波,恒虚警处理
- 2021-05-06下载
- 积分：1
