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使用SGP4模型计算卫星的实时位置和姿态
使用两行元素(TLE)文件，计算指定卫星的实时位置和姿态
- 2021-05-06下载
- 积分：1
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标准测试图像(含lena,boboon等bmp,tiff,jpg图像
标准测试图像(含lena,boboon等bmp,tiff,jpg图像
- 2020-12-01下载
- 积分：1
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粒子群优化的极限学习机matlab源代码
PSO-ELM粒子群优化的极限学习机，通过调节参数拟合效果很好，便于大家使用，为学者和科研人员提供基础和思路
- 2020-12-05下载
- 积分：1
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西门子OPC AE采集源码
西门子840D报警采集源码 ，OPCAE采集西门子840D报警采集源码 ，OPCAE采集
- 2020-12-04下载
- 积分：1
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塑性动力学_杨桂通等
塑性动力学_杨桂通等献给搞研究的同志们pdf压缩的
- 2020-11-30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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分布式的PCA
传统的PCA在处理高维度的数据时，可能会遇到很多问题，在PCA的基础上，DPCA很好的解决了数据维度大的问题，资源里包括两篇关于DPCA的论文以及对应的代码。
- 2020-12-07下载
- 积分：1
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MT2503D原理图PCB参考设计
MTK原厂参考设计，IOT应用。MT2503D芯片是基于ARMv7和采用高集成度系统级封装的物联网芯片平台，支持高精度全球卫星导航系统（GNSS）、蓝牙3.0和2G基带，适用于功能简单的移动设备、安全或工业应用等领域。
- 2021-05-06下载
- 积分：1
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人事管理系统（java数据库课程设计）+SQL数据库
员工各种信息：包括员工的基本信息，如编号、姓名、性别、学历、所属部门、毕业院校、健康情况、职称、职务、奖惩等；员工各种信息的修改；对转出、辞退、退休员工信息的删除；按照一定条件，查询、统计符合条件的员工信息；教师教学信息的录入：教师编号、姓名、课程编号、课程名称、课程时数、学分、课程性质等。科研信息的录入：教师编号、研究方向、课题研究情况、专利、论文及著作发表情况等。按条件查询、统计，结果打印输出。
- 2020-06-29下载
- 积分：1
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一种改进的时频联合估计的SC算法
OFDM系统中的定时同步和频率同步算法——时频联合估计的SC算法，由Schmidl和Cox提出，是一种基于训练序列的符号同步和载波频率同步的联合估计算法。本算法是对SC算法的改进。
- 2020-12-08下载
- 积分：1
