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7下载:
高分辨率要求系统具有大的带宽,瞬时带宽的增加必将提高系统对硬件的要求,本文采用方便灵活的步进频率波形信号。脉间频率步进波形通过子脉冲载频的步进变化来获得大的有效带宽,使成像具有高分辨率,采用加窗和补零方法提高信噪比,但该信号对目标径向速度非常敏感。采用补零方法提高距离取样分辨率,使距离像细化,并用公式说明了补零只能提高距离取样分辨率,并不能改变频率步进信号的距离分辨能力。该信号波形对目标径向速度的敏感,使目标能量分散到邻近的距离单元造成距离分辨率下降,如果不事先进行速度补偿,直接对回波信号进行逆
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设模拟带通信号频率范围1KHz—1.1KHz,设计一个采样频率8KHz数字频谱分析系统,要求频率分辨率0.1Hz。若对信号直接用FFT进行频谱分析-simulation based communications, with the frequency range 1KHz - 1.1KHz. Design of an 8 KHz sampling frequency digital spectrum analysis system requirements frequency resolutio
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小数分频技术解决了锁相环频率合成器中的频率分辨率和转换时间的矛盾, 但是却引入了严重的相位噪声,
传统的相位补偿方法由于对Aö D 等数字器件的要求很高并具有滞后性实现难度较大。$2 调制器对噪声具有整形的功
能, 因而将多阶的$2 调制器用于小数分频合成器中可以很好地解决他的相位噪声的问题, 大大促进了小数分频技术的
发展和应用。文章最后给出了在GHz 量级上实现的这种新型小数分频合成器的应用电路, 并测得良好的相噪性能。,Fractional-N technology to s
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做FFT只能看出信号在0到分析频率(采样频率的一半)之间的相对分布,或者说得到以采样频率归一化的频率。
采样频率即取样频率,指每秒钟取得信号样本的次数。所以,采样频率就是1/(delta t),其中delta t为连续采两次信号的时间间隔。
采样频率/采样点数=频率分辨率。
-Signal do FFT can only be seen in the 0 to the analysis frequency (half the sampling frequency) relative
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用DE2开发板做的DDS程序,频率分辨率可以达到1Hz!-DE2 development board to do with the DDS process, the frequency resolution can be achieved 1Hz!
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仿真获取四幅互差半个像素的低分辨率图像,利用反演解析算法重建出一副高分辨率图像,属于亚像元技术或者超分辨率技术。-Simulation Interoperability poor access to four half-pixel low-resolution images, the use of inversion algorithm for the reconstruction of an analytic high-resolution images, belong to sub-pixe
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自己写的利用FFT变换实现的声音频谱分析函数,支持多声道wav,可以对FFT变换点数、时间分辨率、频率分辨率、显示方式进行定制-Wrote it myself using FFT transform the voice spectrum analysis function, support multi-channel wav, can transform FFT points, time resolution, frequency resolution, and display customiz
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高分辨率差分跳频信号频率检测.pdf-实用的差分跳频信号频率检测文档。-High-resolution detection of differential frequency hopping signal frequency. Pdf-useful signal frequency detection of differential frequency hopping document.
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基于FPGA的DDS信号发生器的简单实现。DDS(直接数字合成)是近年来迅速发展起来的一种新的频率合成方法。这种方法简单可靠、控制方便,且具有很高的频率分辨率和转换速度,非常适合快速跳频通信的要求。 -FPGA-based signal generator DDS simple to achieve. DDS (direct digital synthesis) is a rapidly in recent years developed a new method of frequency sy
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处理心电信号中的基频漂移和工频干扰的一种算法。-a resolution to solve the baseline drift and line-frequency
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1)编写DFT子函数(计算并画出幅频特性),以后可调用。
2)N=32,M=32,128,256时,分析频率分辨率、频谱的光滑程度。
3)N=64,256,512时,分析频率分辨率和频谱的光滑程度。
-1) the preparation of DFT Functions (calculated and drawn amplitude-frequency characteristics), the future can be called. 2) N = 32, M = 32,128
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This program describes the use of Inverse Synthetic Aperture Radar (ISAR) with stepped-frequency waveform (SFWF) to produce a high-resolution, 2D image of a target. -This program describes the use of Inverse Synthetic Aperture Radar (ISAR) with
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实现dft基本功能。对频率分辨率有特殊说明,希望对您有帮助。-The realization of the basic functions of dft. Frequency resolution of special note, I hope for your help.
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changing screen resolution and screen frequency in delphi-changing screen resolution and screen frequency in delphi
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A circuit to measure Frequency upto 655 KHz with a resolution of ~10 Hz. Uses 8051 controller with 16x2 LCD display as an O/P device. See http://sites.google.com/site/munish4u911ex/Home/8051projects-simulations/8051-freqcounter for hardware connectio
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把整个频率范围中的某段重点频区局部放大,获得比整个频率范围高的频率分辨率,从而观察频谱中的细微部分-The entire frequency range of the frequency of certain key areas enlarged to obtain the entire frequency range than the high frequency resolution, and thus observe the subtle part of the spectrum
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再短时傅里叶变换中设置时间分辨率,此时信号的短时傅里叶变换在时间轴上完全局部化而没有频率分辨率-Short-time Fourier transform and then set the time resolution, this time the signal short-time Fourier transform in the timeline is completely localized but not the frequency resolution of
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讲述MATLAB进行信号分析时,频率分辨率的问题,文章通过列子详细介绍了此问题的注意事项-About MATLAB for signal analysis, the frequency resolution of the issue, the article described in detail by Liezi note of this problem
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A Technique to Increase the Frequency Resolution of PICmicro MCU PWM Modules
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包括TVD去噪(速度非常快),最小平方最优程序,用于稀疏频率分解,很好用。-Including TVD noising (very fast), the least-squares best program for sparse frequency resolution, very good use.
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