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文主要目的是针对讯号频谱分析仪(Signal spectrum analyzer)做功能测试，以确定讯号频谱分析仪之各种运算功能正确，其中测试共
分为正弦与余弦波检查、反假象滤波器检查(Antialiasing Filter Check)、频率响应函数与相位角检查(FRF & Phase Check)、自身能量密度函
数检查(Power Spectrum Check)、动态范围检查(Dynamic Range Check)等五个项目的快速傅立叶转换检查(Fast Fourier Tran
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用FFT计算信号的功率谱密度时，需要先计算FFT，再计算双边谱密度，然后计算单边谱密度。在matlab里注意FFt要除以采样点数，计算双边谱时要注意除以频率分辨率。
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When calculated using the FFT power spectrum density signal, you need to calculate the FFT, and then calculate the bilateral spectral density, and then calculate
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Calculating a target and ocean echo power spectral density, Decoupling, restore the original signal, Including regression analysis and probability and statistics.
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Including compression ratio, image restoration computing uptime and peak signal to noise ratio, For feature reduction, feature fusion, correlation analysis, Calculating a target and ocean echo power spectral density.
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Has been successful debugging. M contains files can be directly run, The received signal is given eye and BER simulation systems, Calculating a target and ocean echo power spectral density.
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Calculating a target and ocean echo power spectral density, When processing a signal frequency analysis, Using wavelet denoising thought.
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For time-frequency analysis algorithm, Continuous phase modulation signal (CPM) to produce, Calculating a target and ocean echo power spectral density.
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对建立的AR模型，利用Levinson-Durbin递归公式计算了模型参数，对输入信号的功率谱密度进行了估计，并绘制了信号的时域图和功率谱图。(For the established AR model, the Levinson-Durbin recursive formula is used to calculate the model parameters, and the power spectral density of the input signal is estimated, an
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生成一个采样频率2000，由50Hz、120Hz、200Hz正弦信号以及噪声信号组成的数字信号，滤掉150Hz>f>100Hz的频率，计算并显示滤波前后的原始数据波形以及功率谱密度。(A sampling frequency of 2000, a digital signal composed of 50Hz, 120Hz, 200Hz sine and noise signals, is generated to filter out the frequency of 150Hz&
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生成一个采样频率2000，由50Hz、120Hz、200Hz正弦信号以及噪声信号组成的数字信号，滤掉150Hz>f>100Hz的频率，计算并显示滤波前后的原始数据波形以及功率谱密度。(generating a sampling frequency of 2000, a digital signal composed of 50Hz, 120Hz, 200Hz sine and noise signals, filter out the frequency of 150Hz>f&
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计算目标和海洋回波的功率谱密度,用于信号特征提取、信号消噪，Pisarenko谐波分解算法。( Calculating a target and ocean echo power spectral density, For feature extraction, signal de-noising, Pisarenko harmonic decomposition algorithm.)
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语音信号是一个非平稳时变的信号，所以用计算稳态信号的方法计算功率谱密度函数没有太大意义，看不出信号的动态变化，"gonglvpu"给出计算短时功率谱密度函数(Speech signal is a non-stationary time-varying signal, so it is not very meaningful to calculate the power spectral density function by calculating the steady-st
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用MATLAB产生一个频率为1Hz，功率为1的余弦信源，载波频率为10Hz，显示信号的波形及包络，求出调制信号的功率谱密度，以及相干解调后的信号波形(A cosine source with 1 Hz frequency and 1 power is generated by using MATLAB. The carrier frequency is 10 Hz. The waveform and envelope of the signal are displayed. The power
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采用直接法或间接法（通过自相关函数）编制matlab程序，计算信号cos（2πf1t）+cos（2πf2t）叠加高斯白噪声后的功率谱密度。(Matlab program is compiled by direct method or indirect method (through autocorrelation function) to calculate the power spectral density of signal cos (2 PI f1t) +cos (2 PI f2t) s
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SSB 调制信号，代码含有调制信号波形和功率谱密度波形(SSB modulated signal, code containing modulated signal waveform and power spectral density waveform)
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