试用周期图法估计信号的功率谱；
The probationary period plan estimates the signal power spectrum;
引出了时—频功率谱的概念。
The concept of time - frequency power spectrum is introduced.
在计算方法上，创造性地利用功率谱来计算血流参数。
And the blood flow parameters are calculated with the power spectrogram method.
根据相位噪声功率谱的幂律模型，近似地模拟了相位噪声。
Flicker noise is approximately simulated by power law model of phase noise spectral density.
功率谱密度（PSD）函数在阵风载荷飞行试验数据分析中占有重要的地位。
The power spectrum density (PSD) function is important in gust load flight experiment data analysis.
最后进一步优化系统的功率密度谱。
Finally, we further optimize the power distribution over the whole system.
最后进一步优化系统的功率密度谱。
Finally, we further optimize the power distribution over the whole system.
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