The digital msk demodulation based on the dsp system employed the theory of power spectral analysis to demodulate the digital msk modulated signal 在本文中的数字化解调是基于dsp系统，并利用功率谱估计的理论对msk已调信号进行功率谱的估计来实现的。
The contributions of this thesis are listed as follows : ( 1 ) three kinds of methods to estimate the period of pn sequences of the ds / ss signals are studied first 主要工作如下: ( 1 )分析了相关波动法、二次功率谱法和四阶累积量法等伪码周期估计方法。
The power spectral density of ship ' s motion is calculated based on ocean wave energy spectrum , and the movement spectrums of the ship ' s random motion are calculated and created 根据海浪波能谱，计算了舰船摇荡运动的功率谱密度和舰船的随机摇荡运动。
The numerical results demonstrate that the larger the zone of timing jitter and the higher the frequency , the less proportion the discrete psd component is in the total psd 数值计算结果表明，随时间抖动范围增大和频率提高，离散功率谱分量所占比例下降。
The human ear is very sensitive to the speech in the frequency band from 2khz to 4khz , but the speech power spectrum in this frequency band is very small 人耳对2khz ~ 4khz频段的语音非常敏感,但是此频段语音的功率谱本身比较小,因而设计出的减参数将比较大。
Then , chapter 2 shows how to generate the stationary random excitation of the road roughness from the given spectrum amplitude of the road roughness with the random phase 基于随机相位生成平稳随机路面激励,证明了车辆变速工况下的随机路面激励谱为均匀调制演变功率谱。
The result shows that the psd of the electromagnetic pulses consists of a continuous component and a discrete component , with the total power of the two parts being conservative 结果表明，这类电磁脉冲串的功率谱密度由离散谱分量和连续谱分量组成，它们组成的总功率守恒。
A power spectrum analysis method based on the phase of complex - wavelet - transform , which derives fault information from gear vibration signal by phase , is presented 提出了基于复小波变换相位功率谱的方法。该方法从复小波变换的相位的角度来提取齿轮振动信号中的故障信息。
In order to obtain these data , we must at first calculate apsds ( auto - power spectral density ) and cpsds ( cross - power spectral density ) of the three signals in the system 而想要得到这些核心参数,必须先分析估计出系统中三路信号的自功率谱密度和两两之间的互功率谱密度。
