Meaning: The self-correlation function and power spectrum density Function of a power-typed signal compose a FT pair.

上式表明： 功率型信号的自相关函数与其功率谱密度函数构成傅立叶变换对。

youdao

This algorithm has utilized the signal to carry on the signal characteristic that Fourier includes in the density of the power spectrum after Fourier transform.

算法利用了信号进行傅里叶变换后功率谱密度中所包含的信号特征在基带完成，并用软件实现。

youdao

Due to its low power spectral density, the Direct Sequence Spread Spectrum signal (DSSS) is always submerged with the back-ground noise, so that it is difficult to reconnoiter the signal.

直接序列扩频信号具有较低的功率谱密度，信号淹没在背景噪声中，侦查难度较大。

youdao