On the basis of data processing, we analyze the power spectrum density of coordinate component noise at each site and calculate the spectral indexes manifesting the noise property of each component.

在对数据进行清理的基础上，分析了各站坐标分量噪声的功率谱密度，计算了表征各分量的噪声特性的谱指数。

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The spectral noise power density of pure avalanche diodes is compared with that of avalanche the diodes with tunneling penetration.

比较了纯PN结雪崩二极管和带有隧道穿透的PN结雪崩二极管的噪声功率谱密度。

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Due to its low power spectral density, the direct sequence spread spectrum signal 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。

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