In the millimeter band, the variations are found of the power density of the rain clutter induced by back scattering with frequency and rain rate.
在毫米波段计算了雨区的后向散射引起的雨杂波功率密度随频率及降雨率的变化。
Noise and disturbances on the power network include over voltages, under voltages, frequency variations and so on.
噪声和干扰在力量网络包括结束电压，在电压，频率变异之下等等。
The impacts of the variations of the active power vacancy and other relevant parameters on the frequency dynamic process were pointed out.
指出有功缺额等相关参数的变化对系统频率动态过程的影响。
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