Then the influence on the averagepowerspectrum and bispectrum of specklegrams caused by the photon noise, additive noise and more complex noises of other kinds in the detecting system .
The powerspectrum of the noise and signal are estimated by the average smooth periodogram method.
用平均平滑周期图法分别估算出信号与噪声的功率谱密度函数。
3
The averagepower reflection coefficient, directivity, power spectrum are obtained for different edge plasma densities and for different phasings between main waveguides.