Zhang Shanwen

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The effect of cross section dimension in trapezoid tunnel on cutoff frequency is analyzed with edge element method. The variation of cutoff frequency in trapezoid tunnel with top side, bottom side and height changes are found, respectively. It comes to a useful conclusion that the cutoff frequency of trapezoid tunnel is determined by the larger one of(More)
Radar signal separation is an important link in the chain of information processing for air-defense, which is the process of extracting unknown independent radar signals from unknown sensor measurements. Sometimes, the source signals and the method of combination are unknown, and hence the problem is related to the problems of blind deconvolution and blind(More)
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