A new scheme of target discrimination based on transient EM-fields is described in detail-in this paper. The fundamental theory and its mathematical deduction for getting scattering fields of single frequency of a excited target are given.We have got some more contented results, when this theory is used to linear target and conducting spheres. Several useful conclusions on calculating impulse response of targets are stated here. A practical and available scheme about measuring impulse response of a target in time domain is proposed Experimental results show that this new theory is useful.
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