Radar waveform synthesis for exciting single-mode backscatters from a sphere and application for target discrimination
A new scheme for radar detection and discrimination, the radar waveform synthesis method, is investigated for a spherical target. This scheme consists of synthesizing a waveform for the incident radar signal which excites the target in such a way that the return signal from the target consists of only a single natural mode of that target in the late-time period. When the incident waveform synthesized to excite a particular natural mode of a known, preselected target is applied to a wrong target, the return signal will be significantly different from that of the expected natural mode; thus the wrong target can be sensitively discriminated. An approximate impulse response of a sphere is obtained by summing up an infinite number of natural modes of the sphere based on the singularity expansion method. Required incident signals for exciting various single-mode backscatters from the sphere are obtained. Numerical examples are given to demonstrate target discrimination sensitivity based on this method.