Optimum design of radar pulses for stealth targets (time-domain approach)

The principles of an optimum design method of radar nonsinusoidal pulses for stealth targets are presented. To extract the principles of the method, first we have to obtain time-domain performance of the special absorber which is used on the target. Using the results of this time-domain approach, we can design an optimum pulse figure to maximise the reflected wave energy from the surface of the stealth target. This optimum pulse figure is not necessarily unique. We use a single layer model for the absorbing material but this method also can be generalized for multiple layer absorbing materials. Then we show, for the same absorbing material structure and the same reflected energy used by Mohamed (see IEEE Trans. on EMC, vol.37, no.2, 1995), one can use nonsinusoidal radar pulses with larger time-width (narrow-band pulses). So it is not necessary for the time-width of the pulse to be less than the propagation delay time in the absorbing material (as was stated by Mohamed). Finally, some optimum nonsinusoidal radar pulses are presented for some special applications of stealth targets.