CW-FM pulse fusion schemes

It is commonly understood that in active detection system constant-frequency pulses correspond to good Doppler but poor delay resolution capability; and that linearly-swept frequency pulses have the opposite behavior. Many systems are capable of both types of operation, and hence in this paper the fusion of such pulses is examined. It is discovered that in many (but not all) situations the features complement in such a way that tracking performance using a combined CW-FM pulse is improved by an order of magnitude when compared to a scheme using only a full CW or FM pulse. Also investigated are alternating- pulse systems, and while these are suboptimal their performances appear robust.