New results of the twin processor method of measurement of the channel and/or scattering functions

In radar and sonar applications in which channel multipaths are present or targets are doubly spread, the scattering function is used to characterize the effects of the complex target on the problem of target detection. Thus, it is important to minimize the reverberation effects when measuring the channel scattering function. In the authors´ recent work (see ibid., p.1337, 1991) the twin processor method for measuring the scattering function was proposed. It had improved capabilities over the traditional matched filter receivers for measuring target and/or channel structures by reducing sidelobe interactions. In the method two signals were transmitted and processed, thus having an implicit 3-dB SNR improvement. For the twin processor to be useful, more than 3-dB SNR improvement is desired, and in this work the authors address this issue by considering different outputs, real and imaginary parts, of the receiver proposed in their previous work