Elimination of rabbit ear effect in digital channelized receivers

In channelized receivers which are used for electronic support systems, when a pulse modulated signal is received, rabbit ear effect occurs at the out of band channels of the channelizer. In this paper rabbit ear problem and its reasons are analyzed, different methods based on both amplitude and frequency are proposed for detection and elimination of the rabbit ear effect. Proposed methods are tested at the center and at the edge of the channel for signals that have different pulse width. Suggested methods detected and eliminated most of the rabbit ear signals. This design which can be easily performed on real time signal processing systems is implemented on FPGA board that samples in 2.5 GHz. Experimental results of the methods are presented.