Suppression of co-channel interference in high duty ratio pulsed radar receivers

This paper describes a technique for the suppression of interference, particularly co-channel components arising from interference on neighbouring channels, within a pulsed radar receiver operating on a high duty ratio. The technique employs two RF switches with a band pass filter between them and nesting the gating control of the second switch to lie within the gating control of the first switch. Simulations indicate that rejection of in-band interference components arising from interference that is offset by 60MHz from the channel centre frequency some 20dB greater than that of a conventional filtering is possible. The technique is most effective at high duty ratios.