High-power Interference Canceller with Optional Self-generated Reference

PSI proposes a new signal interference cancellation technique, which can be integrated into existing SIGINT receiver systems, that permits signal detection and processing in the presence of high-power cosite interferes, which may be transmitting at the same time and/or on the same/nearby frequencies as the signal(s) of interest (SOI). The new PSI canceller is inserted between the antenna and RF input of any system. The PSI approach uses cancelling of the interfering signal instead of timing, filtering or attenuation to reduce its deleterious effects. The canceller cancels only the high-power interfering signal(s), leaving the desired SOI unaffected. The approach operates continuously and does not require operational time-sharing between the SIGINT receiver and the high-power transmitter. Consequently it is effective against a non-cooperative interfering transmitter. Hence a SIGINT receiver can operate continuously with full capability in the presence of strong interfering signals that are operating on the same or nearby frequencies. The new PSI canceller is broad bandwidth, can improve the signal-to-interference ratio by>>10 dB and has a fast response. The new PSI canceller can be applied to existing and future tactical mounted and dismounted systems with severe size, weight and power (SWaP) constraints, in a cost effective manner.