Abstract: An intermediate frequency sidelobe canceller of the kind including a cancellation loop and switch means for sampling and holding correlation weights present in the loop, affording enhanced cancellation and reduced loop lock-on time. This capability is achieved by provision of means for control of the sample-hold switch means so as to limit duration of the sampling interval to an optimum value substantially shorter than the loop stabilization time. Such shorter sampling interval may be either of fixed duration or adaptively controlled in response to one or more loop operating parameters.

Abstract: An intermediate frequency sidelobe canceller with provision for controlling the saturation level of the cancellation loop. Such control is provided by interposition of limiter means at a particular point in the cancellation loop, and it enables the setting or programming of the loop cancellation time constant as desired. It significantly enhances performance and reduces cost of the canceller loop by reducing substantially the signal power levels within the loop and by making the loop transient response essentially constant over a wide range of input power level.