The application of a nonlinear inverse noise cancellation technique to maritime surveillance radar

A method, referred to as Broomhead's filter method, is reviewed. This method uses a nonlinear inverse to a linear bandstop filter to obtain better noise reduction results, in terms of signal to noise ratio, than linear noise reduction techniques, for the cancellation of wideband chaotic noise from a sinusoid. A novel and unorthodox approach is suggested for the linear bandstop filtering aspect of Broomhead's filter method, which allows it to be applied in situations where the signal of interest has a broader spectrum than that of a sinusoid. This unorthodox approach, referred to as the modified Broomhead filter method, is used to cancel chaotic noise and sea clutter from narrowband Gaussian signals of interest.