METHOD AND APPARATUS FOR EXCISION OF NARROWBAND INTERFERENCE SIGNALS IN NAVIGATION OR COMMUNICATION BANDS

A method for suppressing narrowband interference signals is provided. The method comprises inputting a digitized signal to a fast Fourier transform (FFT) to produce a plurality of contiguous frequency bins, examining said frequency bins to identify those bins containing narrowband interference above an excision threshold as excise bins, excising said excise bins to leave residual bins, implementing a lower resolution FFT analysis receiver to monitor broadband components and to mask out the narrowband interference excised in the excising step, reconstructing the signal with said residual bins using an inverse fast Fourier transform (IFFT), and outputting said reconstructed signal to a receiver as a protected signal having improved signal characteristics through reduced narrowband interference. The protected signal is used to produce enhanced operation in said receiver.