Abstract: 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.

Abstract: 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.

Abstract: A method and apparatus for reducing electromagnetic interference (EMI) and jamming in Global Positioning System (GPS) receivers operating on rolling or spinning platforms and/or environments is provided. An antenna system having a pair of diametrically-mounted elements provides interferometric cancellation for spatial and polarization nulling of interference signals. The antenna system, operating in conjunction with multiplexing and anti-jamming electronics, provides interference suppression for a GPS receiver connected thereto. Interference cancellation is provided in jamming and non-jamming environments by selectively employing spatial or polarization nulling of the interference signal.

Abstract: A method and apparatus for reducing electromagnetic interference (EMI) and jamming in Global Positioning System (GPS) receivers operating on rolling or spinning platforms and/or environments is provided. An antenna system having a pair of diametrically-mounted elements provides interferometric cancellation for spatial and polarization nulling of interference signals. The antenna system, operating in conjunction with multiplexing and anti-jamming electronics, provides interference suppression for a GPS receiver connected thereto. Interference cancellation is provided in jamming and non-jamming environments by selectively employing spatial or polarization nulling of the interference signal.