Patent ID: 8350746

Claim:
An anti jamming system comprising: a combiner that is configured to receive an input signal that includes a carrier modulated jamming signal, and a replica jamming signal, and to provide an output corresponding to a suppression of the carrier modulated jamming signal in the input signal, a jamming signal feedback loop that includes: a jamming signal receiver having a phase locked loop (PLL) that includes: a voltage controlled oscillator (VCO) that provides a in-phase and phase quadrature oscillator outputs, a synchronous demodulator having a signal input coupled to the output of the combiner, a carrier input coupled to the in-phase oscillator output, and an output, a phase detector having a signal input coupled to the output of the combiner, a carrier input coupled to the phase quadrature oscillator output, and an output, a loop filter and amplifier that are configured to receive the output of the phase detector and to produce a phase control signal for controlling the VCO; and a jamming signal replica generator that includes a modulator having a signal input that is coupled to the output of the synchronous demodulator and a carrier input that is coupled to the in-phase oscillator output of the VCO, and an output that provides the replica jamming signal.