the jammer response circuitry of the present invention operates to control correlation circuitry in a gps receiver based on an occurrence of a transmission from a wireless transmitter , thereby avoiding performance degradation in th gps receiver due to interference caused by the transmission . in general , the jammer response circuitry activates a control signal during the transmission , thereby temporarily stopping the operation of the correlation circuitry . more particularly , the accumulation of results of a correlation of a received signal with a generated frequency and a generated code having numerous time offsets is temporarily stopped when the control signal is activated and resumes operation when the control signal is deactivated .