DIGITAL INTERMEDIATE FREQUENCY SIGNAL PROCESSING DEVICE CAPABLE OF SENSING A JAMMING SIGNAL, CONCERNED WITH REALIZING A JAMMING SIGNAL DETECTION FUNCTION FOR A RECEIVED FREQUENCY BAND

PURPOSE: A digital IF signal processing device capable of sensing a jamming signal is provided to add an additional DSP by using a multi-carrier signal processing method, and to use the added DSP when scanning a frequency band assigned to the added DSP. CONSTITUTION: An RSSI detector comprises as follows. An NCO(Numerically Controlled Oscillator) converts an oscillating frequency, and outputs a cosine wave. The first mixer(232) mixes a sine wave of the NCO with a digital IF signal outputted from an analog/digital converter. The second mixer(233) mixes the cosine wave with the outputted digital IF signal. The first and second interpolation and finite impact response filters(234,235) increase an SNR and precision of data, and filter/output the digital data. A digital AGC(236) automatically controls gains of signals outputted from the filters(234,235), and outputs result values as RSSI values for deciding whether a jamming signal is generated.