Interference detection and rejection in a communication/navigation narrowband and wideband radio

A method for signal interference detection and rejection, the method comprising

• providing a radio receiver onboard a vehicle for receiving one or more radio frequency (RF) signals, the radio receiver comprising a plurality of tunable RF notch filters that receive a desired RF signal and reject an interference signal, and a processor operatively coupled with the tunable RF notch filters;
• wherein the radio receiver includes an interference detection path comprising:
• a mixer that converts the received one or more RF signals to an intermediate frequency (IF) band;
• a surface acoustic wave (SAW) filter in communication with an output of the mixer, wherein the SAW filter rejects any IF signal generated due to the one or more received RF signals;
• and
• an RF detector in communication with an output of the SAW filter;
• wherein the processor includes a level detector and interference frequency finder module that performs an interference detection and rejection method comprising:
• estimating an interference frequency based on a detected amplitude of signal samples from an analog-to-digital converter (ADC) and a synthesizer tuned frequency for the detected amplitude;
• if the detected amplitude of the signal samples is more than a threshold defined limit, sending a control signal to configure the RF notch filters at the interference frequency.

A method for signal interference detection and rejection, the method comprising

• providing a radio receiver onboard a vehicle for receiving one or more radio frequency (RF) signals, the radio receiver comprising a plurality of tunable RF notch filters that receive a desired RF signal and reject an interference signal, and a processor operatively coupled with the tunable RF notch filters;
• wherein the radio receiver includes an interference detection path comprising:
• a mixer that converts the received one or more RF signals to an intermediate frequency (IF) band;
• a synthesizer in communication with an input of the mixer, the synthesizer in communication with the processor;
• a surface acoustic wave (SAW) filter in communication with an output of the mixer, wherein the SAW filter rejects any IF signal generated due to the one or more received RF signals;
• an RF detector in communication with an output of the SAW filter;
• and
• an analog-to-digital converter (ADC) in communication with an output of the RF detector;
• wherein the processor includes a level detector and interference frequency finder module that performs an interference detection and rejection method comprising:
• estimating an interference frequency based on a detected amplitude of signal samples from the ADC and a tuned frequency from the synthesizer for the detected amplitude of signal samples;
• if the detected amplitude of the signal samples is more than a threshold defined limit, sending a control signal to configure the RF notch filters at the interference frequency.