Patent ID: 11936418
Assignee: KAIKUTEK INC.
Field: Measurement (Instruments)
Classification: CPC H  G | IPC G  H

Claim 0:
1. A radar signal processing system with a self-interference cancelling function, receiving an original input signal through a receiver antenna, and comprising:
a control input end, receiving a control signal;
a signal input end, electrically connected to the receiver antenna and receiving the original input signal;
an analog front end (AFE) processor, electrically connected to the signal input end, and performing a front end process according to the original input signal and generating an analog input signal;
an analog to digital converter (ADC), electrically connected to the AFE processor, and converting the analog input signal to a digital input signal;
an adaptive interference canceller (AIC), electrically connected to the ADC, performing an adaptive interference cancellation process to the digital input signal, and generating a digital interference signal; and
a digital to analog converter (DAC), electrically connected to the AIC, converting the digital interference signal to an analog interference signal, and outputting the analog interference signal to the AFE processor; wherein
the AFE processor cancels the analog interference signal from the original input signal while performing the front end process, and comprises:
a trans-impedance amplifier (TIA), electrically connected to the signal input end, and receiving the original input signal,
a programmable gain amplifier (PGA), electrically connected between the TIA and the ADC; wherein the original input signal is transformed to the analog input signal through the TIA and the PGA, and the analog input signal is outputted to the ADC from the PGA,
a first feedback unit, wherein the TIA is connected to the signal input end through the first feedback unit,
a second feedback unit, wherein the PGA is connected to the TIA through the second feedback unit, and
a first switching module, connected to the DAC and the control input end, having a first output end and a second output end, wherein the first output end is electrically connected to the first feedback unit, and the second output end is electrically connected to the second feedback unit;

when the control signal is a first value, the first switching module outputs the analog interference signal to the first feedback unit, and the first feedback unit cancels the analog interference signal from the original input signal, and outputs the original input signal after the cancellation to the TIA; and
when the control signal is a second value, the first switching module outputs the analog interference signal to the second feedback unit, and the second feedback unit cancels the analog interference signal from the original input signal received from the TIA, and outputs the original input signal after cancellation to the PGA.