Interference mitigation by dynamic false rate

A radar system comprising:

• receive antennas that receive a radar signal;
• and
• one or more processors configured to perform acts comprising:
• processing the received radar signal with analog signal processing circuitry;
• digitizing the processed radar signal using at least one analog-to-digital converter (ADC) to generate radar data;
• executing, by a digital signal processor, a range fast Fourier transform (FFT) and a Doppler FFT on the radar data to generate range and Doppler data values;
• selecting one or more training cells for noise power estimation based upon the radar signal received at the receive antennas;
• calculating a mean noise power value for the one or more training cells;
• for each of the one or more training cells, calculating a deviation value by determining a difference between the noise power of the training cell and the mean noise power value;
• calculating a standard deviation of the deviation values for the one or more training cells;
• determining a trained probability of false alarm (PFA) threshold offset by multiplying the standard deviation by a scaling factor k, wherein k is obtained from an inverse cumulative distribution function corresponding to a desired PFA estimating a PFA threshold to be applied for a non-training cell;
• setting a current PFA threshold offset;
• comparing the current PFA threshold offset to the trained PFA threshold offset and a guard interval offset;
• replacing the current PFA threshold offset with the trained PFA threshold offset only when an absolute difference between the current PFA threshold offset and the trained PFA threshold offset exceeds the guard interval offset;
• controlling the analog signal processing circuitry to mix a radar signal with a carrier signal to shift a center frequency of the radar signal and to hop between frequency subbands used for transmission and receiving, and to perform amplification operations on radar signals output by the receive antenna;
• digitizing the radar signal after said mixing and amplification using at least one analog-to-digital converter (ADC) to generate radar data;
• executing, by a digital signal processor, a range fast Fourier transform (FFT) and a Doppler FFT on the radar data to generate range and Doppler data values;
• applying a cell-averaging constant false alarm rate (CA-CFAR) detection routine to the radar data using an adjusted PFA threshold offset;
• and
• populating one or more multi-dimensional point clouds with a detected target cell corresponding to in the non-training cell.

A radar analysis system comprising:

• one or more processors configured to perform acts comprising:
• processing a received radar signal with analog signal processing circuitry;
• digitizing the processed radar signal using at least one analog-to-digital converter (ADC) to generate radar data;
• executing, by a digital signal processor, a range fast Fourier transform (FFT) and a Doppler FFT on the radar data to generate range and Doppler data values;
• selecting one or more training cells for noise power estimation based upon a radar signal received at one or more receive antennas;
• calculating a mean noise power value for the one or more training cells;
• for each of the one or more training cells, calculating a deviation value by determining a difference between the noise power of the training cell and the mean noise power value;
• calculating a standard deviation of the deviation values for the one or more training cells;
• determining a trained probability of false alarm (PFA) threshold offset by multiplying the standard deviation by a scaling factor k, wherein k is obtained from an inverse cumulative distribution function corresponding to a desired PFA;
• estimating a PFA threshold to be applied for a non-training cell;
• setting a current PFA threshold offset;
• comparing the current PFA threshold offset to the trained PFA threshold offset and a guard interval offset;
• replacing the current PFA threshold offset with the trained PFA threshold offset only when an absolute difference between the current PFA threshold offset and the trained PFA threshold offset exceeds the guard interval offset;
• controlling the analog signal processing circuitry to mix a radar signal with a carrier signal to shift a center frequency of the radar signal and to hop between frequency subbands used for transmission and receiving, and to perform amplification operations on radar signals output by the receive antenna;
• digitizing the radar signal after said mixing and amplification using at least one analog-to-digital converter (ADC) to generate radar data;
• executing, by a digital signal processor, a range fast Fourier transform (FFT) and a Doppler FFT on the radar data to generate range and Doppler data values;
• applying a cell-averaging constant false alarm rate (CA-CFAR) detection routine to the radar data using an adjusted PFA threshold offset;
• and
• populating one or more multi-dimensional point clouds with a detected target cell corresponding to in the non-training cell.