openradar : show range and doppler

在 demo/visualizer/realtime.py 有 fft processing 的 code..

   ...
        # (1) Reading in adc data
        adc_data = dca.read()
        frame = dca.organize(adc_data, num_chirps=numChirpsPerFrame, num_rx=numRxAntennas, num_samples=numADCSamples)

        # (2) Range Processing
        from mmwave.dsp.utils import Window
        radar_cube = dsp.range_processing(frame, window_type_1d=Window.BLACKMAN)
        assert radar_cube.shape == (
        numChirpsPerFrame, numRxAntennas, numADCSamples), "[ERROR] Radar cube is not the correct shape!"

        # (3) Doppler Processing 
        det_matrix, aoa_input = dsp.doppler_processing(radar_cube, num_tx_antennas=3, clutter_removal_enabled=True)

        # --- Show output
        if plotRangeDopp:
            det_matrix_vis = np.fft.fftshift(det_matrix, axes=1)
            plt.imshow(det_matrix_vis / det_matrix_vis.max())
            plt.pause(0.05)
            plt.clf()

  ...