FREQUENCY AVERAGING CONTROLLED FALSE ALARM RATE (CFAR) CIRCUIT

摘要

A frequency averaging CFAR circuit having a digital filter bank for receiving radar doppler echoes that are conducted sequentially into serially connected metal oxide semiconductor (MOS) type delay shift register networks with the outputs of shift registers on opposite sides of a center frequency register being summed to produce an average value applied to a threshold circuit together with the output of the center frequency register output to cause the threshold level to vary in accordance with the averaged noise and clutter signals and to detect a target signal whenever the output of the center frequency register exceeds the threshold.