Patent attributes
A detecting device is provided. The detecting device detects target objects. The detecting device includes a transmitter configured to transmit transmission waves, a receiver configured to generate reception signals from reflection waves of the transmission waves, a target echo signal detecting module configured to detect target echo signals among the reception signals, a size calculating module configured to calculate a size of each the target objects based on the corresponding target echo signal, and a frequency index value distribution calculating module configured to calculate frequency index values for respective size ranges based on the calculated sizes, each frequency index value being an index of the number of the target objects. The frequency index value distribution calculating module has a first updating submodule configured to update the frequency index value for each size range every predetermined period of time.