| 摘要 |
PURPOSE:To eliminate the influence of back to back phenomenon by allocating and displaying B mode video signal, pulse MTI video signal and CWMTI video signal according to the sound ray direction or distance where a moving body is present. CONSTITUTION:In B mode sequence, a wave receiving signal is inputted to a B mode system circuit 23 to form an instantaneous level signal of an echo, which is stored in a temporary memory device 29 as white brightness data. In PMTI sequence, it is entered in a PMTI system circuit 24 and outputted as an output level signal of a pulse MTI filter. The Doppler shift information by PMTI is stored in the temporary memory device 29 as hue data. In CWMTI sequence, the wave receiving signal is subjected to signal processing in a CWMTI system circuit 25. The output signal is stored in the temporary memory device 29 as the hue data. When a switch 28 is turned to the CWMTI side, the position of a moving body is judged with the output level of the MTI filter of the PMTI system circuit 24 as brightness, and recognized by the hues different according to the extent of the Doppler shift of its motion. |
