DIGITIZER FOR CONVERTING ANALOG IMAGE SIGNAL TO DEGITAL IMAGE SIGNAL IN RADAR APPARATUS

摘要

The present invention relates to a digitizer for a radar image converter. The digitizer according to the present invention includes video signal amplifying means for amplifying an analog radar video signal into a positive radar video signal; A tongue tongue reflection wave removing means for removing an image caused by the tongue tongue reflection wave from the radar image signal output from the image signal amplifying means in accordance with the selection signal of the signal attenuation level applied to the microprocessor; Automatic gain adjusting means for receiving a radar image signal output through the tongue tongue reflection means and automatically adjusting gain to output an average DC value of a predetermined threshold level; Surface reflection wave removal means for generating a slow-type pulse for removing an artifact caused by the surface reflection wave from the image signal output from the automatic gain adjustment means in accordance with the selection signal of the signal attenuation level applied from the microprocessor; An adder in which a slow pulse type generated by the surface reflection wave removing unit and a signal output by the automatic gain adjusting unit are synthesized and applied to an input terminal, and a bias voltage is changed according to a threshold control signal applied from a microprocessor; ; And a comparator comparing the signal output from the adder with the signal output through the tongue tongue reflection means and detecting only an image target signal larger than the signal output from the adder from the signal output through the tongue tongue reflection means. .