| 摘要 |
PURPOSE:To enable one tracking by performing distance tracking at a high speed and discriminating target separation, by comparing the output of a high sped distance counter with tracking gate position data set by a microcomputer to output a target distance in the form of a distance numerical value and a tracking gate form. CONSTITUTION:The output of a high speed distance counter 10 counting the clock of a clock generator 9 started by a transmission trigger is compared with the set tracking position gate of a microcomputer 27 by a distance comparator 1. When both of them coincide, a tracking gate pulse having a width including a target is outputted from a tracking gate generator 12 and converted to a high accuracy tracking gate width by a shift register 13 and a change-over circuit 14 for changing over a shift amount and a gate 20 is controlled by this width and the video signal passing through an A/D converter 25 is compared with a set threshold value by the microcomputer 27 while a video signal center value is detected by a lock-on detection circuit 24 to track a target distance at a high speed. In the similar way, two targets are separated by two sets of gate pulse widths and front and rear targets are selectively tracked corresponding to the indication of the microcomputer 27 through FF 18, a gate 22 and FF 19. |
