TARGET ENLARGEMENT DEVICE FOR RADAR EQUIPMENT OR FISH SCHOOL LOCATOR

摘要

PURPOSE:To eliminate variation in the enlargement quantity of a displayed target even when a detection range is varied by determining an extension addition time for delaying the end of a level indicating target detection corresponding to the number of sampling pulses. CONSTITUTION:A binarizing circuit 11 outputs a 1-bit target signal 12 and the output 12 of a buffer 12 indicates the target detection at a H level. Detection duration is compared with set times of continuity degree setters 17 and 20 by continuity degree detecting circuits 15 and 19. The shortest detection time and extension addition time as objects of comparison are determined by the number of CPs of a clock generating circuit 28 and the number of pulses for decision is determined by the outputs of the continuity degree setters. The continuity degree detecting circuits decide a reflection echo to extended and displayed and the decided object echo has its end delayed by an end delay part 27. Therefore, proper enlargement is performed at the time of both a short detection range display and a long detection range display.