Plot generator.

摘要

The invention relates to a method to be used in an air space surveillance radar for selecting target data by comparing the target azimuth extent data with the zone-related threshold. A plot generator comprising a video processor (2) produces, upon the reception of sensor signals, target data per target, which data are stored in a register (3). The method aims at protecting the track generator from overloads and is characterised by the following process steps:
a. to separately store a target azimuth extent threshold for each range-azimuth zone;b. to convert target angle and range data into a zone-related address control signal;c. to read out the zone-related threshold;d. to compare the target azimuth extent data supplied by the video processor (2) with the read-out threshold;e. to produce an erase signal for the register-stored target data if the supplied target azimuth extent data fails to exceed the threshold.