Abstract: A video extractor for a pulse radar apparatus comprises a memory capable of storing a number of words corresponding with the number of range quanta, into which the range interval of the pulse radar apparatus is divided. The rate at which words are shifted in and out of memory corresponds with the counting rate of the range counter of the pulse radar apparatus. A video processor updates the target information in the words in response to video, angular and range data from the pulse radar apparatus. The target information contains at least the initial azimuth value jb(r), the final azimuth value je(r), the weight E(r) and the target number N of a series of hits established in the range quantum r. A processor, receiving at least the above information from the video processor determines the center (MR, M.phi.), the direction .0., the length L, the width B and the weight E.sub.o of the target.

Abstract: For a threshold circuit for radar video signals the radar coverage is divided into zones constituted by azimuth sectors and range rings, the zones being subdivided into cells formed by radar scans and range quants. The threshold circuit contains a first cell-averaging circuit (1) for determining the average echo strength in each zone pertaining to the azimuth sector that has been scanned by the radar beam. A first zone-averaging circuit (5) is connected to the first cell-averaging circuit (1) for determining from(1) the last established average echo strength of a zone,(2) the average echo strength of said zone as established after the previous scanning of the relevant azimuth sector by the radar beam, and(3) the average echo strength of zones adjoining in azimuth and range,a new average echo strength of the zone.