Abstract: A line correlator for use as a pattern matching device in a high resolution radar system. Binary coded a priori target area information is digitally correlated with binary coded video range trace signals for a plurality of range and azimuth sets in parallel or multiplexed channels (representing an area of interest), the quantitative correlation for each set being stored. Upon determination of the comparatively better correlation coefficient, the associated range and azimuth data set are retrieved and may be employed for terminal guidance purposes.