1. A method of processing detected signals from a pulse Doppler radar system for automatically tracking targets, wherein said system has a directional antenna that scans in azimuth repetitively collecting return signals from respective targets during successive scans of the antenna, said method comprising: determining the range and Doppler shift of each return signal exceeding a selected threshold level during each dwell of the antenna to constitute a detected signal; correlating detected signals on successive dwells of the antenna; forming candidate target reports having an unambiguous range and ambiguous ranges in accordance with the number of correlated detected signals; selecting target reports from the candidate target reports, said target reports selected having an amplitude sum of correlated signals meeting a criterion corresponding to a predetermined beam-shaped modulation; and tracking the movement of selected unambiguous and ambiguous range target reports during successive scans of the antenna.