Antenna pattern generation using digital circuits

In Radar Simulation technique, the simulated video echo pulses are mixed with low frequency noise (clutter) and gated over the scan interval; they are also subjected to amplitude modulation in proportion with the antenna pattern envelope swept during the scan time. Conventionally, a mechanical antenna pattern genarator or a Cathode Ray Tube Photoform Function Generator is used to obtain the modulating signal. This paper describes two relatively simple methods, using digital circuits, of obtaining the antenna patterns.