Вот так вот описан процесс наведения в англоязычных скрижалях:
For FAAD, they decided to use a beam riding. This had been used in early missiles like the RIM-2 Terrier, but had been abandoned in favor of semi-active systems for all of the reasons above. In particular, in the case of beam-riding the signal is shaped like a cone centered on the broadcaster, which means it becomes increasingly inaccurate as the missile flies towards the target. Some sort of secondary terminal guidance system was almost always needed with beam-riding weapons.
In spite of these disadvantages, beam-riding offered FAAD the ability to guide the missiles in close proximity to the ground. Since the guidance signal is received at the rear of the missile body, the signal would remain clear as long as there were no obstructions between the missile and launcher. It was only the [launch platform] that had to have the ability to distinguish targets from ground clutter, which was easier to do with a larger workspace and more power. FAAD used a continuous wave radar, which uses the Doppler shift of the moving targets to locate them against any sort of background. For terminal guidance, FAAD used an advanced infrared homing system.
Given the quick engagement times, on the order of seconds, the Army decided that FAAD had to have semi-automatic actions. In combat, the operators would select targets on a long-range search radar and then simply say “go” to attack them. The system’s [fire control computer] would slew the weapons and fire automatically as soon as they came in range.