Dilandu
I'm dissatisfied, which means, I exist.
Well, from guidance law perspective it made little difference if target was moving in air or was standing on ground. Aerial target is even simpler in fact due to being point target at low contrast background. Anyways, I might quess that this was simple lead sulfide based AM-modulated seeker, like all those zero and first gen seekers. Still interesting to know if they used some unusual solutions in it.
In theory - yes. On practice, the engineering solutions are quite complex, because both targets & missile are moving in 3D with considerable speed, both linear & angular.