What I observed during the engagement (several variants tested), was that it's hard to lock the angle even when the reflection brightness is easily distinguishable at SDC. What's more, the only way to maintain the lock is to switch SDC off at some stage (I suspect that's due to low radial speed of the target - described in the manual) - but how the lock is being maintained when target and ground reflections become impossible to distinguish? Did you incorporate a kind of "intelligent tracker"?
Correct. Low radial speed of the target could make target acquisition using SDC impossible.
If the target is on tracking, it is not impossible to track it without SDC.