I think that SAMSIM is coded like this, just not sure, what you mean on...
- bisector line
- when this angle became less than 8 degrees (why 8?)
- the 4 degree limit mark (why 4?)
... please describe these in drawing, that I could understood it more clearly.
OK. I'll do a last try (I am not good in drawings I used those from Vadifon)
This is full lead method (middle). Missile goes straight to the point of impact:
Bottom of picture - a half lead. So if we got
HALF instead of
FULL lead, the missile must fly with the half lead instead of full one (measuring it like an angles).
From the other side, due to transmitor/receiver limitation (and overload capability of the missile IMHO), the maximum lead angle for the missile is
4 degrees.
So, let's imagine that after targeting an object, the system will calculate that point of impact will be at, say,
10 degrees off our bore-sight (
SNR-Target line). So if the system worked with a FULL lead method, the missile would go straight at the point of impact (
SNR-Point of Impact line - no target maneuvers, no height/speed change). So, the angle between those 2 lines is 10 degrees.
In HALF lead mode, the missile gonna follow the HALF of the FULL lead angle (the bisector of the angle) which divided the FULL lead angle on two (on HALF), which in our case is
5 degrees (10/2).
But we got the limitation of
4 degrees lead, so initially, the missile will go with
4 degrees, and it will keep this lead UNTIL the later moment+1 when our boresight line (
SNR-Target line) during it's rotation in the side of the initial
SNR-Point of Impact line, decreases the initial FULL lead angle from
10 degrees to
8 degrees... At this moment the bisector (needed HALF lead angle would be equal to the max. limit, allowed by SA-2 engineers and with further decreasing of this angle, the required lead in HALF LEAD mode will be less than max. lead limitation, i.e. the missile should leave the 4 degrees line a bit earlier than in this pictures:
http://simhq.com/forum/ubbthreads.php/topics/3954597/Re:_Bug_reports#Post3954597
