SA-9 and SA-13 Missile flying lead

[Raviar]

as per title, isn't that strange ? is it the correct behavior ?

[draconus]

What? You've got some info that they cannot use proportional navigation?

[Exorcet]

3 hours ago, draconus said:

What? You've got some info that they cannot use proportional navigation?

The question is reasonable if you don't know much about missile guidance. I don't think Raviar is making any claims but only asking for clarification.

IR missiles can't measure distance so it might not be clear how they determine lead. Proportional Navigation relies on line of sight, so range isn't needed. This allows IR missiles to lead their target without a radar or range finder. So it is possible for the mentioned the missiles to fly lead, although if they are completely accurate compared to the real missiles, I don't know myself.

[ngreenaway]

@Raviar

From Wiki:

"A missile (blue) intercepts a target (red) by maintaining constant bearing to it (green)"

 

 

Heres a good resource:

https://www.scienceabc.com/innovation/how-guided-missiles-work-guidance-control-system-line-of-sight-pursuit-navigation.html

Edited February 9, 2023 by ngreenaway

[Raviar]

11 hours ago, ngreenaway said:

@Raviar

From Wiki:

"A missile (blue) intercepts a target (red) by maintaining constant bearing to it (green)"

 

 

Heres a good resource:

https://www.scienceabc.com/innovation/how-guided-missiles-work-guidance-control-system-line-of-sight-pursuit-navigation.html

 

I believe this is relevant for Radar Terminal Guidance and not Heat seeking missile such as 9M31. I got my answer by @Exorcet
Thanks

[ngreenaway]

3 hours ago, Raviar said:

I believe this is relevant for Radar Terminal Guidance and not Heat seeking missile such as 9M31. I got my answer by @Exorcet
Thanks

 

Its literally the same thing. the diagram i showed you is featured on the AIM-9 wiki page . @Exorcetdescribed proportional navigation, and i illustrated it

see for yourself:

https://en.wikipedia.org/wiki/AIM-9_Sidewinder

https://en.wikipedia.org/wiki/Proportional_navigation

Edited February 10, 2023 by ngreenaway

[GGTharos]

3 hours ago, Raviar said:

I believe this is relevant for Radar Terminal Guidance and not Heat seeking missile such as 9M31. I got my answer by @Exorcet
Thanks

It's relevant to all missiles using proportional navigation; typically that's what a homing  missile will use.   Radar or IR doesn't matter here.   In this case, radar can add information (closure, target vector) to make the homing even more capable, but in both cases the missile will go into a collision course.

Even beam-riders and SACLOS missiles can go for collision - you need the right instrumentation to compute intercept and point the missile in the right direction, but there's no need to assume that anything will be doing pure pursuit until you see that it does.

Edited February 10, 2023 by GGTharos