Source: https://www.youtube.com/watch?v=4X1PRDbtiF0
The above video is an attempt to demonstrate how a system mounted like the ATFLIR targeting pod:
A) requires a derotation mechanism
B) require major camera movements around 0°
It's a tricky thing to explain, and I anticipate this thread getting somewhat detailed and technical, but unless Raytheon wants to weigh in then some digging will be required to figure out exactly what is going on with this rotating glare.
What I'd like to do is collect as many references as possible that address this issue, to help paint a better picture.
One interesting patent I found is US9121758 - "Four-axis gimbaled airborne sensor having a second coelostat mirror to rotate about a third axis substantially perpendicular to both first and second axes" held by Raytheon, which has this interesting discussion on the need for derotation:
https://patents.google.com/patent/US9121758
And also the issue near the 0° position, referred to to as "gimbal lock" or "gimbal singularity"
The mention of +/- 3° is particularly interesting, as all the major apparent motion of the object happens between -3° and +4°
The above video is an attempt to demonstrate how a system mounted like the ATFLIR targeting pod:
A) requires a derotation mechanism
B) require major camera movements around 0°
It's a tricky thing to explain, and I anticipate this thread getting somewhat detailed and technical, but unless Raytheon wants to weigh in then some digging will be required to figure out exactly what is going on with this rotating glare.
What I'd like to do is collect as many references as possible that address this issue, to help paint a better picture.
One interesting patent I found is US9121758 - "Four-axis gimbaled airborne sensor having a second coelostat mirror to rotate about a third axis substantially perpendicular to both first and second axes" held by Raytheon, which has this interesting discussion on the need for derotation:
https://patents.google.com/patent/US9121758
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