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this post was submitted on 30 Apr 2024
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The sensor is just a 128x96 monochrome camera and it's fairly trivial to programmatically determine where IR lights are at in the frame. The processor just needs to scan through 12,288 pixels, find the center of a cluster of bright pixels and return coordinate. It's not a complex operation, but the devil is in the details: I suspect you would still need to overclock the hell out of it to process over 60fps. Manpads are fast with the Stinger clocking in at about mach 2. As the missile gets closer to the target, it wouldn't take much of a delay to screw things up.
So sure, if you spend the cash on a quality glass, you could do a ton with that sensor. It's probably years ahead of what was on the original Stinger, actually.
It might work, but the use-cases are extremely far apart here.
Also the accelerometer only goes to some 3.4 G which you get really easily.
I had a whole paragraph about that, but deleted it. The question focused on the IR sensor and processor so that put many other components out of scope.
Consumer grade MEMS sensors would probably just implode at those forces, but I can't really speak to that.
Edit: While I was thinking more about this, it makes complete sense that any circuits would be analog, especially for that time period. With military hardware, durability and reliability is paramount**, so a stinger probably would use something way less complicated than a camera. I don't know for certain, but that is most of the magic of military tech in general.
** lol. I actually said that. Replace "reliability" with "survivability" and that sounds cooler.
IR homing sensors before the digital age where a piece of analog signalpath art. Its mostly rotating a singular ir sensor in 45degree and then mapping the inputs rotation compensated to the control surfaces. Simple at core but cant tell the difference between a jet exhaust, the sun, or a flare.
Modern version are boring is a High resolution ir cam and some blackmagic AI picking targets apart from flares.