IRST makes CM pointless

You can’t expect to be invulnerable just by spamming chaff/flares

Video one: not effective notch angle and insufficient defensive manuevering.

Video two: low, slow, and too close to the battlefield to adequately affect any IRST tracker and avoid AAA fire.

There’s more to CMs then pressing periodic release. You need to do more than what you’re doing here.

It’s something called an electro-optical tracking system, and is common on SPAAs and IFVs from the 90s onwards. The “IRST” is a thermal sight used to track the angular position of the target. Sometimes it’s paired with an actual IRST with a wide FoV (typically for SPAA) but on many vehicles it’s simply the gunner’s thermal sight. A laser rangefinder, typically the one connected to the gunner’s sight, then ranges the locked target. The targeting computer then combines the range of the target with its angular velocity (based on the thermal sigh’s record of its angular position) to calculate its true velocity, as well as time to impact of the cannon based on range and muzzle velocity, and from that, the lead required.

I wasn’t trying to avoid the AA, I wanted them to target me, I was watching to see what they locked on to and needed to see the rounds, As you could see I didn’t have any weapons I was merely gauging how CM affected the AA fire.

My point

Seems like a fairly pointless exercise.

I assume this is a joke.

Some do use a laser rangefinder to gauge the range. Some don’t use a laser at all and can’t gauge the range (ex is the 2S6 for the later).

Anyways there isn’t really any counter to IRST unless you pre flare I think. The only option is to not get within their range.

I know this thread is quite old. But seeing you have a very good understanding of this, I have 1 question.

Or for anybody here that might know.

Why does the FOV on SPAA with IRST, shrink the more vertical you look. As far as I’m aware, the sight itself isn’t locked to 1 plane (like on an aircraft) and only has a certain FOV to work with. The sight itself on almost all SPAA can move freely in any direction, the limit is just what angles the sight can see up too.

The higher you look on vehicles with IRST, the more vertical the IRST becomes, so thin that what you could track from ~12 or ~20kms away horizontally, you can barely reach ~8km vertically, or less.

The M163 has a similar effect, except… it only has a tracking radar, no IRST, but the FOV shrinks tremendously the farther up you look, but if you incline the vehicle to where it’s literally on it’s back, the FOV is the same as if it was on level ground.