For guns radar just need to track the target.
Yes, there is a muzzle velocity measuring system on one of the barrels for both guns that consists of two coils. The other gun has a shield to prevent rounds leaving that barrel from interfering in the signal. This means that the muzzle velocity is added to the ballistic computations as the guns are fired to improve accuracy.
Of course most people think a cannon firing at long range will hit one place but after travelling 2-3km the shell spread looks more like someone threw a bucket of water rather than a single laser beam of hits. This spread improves hit probability and makes it more effective in its role than a more accurate gun. It is the same reason that when shooting small fast moving targets that hunters prefer shotguns to rifles.
You are quite lucky to find this book.
It is actually getting a bit old now, it is "Russia's Arms 2004".
They released a newer version called "Russia's Arms 2007" which I will get around to buying some time, but they have promised a "Russia's Arms 2011" that will have lots and lots of all the new stuff that is being developed and will be available soon for sale, which I am really looking forward to.
Publishers webpage is http://www.milparade.com/
Keep in mind it is made up of information direct from the makers so the information is not guesses, unlike western publications I used to rely on, but of course they wont detail problems or even if they are able to mass produce the item yet or not. Just lists purpose and best features... which is good enough for me.
By those words I think night channel in Tunguska-M1 optical sight is image intensifier not thermal imager, that is why they talk about optical visibility. After all 3th gen II tubes are small enough to install inside optical sight and have enough intensifying power (30.000 to 50.000x), that they could, without any problems, work in moonless nights, just starlight.
Well, looking at the wording they used, I am inclined to agree with your logic. Of course the Russian Army on paper has lots of night vision equipment but it is really only their special forces that actually operate at night AFAIK.
I would expect that thermal sights might be assured for the new Tunguska version with Pantsir radars and systems added. IN fact I think I have seen that model... because the Tunguska needs to fit crew inside perhaps they have moved the Thermal and optical system of Pantsir outside the turret... check out these two pictures of prototypes I found some time ago.
One has a new search (rear) radar and a new front tracking radar plus a module on the turret roof with some sort of missile guidance transmitter and thermal and TV optics in two windows... presumably the new tracking radar could guide to one or more targets (if it is a phased array it could possibly track 2-3 targets and guide missiles towards them) plus the transmitter on the new module would allow guidance of missiles at optically tracked targets too... perhaps one at a time?
The other picture shows a cheaper setup with the search radar (rear) replaced with a new phased array antenna and the front tracking radar removed completely and replaced with the roof module fitted to the other vehicle. This would mean that it could track and engage fewer targets, but also that it would emit much less radar waves and be less effected by jamming and ARMs. It would also be a lot cheaper with one less radar system.
And here is a third setup that has the new search radar, the roof mounted optical/thermal module plus another system that appears optical replacing the tracking radar...
Maybe it is a laser target marker and those missiles are SOSNA-R missiles, or perhaps it means the vehicle can use SOSNA-R and all the current missile types for Tunguska and Pantsir. The SOSNA-R missiles are supposed to be cheaper... here is a dedicated SOSNA-R vehicle:
-Edit- Just noticed that some of the vehicles are the standard Tunguska vehicles but one is a BMP-3 chassis and the SOSNA-R system is mounted on the MT-LB.
As far as I know the chassis for the Tunguska is made in Belarus...