1. Could the Bavar's twin radar arrangement also designed to make use of this bi-static concept? If so, how?
Not bistatic but multi-aspect yes. The would need to operate in the same band to be able to set up a kind of bi-static system but their benefit is that they operate in two different bands simultaneously in real-time.
A bi-static effect happens with the likely SAGG guided Sayyad-4, like it theoretically happens with the S-300 and Patriot.
The Bavar can hover use multi-aspect effect agaist stealth targets: For that the radars need to be placed at distance. The VLO platform will try to put its lowest RCS aspect toward the closest threat emitter and by doing so it can't control the RCS level reflected to the second threat emitter. However if the X-band engagement radar is the second emitter, it may successfully evade it because U.S stealth peaks in effectiveness at X-band. A complex situation... to point the lowest RCS, the location/direction of the threat emitter must be known, but the Bavar radars should have very low side lobes and LPI techniques applied.
2. In bi-static operation, would you agree that having a network of AWACS aircraft over the battlespace would help fight off stealth targets?
Bi-static networks are always fragile. Bi-static effect of an illuminating radar and SARH seeker is very robust.
So you best avoid bi-static networks at the core of your kill chain.
You better avoid assets that require runways in the days of the end of the INF threat and the advent of hypersonic weapons.
AEW would certainly help, best against low flying targets. However if you manage to do it without AEW assets than you are on the robust side.
The criticism to this was that missiles have a limited energy and therefore attack vector that they can approach and detect the target at. Modern datalinks mean tactical aircraft can engage targets with their AAMs without using their own radars, just relying on the AWACS.
That criticism is obsolete, I was too conservative/pessimistic back then. In fact the Bavar will operate like this against stealth: Target detected --> SAM launched towards it --> SAM continuously updated via missile up-link --> radar starts to track target in the last seconds --> SARH seeker tries to find a lock and if the target is very stealthy, this X-band lock will only happen in the last 5km, or in other words lat 2-3 seconds. There will be a threshold at which VLO techniques will not be sufficient, especially at distances like below 5km.
A HAWK locks its seeker at 40km with much lower power and aperture levels... a S-200 at 240km... now imagine the Bavar not achieving a lock at 3-5km against the stealth targets and at such close ranges there is a exponential increase in signal strength.
So no, at those close ranges, not even a -50dB VLO system will remain invisible, especially if the bi-static effect kicks in too.
The art here is to first detect the VLO target and somehow guide the SAM towards it. Here Irans art is the use of a separate S-band "engagement" radar that steals away -20dB from the VLO assets stealth budget due to its wavelength. Those 20dB reduction is enough to detect the VLO target at SAM relevant ranges of 200km. The VLO asset still has -5-10dB RCS reduction due to RAM/RAS and 20-30dB reduction due to shaping techniques (plus another 1-10dB due to ECM if available). So it is not useless at all, otherwise the Bavar track to kill it at 400-500km.
Iran could have gone a wrong path too here: Fear stealth performance as much to believe -20dB benefit are not enough and a high degradation of shaping stealth techniques is required --> go for a VHF-band engagement radar to achieve 30-40dB reduction. Luckily testing and physics showed them that 20db reduction is sufficient for the kill-chain and S-band is the right path that brings many other benefits too.
Your idea of bistatic networked AEW would certainly also work well especially against the CM and terrain masking threats, but needs large efforts and is venerable. It is however good in a offensive airpower concept, operating above enemy airspace.
I still want to see a Iranian fighter or bomber RQ-170 that uses stealth techniques: Stealth offers a huge benefit in X-band and higher and if deployed in the right conditions brings a useful advantage. Russians use it for frontal X-band RCS reduction of the Su-57 to improve it's air-to-air performance.
By that 20dB S-band radars offer against stealth: Give the Mersad a Hafez, the S-200 a Najm-804, the 3rd Khordad a Najm-802B.
PeeD do you think Sayyad 4 has active and semi-active radar homing or it enjoy SAGG??
Hopefully SAGG and I hope not for an active seeker for its normal Sayyad-4 SAM: System economy is of great importance, relying on ARH seekers is the easy way to create a LRSAM. Your system get expensive and you loose bistatic and SAGG benefits. Notching, beaming and self defense barrage jamming becomes possible.
ARH seeker is good for a very long range missile, 250km and above if used for high value targets in low numbers.
they are lying Meraj-4 can track up to 200 targets not 100 maybe they are saying that for those 2 new radars??
6 targets means that the radar must create more than 13 Separate beams: 6 for the missiles, 6 for the targets and the rest for searching. The greatest aspect and biggest breakthrough about the S-400 aside the 350+km SAM component is its capability to attack 12 targets simultaneously. However a less robust que engagement (AEGIS concept) is also possible: You track only the missiles, and begin to track the targets only in the last seconds and then the next ones already on TWS.