Iranian_Patriot
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What is thé adress if the defense ministry catalogue ?I updated my Bavar-373 article with analysis of the new information, text is below. Full article at https://irangeomil.blogspot.com/2019/08/irans-bavar-373-profile.html
Update 4th January 2022
Bavar-373 has appeared on the Ministry of Defence's export page as AD-200, with a detailed specsheet improving public understanding of the system, specifically the Sayyad-4 missile.
The missile's basic proportions are very close to the 48N6E2 missile used in the S-300PMU2. Sayyad-4 has a large 180kg warhead, the same as its Russian counterpart. It has the same airframe diameter and length (not including aerodynamic control surfaces) as the 48N6E2, but is 150kg heavier at 2050kg. Despite this, it has a 200km range to the 48N6E2's 195km. This kinematic performance is quite impressive considering the extra weight, and it is reasonable to assume that later versions of the Sayyad-4 will reach similar performance to the more mature 48N6E3.
The main difference between the two is the seekers. The 48N6E2 found on the S-300PMU2 already had a very robust mode of guidance called SAGG. With the release of the specsheet, this guidance mode can also be confirmed on Sayyad-4, which has "Inertial + Update Via Data Link Semi-active". On its own, that description would describe at least a TVM system as used on the MIM-104 Patriot PAC-2. TVM sends receiver data back to the ground radar via a datalink. The ground radar then calculates the appropriate guidance commands and sends these back to the missile.
However, the specsheet says "Semi-active/ Active Radar Homing". Active Radar Homing uses a self-contained radar set which none of the 48N6 series use. ARH on long-range missiles is a feature also used on the 40N6 missile of the S-400. This also confirms that Sayyad-4 would have onboard computation, making it capable of SAGG. SAGG is best described as a more robust form of TVM, because in addition to the raw receiver data sent to the ground radar, the missile can calculate its own guidance commands, which can be datalinked to the ground radar to check for errors between the missile-computed commands and the ground radar commands. The missile can also act on its own if guidance commands from the radar are being jammed but the target is still being painted by the ground radar.
However, when defending against the S-300 or Patriot series, a defending aircraft could hide below the horizon or behind terrain to break line of sight with the ground radar. This would defeat even SAGG, which is fundamentally a SARH-based guidance mode relying on line of sight. By including an active seeker, Sayyad-4 has the ability to guide on to the target even if line of sight to the ground radar has been broken in the little time the target has to react. The use of inertial guidance also allows the ARH mode to be used based on the target's predicted flight path at the time the radar lock was broken. This is particularly useful in Iran's mountainous terrain, but also makes Bavar-373 potent in naval applications where most targets will drop to very low altitude in the final phases of flight. Bavar-373 has clearly been designed for maximum resilience against jamming and reducing the ability of the target to defend to an absolute minimum.
