I won't say the 054A is fully dedicated ASW. You can see from the beginning of the 054A, where the first batch lacks TAS and VDS, that it was meant as a general purpose frigate that was needed to be mass produced to rapidly fill in the need for more modern ships in the PLAN. Go back prior to that, to the 054, and the ship maybe more of a response to Taiwan getting their Lafayette class frigates.
Lets say the 054B is a 40 cell ship. 32 U-VLS for HQ-9 and 8 VLS for ASM.
Lets say then the 052E (like I was discussing with Andrew in another thread) is a modified 052 platform with 80 VLS. The ship deletes the VHF antenna and turns that space for an additional 16 VLS while using the 346B radar of the 055, along with its integrated mast. Call it a mini 055.
Lets say the future 055 is now extended to a 128 VLS ship.
Now you have three tiers with the number of cells well spread out --- 40, 80 and 128.
Guangzhou Huangpu and Hudong Zhonghua won't fit a 052D inside the sheds where they are building the 056 and 054A as well as coast guard vessels.
The 052BG is not a bad idea for using a CODAG two GT and two diesel platform with a reduced radar cost set and U-VLS. The 052 started out as a 4000 ton displacement ship, and the Russian frigates like the Admiral Grigorovich and Gorshkov are both powered by two GTs and two diesels.
It probably would have been more expensive and more work done around that area. The refit was chosen because it was the cheapest and quickest way possible. They don't plan to keep this ship for a very long time. The 051B would have difficulty providing the high quality tracking information needed for guidance of the HHQ-9 as it has no place for the Type 346 radars.
Already the 051B refit has omitted the Type 366 "Bandstand" radar that is used for anti shipping and a common feature with PLAN surface warships, although previous to the refit, it never had one. In that way, it already lacks one crucial radar feature that is found in the 054A. This is actually in paradox because the 051B uses the YJ-12 and needs this radar the most.
How small do I think the supportive radar can be sufficient for the HHQ-9?
Clue is with the new dual back dual band AESA radar spotted on the 075. The first side is an S-band that has a range of 350km. That's in excess of the HHQ-9B's range. The second back is an X-band radar face with a range excess of 100km.
So let us say, you take this radar, and turn that to their fixed four faced equivalent. An integrated mast with four of the X-band radar faces higher pyramid, and the four of the S-band faces below. Think of radars like they are LEGOs, you can take the faces separately, and fixed them into an integrated mast instead.
View attachment 55486 View attachment 55487
This set is smaller and cheaper than a fully sized Type 346A or 346B set. While smaller and cheaper, it can still support the HHQ-9 firing, along with an MRSAM that can reach up to 100km, with the latter supported by the X-band radar serving as its tracking radar. The result would not be far off something like this at the top.
View attachment 55488
Sensors and systems are what makes the ship more expensive these days, not as much as the hull or even the engines.