Naval missile guidance thread - SAM systems

Max Demian

Junior Member
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High attenuation. The higher the frequency, the greater the energy loss as it goes through a medium.

I agree. However, to determine how serious a problem this is we need to know the environment where the radar finds itself and its typical beam paths. Why do I say this? Because there are several X-band volume search radars with operational ranges of several 1000s of kms which have no issue with atmospheric attenuation/scattering, for the simple reason that they are pointed into space looking out for ballistic missiles and their warheads.

Here is an illustration of radar attenuation at sea level due to two principal causes, oxygen and water vapor:
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If we add in fog and rain, the attenuation/scattering gets more pronounced. This is well illustrated on this page:
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So, a radar which needs to achieve long detection range with beams at low inclinations/altitude (eg, to mitigate for curvature of the Earth) and do so in all weather conditions would indeed benefit from operating at wavelengths below X-band.

There is another reason why S-band may be preferred, and that comes to target RCS. Conical shaped targets, like warheads and possibly ASCMs, have a greater RCS in S-band than in X-band. The downside is, that discriminating a target, ie warhead from decoy is more difficult in S-band than in X-band.

The other is the short wavelength. Imagine this. An X-band is like a 3" paint brush. S-band is like a 10" paint roller. Which is better for painting for painting a wall? Which is better for painting corners and tight spots? Volume air search is like painting the walls of a room. Fire control is like painting the tight spots. Do you want broad work? Do you want fine work? The range of radar bands from metric to K-band is like a set of painting tools that go from the very broad to the very fine.
I am not sure that this is a good analogy, or at least I find it more confusing than helpful. The geometric fan properties of a radar beam for volume search are a matter of lens shape. I can get a pretty wide beam with my flashlight operating in THz range.

Rather, I suspect the case for shorter wavelengths for fire control/guidance may lie somewhere else. But that's best left for a separate post.
 
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Tam

Brigadier
Registered Member
I agree. However, to determine how serious a problem this is we need to know the environment where the radar finds itself and its typical beam paths. Why do I say this? Because there are several X-band volume search radars with operational ranges of several 1000s of kms which have no issue with atmospheric attenuation/scattering, for the simple reason that they are pointed into space looking out for ballistic missiles and their warheads.

Not sure where you get 'several'.

Here are examples of ballistic missile early warning detection radar. These operate at VHF to UHF.

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Here is an illustration of radar attenuation at sea level due to two principal causes, oxygen and water vapor:
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If we add in fog and rain, the attenuation/scattering gets more pronounced. This is well illustrated on this page:
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So, a radar which needs to achieve long detection range with beams at low inclinations/altitude (eg, to mitigate for curvature of the Earth) and do so in all weather conditions would indeed benefit from operating at wavelengths below X-band.

Yes, but those are for space. Much of the range attributed is achieved going through the thinning atmosphere to outside of the atmosphere. In fact, X-band communication is common between satellites and surface stations. Not only that, but even shorter wavelengths than X are used, down to the K and Ku band satellite communication. Most naval warships tend to have X and Ku band SATCOM standard, and these are often seen in ships.

If its aircraft at long ranges, due to the Earth's curvature, the target aircraft is going to be low at the horizon close to the curvature of the Earth. And so indeed attenuation becomes much greater. Another attenuation factor is different humidity and temperature layers in the atmosphere, but which also create a bouncing effect that can be exploited for OTH use.

For an X-band radar to overcome this, you need very high power, and this leads to high cost. You can attain longer ranges with less power with longer wavelengths.


There is another reason why S-band may be preferred, and that comes to target RCS. Conical shaped targets, like warheads and possibly ASCMs, have a greater RCS in S-band than in X-band. The downside is, that discriminating a target, ie warhead from decoy is more difficult in S-band than in X-band.

That's also true. The lowest RCS of the radar does not go below its wavelength. For example, in a meter wide radar, its not going to be lower 1m2.

I am not sure that this is a good analogy, or at least I find it more confusing than helpful. The geometric fan properties of a radar beam for volume search are a matter of lens shape. I can get a pretty wide beam with my flashlight operating in THz range.

But on a shorter wavelength, a highly dissipated fan pattern will attenuate more and have a shorter range. You can get away with longer ranges with fan shaped scanning patterns with lower power. That's exactly what these radars do.

Type-120-Array-1S.jpg

The guides create a fan like pattern, and these arrays only steer on elevation with frequency changes. Horizontal determination is done by rotating the radar.

Fan like pattern is also part of height finding. Which beam the target passes is used to determine its altitude.

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fig972_01.jpg

Rather, I suspect the case for shorter wavelengths for fire control/guidance may lie somewhere else. But that's best left for a separate post.

I should add that if you want precise measurement of faster targets, you should prefer the shorter wavelengths for angular accuracy and doppler measurement, and that's an argument for using shorter frequencies. But if you add a long range requirement, you are going to have to brute force against the disadvantages of using a short wavelength, and this requires very high power, and leads to high cost.

I suspect you keep thinking about TPY-2. The case for such a radar is that detection isn't enough, you want a weapons quality track that can be used to queue other radars for a firing solution. The best way to describe TPY-2 is that its really closer to a fire control radar that is using sheer brute force to achieve long range surveillance.

You should consider that modern ballistic warheads often employ decoys and multiple warheads, and long wavelength radars don't work well with these as it becomes difficult to differentiate decoys and the warheads, and that's the other driving rationale for TPY-2 to use X-band. However, the cost of this radar is so prohibitive.

A good example of an ABM radar is AEGIS Ashore. This one is using S-band so its not an X-band example of a ballistic warhead search radar.

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Here is another example for ballistic missile detection. This one is using SMART-L, which is an L-band radar.

 
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Max Demian

Junior Member
Registered Member
Not sure where you get 'several'.
I had in mind the AN/TPY-2 and SBX radars.
US_Navy_060110-N-3019M-001_The_heavy_lift_vessel_MV_Blue_Marlin_sits_moored_in_Pearl_Harbor_Hawaii_with_the_Sea_Based_X-Band_Radar_SBX.jpg


Then there is the Cobra King, with its colossal dual S-band/X-band radars onboard USNS Howard O. Lorenzen. However, from what little is known, the X-band radar appears to serve as a tracking&discrimination radar, albeit one that can do so at several 1000s of km away. The radar system costs as much as one Arleigh Burke destroyer.
C-0JHaJn0GWzAiwD3cidy8VWI6SLbW8g_LBTdrOKPabfO7FCRX6Bsy1fvEwX9ushPyRPtr2JyqJLfEYWISx8xISPQpr-i9vJnEOpbg974cpY8L4
 
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Tam

Brigadier
Registered Member
But as you already said to yourself, the X-band is used as discrimination. Its not the optimal band for acquisition. Some other radar needs to acquire the target and then you use the X-band for target discrimination and tracking.

Here's more low frequency ballistic missile acquisition radars.

AN/FPS-85
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AN/FPS-132
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Chinese ones.

LPAR
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P-Band
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This one I don't have much information but should work similarly to PAVE PAWS.

20150810085448834.jpg 20150810085532769.jpg g2IZZKS.jpg
 

Brumby

Major
I am curious, what makes X-band less than ideal for volume air search?

The simple answer is cost The long answer is about trade offs relative to the nature of the threat, capabilities and cost of solution.

Specifically it is about pulse width, bandwidth and beamwidth and their relationship to frequency band. In order to understand their respective impact, we have to first turn to the radar equation that defines their relationship. In its simplest from the radar equation is :

upload_2020-2-18_10-51-59.png

Rmax = maximum radar range (m),

ρ = antenna aperture efficiency,

Pav = radar average power (W),

A = antenna area (m2),

G = antenna gain,

td = beam dwell time,

σ = radar cross section of target (m2),

k = Boltzmann’s constant (1.38×10-23 J/K),

T0 = 290 K, FN = receiver noise figure,

(S/N) = signal-to noise ratio required for detection,

LS = system losses.


Each of this variable component is in some way or form related to frequency band. Specific to our overall conversation and in particular radar discrimination it is about range resolution and angular resolution. Range resolution is inversely proportional to bandwidth. For a phased array radar, its bandwidth β is typically limited to roughly 10% of its operating frequency. The best possible range resolution ΔR is then about ΔR = c/2β, where c is the speed of light.

upload_2020-2-18_17-27-55.png

The SPY-1 radar used in its Aegis combat system which is an S-Band radar used for missile defense operates between 3.1 and 3.5 GHz. This frequency band approximates to a bandwidth of β ≤ 310 to 350 MHz. For such a β range, the ΔR ≥ 48 cm to 43 cm. In contrast say an X band operating at 10 Ghz will deliver a range resolution of 15 cm. A ballistic missile typically has a length of roughly 2 m Is S band sufficient for this purpose to provide the necessary discrimination? On paper yes. However the answer is more complex because we also need to deal with angular resolution which is a poorer cousin. Angular resolution is a function of beamwidth and a radar’s antenna beam is directly proportional to the ratio of the wavelength to the width of the antenna. Remember that wavelength is connected to frequency band. A radar scan is the time history of its signal strength caused by the shape of the radar antenna beam and its angular movement relative to its search volume. The radar typically has a narrow antenna beam which allows it to determine the azimuth and elevation of a target. The more accurately the radar must know the location of the target, the narrower the beam. The cross range dimension of a radar’s resolution cell is generally accepted to be the 3-dB antenna beamwidth. In simple terms, the larger the beamwidth the faster is the search but the constraining factor is the necessary resolution cell needed to discriminate its target at a given distance. We don;t know the details but the John Hopkins technical digest is of the opinion that the AMDR-S band has sufficient fidelity relative to the required task. An X band would be preferable but S band is more cost efficient.

That said, what is the point with all these technical details? Ultimately it is about the kill chain. In other words it is a sensor shooter conversation. As threats become more complex and the speed to target accelerates, the core idea behind any state of the art area defense systems like AB Flight 3 and AMDR is to create additional distance for detection in order to allow sufficient window to react to the threats. According to public data SPY-1(V)D has a detection range in excess of 310 kms against a missile of 0.03m2 RCS. The AMDR has been verified to achieve a 20dB in test and that translates to a 3.2 times distance to that of SPY-1(V)D and that is approximately 1000 kms. This gives an added depth of 690 kms to the defensive bubble for BMD.

In contrast, the S1850M installed on the Type 45 and Horizon destroyers are to my knowledge not BMD capable. Its stated detection range is only 400 kms but that is against a fighter size target which means anything between 1 to 3 m2 in RCS. It is D band which is L band equivalent of between 1 to 2 GHz This give rise to a range resolution of between 1.5 m to 75 cm and would be questionable fidelity for missile discrimination based on the discussions above. Based on these specs its detection range is only approximately 126 kms against a missile with RCS of 0.03 m2. While the Type 45 is a very capable area air defence platform, it is simply not in the category of the AMDR. Facts do matter. .

Finally on the issue of propagation loss it is not entirely relevant because in the overall conversation the radar equation incorporates this variable to derive the end state of range. As a point of note I have a graph below that charts the difference in spread loss between a S and X band frequency over a 500 kms range

upload_2020-2-18_17-32-48.png
 

Max Demian

Junior Member
Registered Member
SBX and AN/TPY-2 are two examples of X-band volume search radars with very long range. My argument was that when atmosphere attenuation/scattering is not an issue, there is nothing fundamentally bad about using X-band instead of say S-band.

This one I don't have much information but should work similarly to PAVE PAWS
I found it amusing how in the picture the line is drawn almost directly towards the PAVE PAWS radar in Hsinchu county, Taiwan.
 
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Blitzo

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I am in awe that a comparison between the SPY-6 and SPY-1 radars on Burkes would be compared with the S1850M/SMART-L in the BMD role for different ships with the argument that the latter two radars are incapable of performing the BMD mission when....

1: SPY-6 and SPY-1 operate in S band while the SMART-L family operates in L band, therefore making direct comparisons between the two a little bit flawed to say the last. It's the same reason why you wouldn't directly compare the performance of an S band radar with an X band radar.

2: All ships that operate with SMART-L operate with either an X band or an S band phased array radar as a complement. X band for ships like De Zeven class or Sachsen class (Thales APAR), S band for ships like Type 45 (SAMPSON). For existing and foreseeable Burkes, the SPY-6 and SPY-1 will be the only primary phased array radar equipped on their ship -- which again, makes direct comparisons a bit dicey.

3: Perhaps most egregiously, the idea that SMART-L family only have a range of 400km and are somehow incapable of performing the BMD mission, seems like a very strange claim to make when I think anyone even vaguely aware of the SMART-L family should be aware of the demonstrations of the SMART-L series of radars for the BMD mission and the latest SMART-L variants that offer enhanced range vs aerial targets (increased to 480km) but with additional BMD role as well (2000km range).
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....Now this isn't to say the latest SMART-L variants are "better" than SPY-6, seeing as they operate on different bands, but the notion that SMART-L is somehow incapable of performing the BMD role somehow inherent to the band that it operates in is utterly ridiculous and could've been determined by a rudimentary online search.
 

Brumby

Major
I don't know how it is possible to hold a conversation about this topic when you don't seem to have a working understanding of the various guidance and fire control concepts on other ships in the world.

It seems like you're doing some research around the topic as we're discussing it but only oriented towards the Burke class ships, the SPY-6 and SPY-1, and US missile systems used aboard those ships.

But if you're trying to have a discussion about what 052C's guidance and fire control concept is (and by extension, that of 052D, 055 etc), you need to have a working understanding of how the major other ship types operate as well. Type 45, Horizon, Grigorovich, FREMM, Kolkata, Sachsen/De Zeven class, all feature guidance concepts which require a working understanding. Those ships are all relevant reference points if we want to discuss what 052C's guidance and fire control concept is.

First up, I thought the initial conversation was about the Type 055 and not Type 052C? My only point of relevance from the onset was if you don't have facts around the earlier Chinese radar how do you extrapolate forward without a known base to work on.

I don't see how the different classes of ships you mentioned have any direct relevance to the subject of conversation. If there is you need to spell out the nexus. In any case, whatever radar that they have is bound by the radar equation that I mentioned in another post in reply to Max's question.

The main reason I mentioned SPY-6 and its relationship to SPY-1(V)D is because they represent state of the art technology Isn't that relevant as your objective was to discuss the type 055?
You're doing a great job quoting documents and articles that you've looked up, but it is completely irrelevant to the argument you're trying to make.
For example -- yes, it's basic knowledge that Block II ESSM and SM-6 do not need terminal illuminators (which, if I'm not sure I need to spell out for you -- operate in the X band) because they are ARH, and I've written statements to that extent in previous posts as well.
But there is a reason why the first batches of Flight III Burkes will retain their SPG-62 illuminators -- and that's because they'll still be using SARH guided missiles (like older SM-2 variants, and ESSM block I) which requires terminal illuminators that SPY-6 cannot provide.
ESSM Block I needs external guidance because they don't have internal sensors. They are short to medium range missiles against OTH sea skimmers and X band are more suited due to sea clutter. Such an architecture is a product of past technology. Their shortcomings are being addressed through Block 2 which dispense with their reliance on any external sensors. It is a function of history, past technology adoption, missile form factor and the nature of the threat and not necessarily an issue specific to SPY-6..

The fact that you write about SPY-6's ability to provide guidance for ARH missiles as if it is "news" without knowing that there are multiple other guidance/radar systems in S band in the world which already offer it (SAMPSON, EMPAR, MF STAR) is rather revealing.
It is not about "news" but facts. Those other categories you referenced to are no where in the same category of capability as SPY-6 Please refer to my other post to Max.

I am in awe that a comparison between the SPY-6 and SPY-1 radars on Burkes would be compared with the S1850M/SMART-L in the BMD role for different ships with the argument that the latter two radars are incapable of performing the BMD mission when....
AFAIK, the Ty[e 45 is not BMD capable. If you have the facts that state otherwise I am happy to be corrected. It is based on this article
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1: SPY-6 and SPY-1 operate in S band while the SMART-L family operates in L band, therefore making direct comparisons between the two a little bit flawed to say the last. It's the same reason why you wouldn't directly compare the performance of an S band radar with an X band radar.
I think you actually don't understand the nature of the technology and the radar equation. It is not about frequency bands but the capabilities and associated cost that can or cannot deliver the function require.

2: All ships that operate with SMART-L operate with either an X band or an S band phased array radar as a complement. X band for ships like De Zeven class or Sachsen class (Thales APAR), S band for ships like Type 45 (SAMPSON). For existing and foreseeable Burkes, the SPY-6 and SPY-1 will be the only primary phased array radar equipped on their ship -- which again, makes direct comparisons a bit dicey.
An L band at a lower frequency would be good for volume search but would need a higher frequency band to engage either with C or X. I have explained the reasoning in another post. Pairing it with S would not be my preference and superficially I would question such an approach. Are you sure about the S band? Can you please provide a source.

3: Perhaps most egregiously, the idea that SMART-L family only have a range of 400km and are somehow incapable of performing the BMD mission, seems like a very strange claim to make when I think anyone even vaguely aware of the SMART-L family should be aware of the demonstrations of the SMART-L series of radars for the BMD mission and the latest SMART-L variants that offer enhanced range vs aerial targets (increased to 480km) but with additional BMD role as well (2000km range).
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....Now this isn't to say the latest SMART-L variants are "better" than SPY-6, seeing as they operate on different bands, but the notion that SMART-L is somehow incapable of performing the BMD role somehow inherent to the band that it operates in is utterly ridiculous and could've been determined by a rudimentary online search.

I am not making claims but basing it on public sources as far as the Type 45 is non BMD capable. As to the Smart L-EWC, my impression is that it exist in a marketing literature and not as a real program of record. If it is a program of record please point out the source and what platform it is intended to be installed on.
 
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Blitzo

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First up, I thought the initial conversation was about the Type 055 and not Type 052C? My only point of relevance from the onset was if you don't have facts around the earlier Chinese radar how do you extrapolate forward without a known base to work on.

I don't see how the different classes of ships you mentioned have any direct relevance to the subject of conversation. If there is you need to spell out the nexus. In any case, whatever radar that they have is bound by the radar equation that I mentioned in another post in reply to Max's question.

The main reason I mentioned SPY-6 and its relationship to SPY-1(V)D is because they represent state of the art technology Isn't that relevant as your objective was to discuss the type 055?

Okay, so the original discussion I started off was about 052C's guidance concept and what that may mean for 055's guidance concept.

The inherent capability of SPY-6 or SPY-1 are not directly relevant because it is the way that the systems provide guidance to their respective missiles which matter.

For example, while it is obvious that the SPY-6 as an S band AESA with GaN is more capable than S band AESAs with GaA (like SAMPSON or MF STAR), the greater capability afforded to it by GaN on an equivalently sized array is not something which is relevant for the discussion about the guidance concept of 052C or 055.


In other words -- for the purposes of this discussion, radars like SPY-6 and SAMPSON and MF STAR can essentially be grouped together, because even though the SPY-6 is a more advanced radar primarily as a result of its GaN arrays, the fact that all three radars are S band MFR AESAs is much more consequential.
From there, it becomes a matter of teasing out how those three S band AESAs guide their missiles on the respective ships they are based on -- and when you integrate that information with how a variety of other ships guide their missiles (like SPY-1 equipped Burkes, or Sachsen/De Zeven, or Horizon, or Akizuki, or Grigorovich), can help provide the context needed to think about how 052C's guidance system may slot in and what that means for successive generations such as 052D and 055.



ESSM Block I needs external guidance because they don't have internal sensors. They are short to medium range missiles against OTH sea skimmers and X band are more suited due to sea clutter. Such an architecture is a product of past technology. Their shortcomings are being addressed through Block 2 which dispense with their reliance on any external sensors. It is a function of history, past technology adoption, missile form factor and the nature of the threat and not necessarily an issue specific to SPY-6..

Do you understand the difference between SARH and ARH guided missiles?
Do you understand which radars operating in which bands are necessary for the different engagement phases of a SARH vs ARH guided missile?

I ask these questions not to be a jerk, but because the choice of words you're using to describe the difference between ESSM Block I and Block II suggests you may not have a good grasp of it.

To expand on that:
Both ESSM Block I and Block II can receive targeting information and initial/midcourse guidance from S band radars, regardless of if it's a PESA (like SPY-1) or an AESA (like SPY-6).
However, ESSM Block I, being a SARH guided missile, needs offboard illumination in the terminal phase, and on ships with SPY-1, that illumination comes in the form of SPG-62 illuminators operating in the X band.
On ESSM Block II, being an ARH guided missile, it doesn't need offboard illumination in the terminal phase because it has its own onboard active radar seeker that can guide it in the terminal phase.


In other words, regardless of whether you are a SPY-6 or SPY-1 equipped Flight III or pre-Flight II Burke, your ship will still need SPG-62 illuminators to guide ESSM Block I missiles, however you won't need SPY-62 illuminators to guide ESSM Block II missiles.


It is not about "news" but facts. Those other categories you referenced to are no where in the same category of capability as SPY-6 Please refer to my other post to Max.

AFAIK, the Ty[e 45 is not BMD capable. If you have the facts that state otherwise I am happy to be corrected. It is based on this article which I quote :

I think you actually don't understand the nature of the technology and the radar equation. It is not about frequency bands but the capabilities and associated cost that can or cannot deliver the function require.

My point is that the specific capability of the SPY-6 has no bearing on the discussion because the primary advancement in capability offered by SPY-6 compared to existing S band AESAs is its addition of GaN technology.

As for Type 45; correct, it is not BMD capable -- for a variety of reasons which is worth a discussion of its own -- but it isn't because the SPY-6 is somehow a superlatively unique and capable radar.



An L band at a lower frequency would be good for volume search but would need a higher frequency band to engage either with C or X. I have explained the reasoning in another post. Pairing it with S would not be my preference and superficially I would question such an approach. Are you sure about the S band? Can you please provide a source.

The Type 45's SAMPSON operates in S band and it is paired with the SMART-L, yes.
I personally agree and I think such a configuration offers overlapping capabilities -- X band and L band would be more sensible imo, which is what ships like Sachsen and De Zeven, but here my point is that comparing the SPY-6 with the SMART-L/S1850M is not logical given how they operate on different bands.
It would be like comparing SPY-6 with Thales APAR.


I am not making claims but basing it on public sources as far as the Type 45 is non BMD capable. As to the Smart L-EWC, my impression is that it exist in a marketing literature and not as a real program of record. If it is a program of record please point out the source and what platform it is intended to be installed on.

Again, this is where a cursory background search might be useful.
Yes, the Type 45 isn't BMD capable, but please note I was talking about the capability of SMART-L for BMD applications, not saying that Type 45 is BMD capable at present.

Specifically, the newest SMART-L MM/N radar is BMD capable and has been installed aboard its first ship last year as well (notably being one of the first ships in the world to field a large GaN equipped AESA in service)
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Blitzo

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Well that's what we're discussing...

My belief is that the original Type 346 has the central S band array sandwiched by two C band arrays as described by the post about its development. The C band arrays are involved in guidance for the original variant HHQ-9s the 052C carried. The central S band and two C band arrays give it its distinct rectangular appearance.

For the Type 346A (and 346B after it), I suspect that its square geometry may reflect that the C band arrays have been deleted and that the entire thing is now an S band array, which of course would have consequences for the guidance of the SAMs that 052D uses.
The PLA and PLAN keep new missile variants quite close to their chest, and part of the reason is because it's difficult for us to spot any obvious external differences in new missile variants when they are stored in tubes or canisters most of the time, not to mention advances in guidance may not yield obvious external differences anyway. We have rumours of new missile variants for existing types in service of course, but not much in regards to what advancements or improvements they offer.

But given we know that they were offering FD-2000s (i.e.: export HQ-9s) in the early 2010s with ARH guidance, I suspect that 052Ds may have evolved variants of the original HHQ-9 with ARH guidance, which would jive with why their 346A looks like it may be an S band only array.



... however as I said at the beginning of this particular chain of discussion, this is only what I suspect and we haven't had any good quality rumours definitively saying either/or.

^ To clarify to anyone who may be wondering what this chain of discussion on my end is about -- this post basically is the one which precipitated it.

I.e.: it is a question about what kind of guidance concept/mechanism 052C's Type 346 uses, and what it may mean for 052D's guidance concept and 055 after it.
 
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