Japanese Hypersonic Missiles

Flyaway

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Wonder if this line in the budget could be referencing the development of a boost-glide weapon.

the development of a high-speed glide bomb for use in contingencies on such islands (10 billion yen); the development of a system to monitor space activity (4.4 billion yen).

 
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https://asia.nikkei.com/Politics/Japan-plans-to-deploy-hypersonic-missiles-and-upgraded-carrier
TOKYO -- The Japanese government is looking to deploy long-range and hypersonic missiles as part of guidelines due out this month, though some critics say such equipment goes beyond the Self-Defense Forces' purely defensive mandate.

The Defense Ministry has been working on new equipment, ostensibly to defend far-flung islands, including high-speed glide missiles capable of traveling more than 300 km and hypersonic guided missiles that fly more than five times the speed of sound to evade radar networks. It also aims to develop unmanned surveillance submarines under the new guidelines. All are expected to become deployable in the mid-2020s.

There is also a proposal to retrofit its Izumo helicopter carrier into what would in effect be a full-fledged aircraft carrier -- a type of ship the country has not had since World War II. The idea is to have it carry F-35B stealth fighters, which require only a short takeoff and can land vertically. Japan wants to buy more F-35s, including F-35As already deployed domestically.

The government on Wednesday will submit a draft of the National Defense Program Guidelines and Medium-Term Defense Program to an expert panel, as well as working teams under the ruling Liberal Democratic Party and junior partner Komeito. It will reflect their feedback in the final version, which it aims to have approved by the cabinet in mid-December.

But some critics see long-range missiles and aircraft carriers as more of an offensive capability, which run counter to the war-renouncing Article 9 of Japan's constitution. The government hopes to persuade them that the new equipment will be used solely for defensive purposes.

These do not seem to be related to either of the programs already announced.

I wonder if there has been some confusion somewhere along the line and the boost glide and hypersonic missiles are actually the same program?
 
https://news.yahoo.co.jp/byline/obiekt/20180831-00095252/
 

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Low RCS can be achieved. tho Infra red, not so much.

The challenge however is to make the lo-lo-lo trajectory possible. Thus allow horizon masking.
 
stealthflanker said:
Low RCS can be achieved. tho Infra red, not so much.

The challenge however is to make the lo-lo-lo trajectory possible. Thus allow horizon masking.

Hypersonic or high supersonic at the low altitude is almost impossible due to the material sustainability
 
 
An earlier story on the same project:
 
The Defense News article of post #7 and Naval News article of #10 gives some good overview of these programs but I'd like to ask some details.

The full name of the Japanese hypersonic missile programs are 島嶼防衛用高速滑空弾 and 極超音速誘導弾, which means "High-Velocity Glide Vehicle for Island Defense (HVGVID)" and "Hypersonic Missile" respectively. You would notice that a lot of the new Japanese missiles are similarly named with 島嶼防衛用 as a prefix, which means "for island defense". More to it on the Japanese Cruise Missiles thread.

Anyways, the HGVGID is, as the name suggests, a boost-glide hypersonic vehicle. The plan is to develop 2 blocks of it. Block 1 will have a cylindrical re-entry vehicle more akin to a conventional MaRV and a range of over 500km. It will be boosted by a single-stage solid rocket. Block 2 will be a major improvement over block 1 and will have a wave rider RV. The booster will also be extended into 2 stages and as a result will have a range of over 1000km. Mid-course guidance will be performed via Japanese QZSS Asia-Pacific navigation system and INS. Terminal guidance is as described by the Defense News article.

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The Hypersonic Missile (I'll call it the Japanese hypersonic cruise missile or JHCM in short to avoid confusion) is a ramjet-scramjet dual mode cruise missile. It is thoroughly described by the Naval News article.

Though to note is that the currently revealed model is an experimental prototype for technology demonstration purposes.

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The blue part is a measuring instrument, not a warhead. A weaponised model is as shown below:

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The reason to go dual-mode ram-scramjet is to reduce booster size via extending engine operation envelop.

Also, the most recent model seems to have changed to a more cylindrical airframe from the rectangular airframe which was similar to the X-51:

images.jpeg
 
Nice to see Japan stepping up to the plate and responding to Xi and Kim in the only language they understand.
US, Japan and South Korea should move ahead as fast as possible to contain the two fatties.
 
Nice to see Japan stepping up to the plate and responding to Xi and Kim in the only language they understand.
US, Japan and South Korea should move ahead as fast as possible to contain the two fatties.
Some say that the reason US was so willing in abolishing the Korea-US Missile Range Guideline was so that South Korea could devlop and field their own MRBMs and IRBMs which could target China. Obviously, their most preferrable option would been to field their own, new intermediate range assets like LRHW in Korea, but as we have seen with THAAD deployment to SoKor, things are not as easy; if China's so up in the arse about deploying defensive assets to SoKor, imagine what'll happen when it's an offensive asset.

Same thing with Japan, but here the problem's more about internal politics.
 

MoD has announced details for the acquisition costs of the newer long-range strike assets. For the hypersonic programs will amount to more than ¥1 trillion ($7.27 billion). This includes the development (¥200 billion) and production (¥400 billion) of Hypersonic Missile(JHCM) as well as development (¥300 billion) and production (¥100 billion) of HGVGID block 2.

Development and procurement cost of HGVGID block 1 was not disclosed in the article.

More on https://www.secretprojects.co.uk/th...ore-unmanned-and-stand-off.40660/#post-569477
 
New graphics regarding the Japanese hypersonic cruise missile and HGV. It's been newly revealed that the HVGVID block 2 will be split in 2 increments of Block 2A and 2B. 2B will have a longer range, as shown in the graphic below.
 

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View: https://twitter.com/japanesepatrio6/status/1607303986838900737?s=20&t=Z7DeUbdtNqQKicSD87tbZA


High-velocity glide ammunition for island defense
・Early equipment type → Start mass production from next fiscal year (connection to 2A)
・Capacity-enhancing block 2A → Deployment after FY2027 (connection to 2B )
・Ability-enhancing block 2B → Deployment after 2030 (favorite) Range (including imagination)
・Early equipment type About 500km/Block 2A About 1000-2000km?
・Block 2B 3000km~?

from Inaba Yoshihiro, Japanese correspondent of Naval News.
 
Those seem like incredibly ambitious timelines. Has Japan had any previous hypersonic programs or testing?
They had hypersonic programs since the late 80s (eg. JSPTP/HYPR) but those programs focused primarily on ramjet/scramjets. As recently as this year they've tested the intake system of their new scramjet design strapped on a sounding rocket, its apogee being 168km and max v M 5.8.


There's a comprehensive introduction to JAXA's hypersonic research as well :


Though these are not exactly R&D efforts related to the timelines you've mentioned, since those are for HGV, although that doesn't mean they've been sleeping on HGV developments. There were other programs like HYFLEX which were more related to high-hypersonic high altitude glide vehicles. You could also take a look at their other space plane/shuttle programs of the past.
 
Having operational systems this decade still seems quite optimistic, though I wish Japan well in its efforts. The US has started several crash programs years ago and likely still won't have more than a handful of operational weapons until the end of the decade assuming its tests go well enough to save test articles for an experimental operational capability.
 
Having operational systems this decade still seems quite optimistic, though I wish Japan well in its efforts. The US has started several crash programs years ago and likely still won't have more than a handful of operational weapons until the end of the decade assuming its tests go well enough to save test articles for an experimental operational capability.
Yup, I agree with you that their schedules look real tight, but we'll see how they proceed. My reply was simply an answer to the question "Has Japan had any previous hypersonic programs or testing?". Their biggest problem seems like lack of experience regarding high-maneuverability HGVs. Their space shuttle programs weren't exactly one of those.
 
The HVGP is a new weapon scheduled to be deployed by the Japan Ground Self-Defense Force (JGSDF) starting in the fiscal year 2026. The hypersonic weapon is being developed for “island defense” roles. After being launched by a booster from a truck-mounted launcher, the warhead separates and glides to attack its target. The estimated range is approximately 900 km.
To achieve early deployment, the HVGP is planned to be developed in incremental capability enhancements. The test conducted this time was for the most basic “Early Deployment Version (Block 1)” test projectile. Furthermore, the development of an “Enhanced Capability Version (Block 2A)” with a significantly extended range capable of attacking targets up to 2,000 km away, and an “Enhanced Capability Version (Block 2B)” with a range of 3,000 km, is scheduled to be completed in the fiscal years 2027 and 2030, respectively.
As previously reported by Naval News, Japan’s HVGP (速滑空弾) could eventually have an anti-ship capability and be used against aircraft carriers. This consideration is part of the research on future enhanced capability versions. In the future, it is possible that the warhead could be equipped with a seeker for use in anti-ship mission.
 
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The turn around between project start and delivery is pretty insane with a 2025 production and 2026 operational capacity. Also with this Japan has finally stepped into having SRBMs and is just shy of MRBM territory with Blk 2B entering IRBM territory. I wonder what the warhead size for the missiles will be as the missile is going to be. It's 4000kg total with the 2000kg rocket section being around 64% of the overall length, so 2 tons just for the payload. Without the need for a seeker assembly a lot of space should be freed up for purely explosives so I would expect it to be around a ~1200-1500kg warhead.
1720493700652.png
From what I can tell from available info: Blk 1 (truck mounted double launcher) and 2A (trailer mounted single launcher) are both for island deployments while Blk 2B (same as 2A) is supposed to be deployed on Honshu with a much bigger support structure and easy access to resupply. Originally Blk 2 was going to have a different warhead body, but I think it was changed to speed up the Blk 2 program. After that Japan's HCM will use the same booster section as the Blk 2 missiles, but with a powered scramjet section which is the model we saw a few years ago.
 
That is crazy fast.

What basically off-the-shelf system are they using?
The warhead vehicle section is likely just piggy backing on similar projects of the past. The rocket motor on the other hand is probably just from Japan basically being tied for 2nd place in terms of rocket tech and just have a long list of designs to pick from. HGVs specifically aren't a huge barrier to entry especially if you already have the rocket tech figured out, but still an impressive timeline.
 
The turn around between project start and delivery is pretty insane with a 2025 production and 2026 operational capacity. Also with this Japan has finally stepped into having SRBMs and is just shy of MRBM territory with Blk 2B entering IRBM territory. I wonder what the warhead size for the missiles will be as the missile is going to be. It's 4000kg total with the 2000kg rocket section being around 64% of the overall length, so 2 tons just for the payload. Without the need for a seeker assembly a lot of space should be freed up for purely explosives so I would expect it to be around a ~1200-1500kg warhead.
There is the body and systems to consider the weight of as well as just the warhead. A warhead that heavy would surprise me given the range figure. I suspect it's nearer 500kg.
 
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There is the body and systems to cosnider the weight of as well as just the warhead. A warhead that heavy would surprise me given the range figure. I suspect it's nearer 500kg.
1720516742981.png
No idea if this is the exact spec of the test fired projectile, but this research prototype with a dummy warhead is longer than the live missile while weighing 1 ton less. It's not missing fuel since it specifies this weight is with fuel. Most of the time with the missiles, the seeker head assembly is the big that that takes up weight and volume. This just needs a GPS/INS system, maybe a datalink, batteries and servo motors + the outer shell. I just don't see all that taking up more than 1 ton of mass.
 
It won't be too surprising that they can get a HGV design fast based on their vast research on hypersonic passenger transport from 80s to 90s, with tons of weird design
 
The warhead vehicle section is likely just piggy backing on similar projects of the past. The rocket motor on the other hand is probably just from Japan basically being tied for 2nd place in terms of rocket tech and just have a long list of designs to pick from. HGVs specifically aren't a huge barrier to entry especially if you already have the rocket tech figured out, but still an impressive timeline.

It still seems like an incredibly ambitious schedule given the relative lack of previous hypersonic experience. I will be most impressed if the deployment is anything near that fast.
 
It still seems like an incredibly ambitious schedule given the relative lack of previous hypersonic experience. I will be most impressed if the deployment is anything near that fast.
Agreed. This feels like a case of either "Project X was working well and just needed more funding to bring to service" or at worst "Well, Project X had a good warhead design that flew well in flight tests, and Project Y had a good booster. Project X's warhead is within the weight limits of Project Y's booster. Stick the two together, do a short set of flight tests, and IOC in two years."

No way in hell they're starting from scratch and getting IOC in 2 years!
 
On the other hand, desperation can be a great motivator. Whether or not it would enough in this case to overcome Puzzle Palace bureaucracy and congressional incompetence and/or corruption however....
The Japanese tend to be very realistic on their timelines for getting weapons into service. Assuming that there's no massive black swan surprises, though. Americans tend to pad out delivery schedules with a lot more "well, assuming that the local engines are acceptable, if not it'll take X time for other company to make them and Y time to deliver."

That's why there's got to be an established program from somewhere that is getting picked up to be funded to completion by the Japanese.
 
Agreed. This feels like a case of either "Project X was working well and just needed more funding to bring to service" or at worst "Well, Project X had a good warhead design that flew well in flight tests, and Project Y had a good booster. Project X's warhead is within the weight limits of Project Y's booster. Stick the two together, do a short set of flight tests, and IOC in two years."

No way in hell they're starting from scratch and getting IOC in 2 years!
If they already have a working glide vehicle, increasing booster size should be relatively simple.

Wright noted, “Japan is developing the HVGP for both anti-ship and land attack missions to intercept and eliminate invading forces against Japan at a distance and at an early stage.”
 
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The turn around between project start and delivery is pretty insane with a 2025 production and 2026 operational capacity. Also with this Japan has finally stepped into having SRBMs and is just shy of MRBM territory with Blk 2B entering IRBM territory. I wonder what the warhead size for the missiles will be as the missile is going to be. It's 4000kg total with the 2000kg rocket section being around 64% of the overall length, so 2 tons just for the payload. Without the need for a seeker assembly a lot of space should be freed up for purely explosives so I would expect it to be around a ~1200-1500kg warhead.
View attachment 734126
From what I can tell from available info: Blk 1 (truck mounted double launcher) and 2A (trailer mounted single launcher) are both for island deployments while Blk 2B (same as 2A) is supposed to be deployed on Honshu with a much bigger support structure and easy access to resupply. Originally Blk 2 was going to have a different warhead body, but I think it was changed to speed up the Blk 2 program. After that Japan's HCM will use the same booster section as the Blk 2 missiles, but with a powered scramjet section which is the model we saw a few years ago.
A missile that's only 7m long and 0.53m wide has a mass of 4,000kg? Seems very high. For comparison, the very similar-sized French Hades missile was only 1,850kg (7.5m long, 0.53m wide). :confused:

It may well be 2,000kg for the missile and 4,000kg for the missile and canister.

View attachment 734142
No idea if this is the exact spec of the test fired projectile, but this research prototype with a dummy warhead is longer than the live missile while weighing 1 ton less. It's not missing fuel since it specifies this weight is with fuel. Most of the time with the missiles, the seeker head assembly is the big that that takes up weight and volume. This just needs a GPS/INS system, maybe a datalink, batteries and servo motors + the outer shell. I just don't see all that taking up more than 1 ton of mass.
That missile is 1m diameter and 10m long in total, 3,000kg is likely just the weight of the end section (left on diagram). Based on the weights of the Dark Eagle (0.876m x ~10.7m) and Pershing II (1m x 10.7m), it likely weighs nearer 7,500kg total. Wouldn't be surprised if that research prototype was for the Block 3 version (3,000km range), the size is about right.
 
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