For nyligt præsenterede Nordkorea et nyt interkontinentalt ballistisk missil (ICBM) under en militærparade.

Der er allerede sagt og skrevet meget om det nye missil, men jeg vil alligevel dele mine egne observationer.
Det første, og mest åbenlyse, er hvor meget større det nye ICBM er i forhold til det hidtil største nordkoreanske ICBM, Hwasong-15, som illustreret her.
Med et større missil, kan man groft sagt sige, at der er to muligheder:
1) Missilet kan bære den samme vægt som Hwasong-15 ud på en længere distance, eller
2) Missilet kan bære en højere vægt ud på den samme distance (eller kortere) som Hwasong-15.
I forhold til at bære en højere vægt, kan det have to betydninger:
a) Større sprænghoved, eller
b) flere sprænghoveder.
Flere sprænghoveder, kunne være i form af en "Multiple independently targetable reentry vehicle" (MIRV) kapabilitet.
Et missil med MIRVs betyder med andre ord, at Nordkorea ville kunne angribe flere mål med samme missil. Der sidder fysisk flere sprænghoveder på samme missil, hvorfor de kan frigøres og angribe forskellige mål.
Dette billede viser et antal MIRV sprænghoveder genindtræde i jordens atmosfære under en test. I en skarp situation kan afstanden mellem målene være meget større.
Selvom Nordkorea skulle have haft success med at udvikle et missil med MIRV kapabilitet, betyder det ikke, at det er operativt endnu - eller tæt på at være operativt.
En del af at kunne benytte MIRVs er at kunne placere de enkelte sprænghoveder i en bane, hvor de rammer deres mål
Hertil bruger man et Post Boost Vehicle (PBV), eller "bus" i daglig tale. På billedet ser man et eksempel på en bus med et antal sprænghoveder monteret. Den bronzefarvede struktur med hvid top i midten er brændstofbeholder til bussen.
Når missilet er afskudt og flyver gennem rummet, udskilles bussen og flyver derefter selvstændigt rundt i rummet, hvor den manøvrer ind i de baner, som sprænghovederne skal udskilles på, hvorefter den udskiller dem. Denne process er ekstremt kompliceret og krævende.
Vi har endnu aldrig set Nordkorea teste, eller eksperimentere med at udvikle en bus, hvilket gør, at der formentlig er meget lang tid (formentlig flere år) før de har et missile med en rigtig MIRV kapabilitet.
Det betyder ikke, at vi ikke skal tage det nye missil meget alvorligt, for mens de færdiggører udviklingen af en bus, vil de stadig kunne benytte missilet med et enkelt sprænghovedet - og med den størrelse missil, vil de formentlig kunne ramme alle steder på jorden.
Rettelse: Den fremtrædende struktur i midten er ikke brændstof til bussen. Det er missilets tredje trin, der går igennem bussen.
H/t @ArmsControlWonk for at påpege det.

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More from @SimonHoejbjerg

26 Aug
‼️ New thread of BMD & IAMD threads ‼️

Over the time I have written a number of different threads on various BMD and IAMD topics, that newer followers might not have seen.

So, as a service, this thread pulls them all together.

I will try to keep this thread up to date.
This thread explains the need for detailed and accurate planning in BMD.

It also explains the benefit of having forward based sensors that can provide early detection and cueing in support of rearward systems.

This is a personal favorite of mine, that explains:
1) What is Launch and Engage on Remote,
2) Why is it needed, and
3) What are the operational benefits, when it comes to defended area.

Read 14 tweets
29 Apr
Chefen for hæren, Generalmajor Lollesgaard har skrevet et indlæg om hærens fremtid, efter dette forlig.

Jeg bider mærke i denne sætning: "ved aktivering af brigaden (op til 180 dage) er det tanken, at ammunition, reservedele mv. skal indkøbes."

krigsvidenskab.dk/emne/haerens-u…
Det forekommer mig at være cirka samme tilgang som sundhedsvæsnet har haft til værnemidler: Vi behøver ikke så mange på lagrene, vi køber bare, når vi skal bruge dem.

Men når vi så skal bruge dem, er vi garanteret ikke de eneste, så der opstår problemer med at få dækket behovet.
Der er mange ting vi skal lære af coronakrisen, men en af dem er helt sikkert, at vi er nødt til at have realistiske lagre af kritiske forsyningsgenstande i hele beredskabet, inklusiv forsvaret. Vi kan ikke være sikre på, at der kan produceres nok, hurtigt nok, når behovet opstår
Read 4 tweets
27 Apr
The latest addition of @SeapowerMag has a really interesting article on the Danish navy's plan for Integrated Air and Missile Defense (IAMD) using the SM-6 missile to counter advanced threats.
I contributed a bit to the article.
Since 2018 the Danish navy has worked to integrated SM-2 missiles into the IVER HUITFELDT class frigates. The frigates were commissioned in the early 2000s, but its not until now they get SM-2 missiles.
In parallel the navy will prepare for integration of SM-6 as well.
Capt. Claus Andersen, deputy chief of staff for capabilities at Navy Command Denmark describes some of the thoughts that are going into developing the technological roadmap for the frigates, which will allow them to pace the evolving threat.
Read 10 tweets
30 Dec 19
I often see and hear people talking about whether or not a certain interceptor can intercept a specific ballistic missile type, e.g. can an SM-3 intercept an ICBM.

And very often people make claims that the interceptor's burn out velocity is critical to that.

It's actually not.
There's no question that an interceptor's burn out velocity is important and determines many things, including primarily the interceptor's range and speed, i.e. how fast it can get to the maximum range.

But it's not critical to achieve a succesful kill against an RV.
To achieve a successful kill, the relative velocity between the RV and the KW must be over a minimum level - otherwise the required kinetic energy is not achieved.

In this thread, I describe that in detail - and touch upon the required system elements.

Read 12 tweets
20 Sep 19
This is a really good thread on how to defend against drones and missiles.

There are, however, a couple of comments I would like to make to emphasize some of the challenges but also highlight some more capabilities and systems we have.
First of all, there are significantly more systems, that can defend against cruise missiles, than @DuitsyWasHere includes in his thread. A couple of examples below, but that's probably not even a complete list since I am only including missile based interceptors.
@DuitsyWasHere Patriot has been discussed frequently and that system, obviously has capability to defend against cruise missiles. Now, @luke_j_obrien has written som excellent threads on the fact, that Patriot includes different interceptors, some of which are better than other.
Read 19 tweets
23 Aug 19
"Aegis Ashore (AA) is equipped with Mk41 VLS that can fire Tomahawk missiles and therefore in violation of the INF treaty".

While true that Mk41 can fire Tomahawk, it doesn't mean that AA in Europe can fire Tomahawk.

This thread will try to explain what the Mk41 is - and isn't.
Caveat: All information in this thread is based on open sources.
Someone might have questions that exceed what can be found in open sources, and since I don't want to go to jail, I will not be answering those questions.
What most people don't realize is that launching a missile is done in cooperation between the Mk41 and the weapon system. In AA, the weapon system is Aegis, but in other navies it could also be another weapon system

Without the weapon system, it is impossible to launch a missile
Read 23 tweets

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