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SAR Imagery Reveals Presence of Concealed Sub at North Korea’s Sinpo Naval Base

76 points by infodocket 7y ago

antpls 7y ago
Off topic : I cannot access the page, "One more step,Please complete the security check to access www.38north.org" (captcha from cloudflare it seems) Solving the captcha didn't work for me, more captcha are presented to me. I'm on LTE network with javascript disabled, and I'm not allowed to access the page. This is discrimination, CAPTCHA should be illegal EDIT : for people with same issue, this works : https://web.archive.org/web/20200104181552/https://www.38north.org/2020/01/sinpo010320/ https://web.archive.org/web/20200104181552/https://www.38nor...
- Thriptic 7y ago
  Are you VPNed or using TOR? I'm blocking JS and am not having this problem.
  - antpls 7y ago
    No ! I use data from mobile phone (so the local mobile network provider, france)
- deleted 7y ago
  [deleted]
- daj40 7y ago
  This sounds less like discrimination and more like a bug. Where are you coming from that you think that a CAPTCHA would be used to prevent you from seeing this?
yread 7y ago
Are algorithms used for processing these images subject to the recently announced embargo? Cool stuff. I somehow missed that North Korea has a ballistic missile submarine. Makes a war against them even more difficult.
- derstander 7y ago
  SAR processing algorithms are available in open world academic literature (papers and books). Though I don’t know the specifics of the system in the article to know whether that specific algorithm is subject to any sort of export restrictions. Most implementations I’ve come across are variations of the standard textbook approaches, with modifications made for computational efficiency or a little company-specific secret sauce (think proprietary techniques) thrown in. If you’re looking for some search terms, you might try: “polar format”, “range migration”, or “tomographic backprojection”. The first two are Fourier-transform based approaches that are relatively computationally efficient. The last, in its textbook form is O(n^3) — less efficient.
- SiempreViernes 7y ago
  They are working on putting ballistic missiles on a sub, currently they only have road mobile ICBMs that can reach much of the USA with nukes.
  - portaljester 7y ago
    You have a source for that? All the info I have seen on their missiles is them having a rough time launching them
    - mef 7y ago
      https://www.nytimes.com/2017/11/28/world/asia/north-korea-missile-test.html https://www.nytimes.com/2017/11/28/world/asia/north-korea-mi...
    - SiempreViernes 7y ago
      Exact status is of course hard to determine, especially with open sources, but see the Hwasong-14[1] and 15. Both missiles have flown on trajectories demonstrating enough performance to reach the USA, and at least the Hwasong-14 has been displayed on a Transporter-Erector-Launcher. (Also, I hope you remember that they've got nukes now, partly courtesy of US domestic politics counting above mitigating real world problems) No doubt the North Koreans still have a lot left before reaching the operational capability of the Russian road mobile ICBM forces, particularly with respect to accuracy and reliability. But nuclear weapons are not that picky with aiming, and numerical redundancy is certainly within the North Korean capability. [1] https://missilethreat.csis.org/missile/hwasong-14/ https://missilethreat.csis.org/missile/hwasong-14/
darkhorn 7y ago
Well, may be. I'm not sure if I should trust USA after their lies about Iraq in early 00s.

76 points by infodocket 7y ago

Off topic : I cannot access the page, "One more step,Please complete the security check to access www.38north.org" (captcha from cloudflare it seems) Solving the captcha didn't work for me, more captcha are presented to me. I'm on LTE network with javascript disabled, and I'm not allowed to access the page. This is discrimination, CAPTCHA should be illegal EDIT : for people with same issue, this works : https://web.archive.org/web/20200104181552/https://www.38north.org/2020/01/sinpo010320/ https://web.archive.org/web/20200104181552/https://www.38nor...

Thriptic 7y ago
Are you VPNed or using TOR? I'm blocking JS and am not having this problem.
- antpls 7y ago
  No ! I use data from mobile phone (so the local mobile network provider, france)
deleted 7y ago
[deleted]
daj40 7y ago
This sounds less like discrimination and more like a bug. Where are you coming from that you think that a CAPTCHA would be used to prevent you from seeing this?

yread 7y ago

Are algorithms used for processing these images subject to the recently announced embargo? Cool stuff. I somehow missed that North Korea has a ballistic missile submarine. Makes a war against them even more difficult.

derstander 7y ago
SAR processing algorithms are available in open world academic literature (papers and books). Though I don’t know the specifics of the system in the article to know whether that specific algorithm is subject to any sort of export restrictions. Most implementations I’ve come across are variations of the standard textbook approaches, with modifications made for computational efficiency or a little company-specific secret sauce (think proprietary techniques) thrown in. If you’re looking for some search terms, you might try: “polar format”, “range migration”, or “tomographic backprojection”. The first two are Fourier-transform based approaches that are relatively computationally efficient. The last, in its textbook form is O(n^3) — less efficient.
SiempreViernes 7y ago
They are working on putting ballistic missiles on a sub, currently they only have road mobile ICBMs that can reach much of the USA with nukes.
- portaljester 7y ago
  You have a source for that? All the info I have seen on their missiles is them having a rough time launching them
  - mef 7y ago
    https://www.nytimes.com/2017/11/28/world/asia/north-korea-missile-test.html https://www.nytimes.com/2017/11/28/world/asia/north-korea-mi...
  - SiempreViernes 7y ago
    Exact status is of course hard to determine, especially with open sources, but see the Hwasong-14[1] and 15. Both missiles have flown on trajectories demonstrating enough performance to reach the USA, and at least the Hwasong-14 has been displayed on a Transporter-Erector-Launcher. (Also, I hope you remember that they've got nukes now, partly courtesy of US domestic politics counting above mitigating real world problems) No doubt the North Koreans still have a lot left before reaching the operational capability of the Russian road mobile ICBM forces, particularly with respect to accuracy and reliability. But nuclear weapons are not that picky with aiming, and numerical redundancy is certainly within the North Korean capability. [1] https://missilethreat.csis.org/missile/hwasong-14/ https://missilethreat.csis.org/missile/hwasong-14/

darkhorn 7y ago

Well, may be. I'm not sure if I should trust USA after their lies about Iraq in early 00s.