4 ms·

90cm resolution is more than enough to identify a ship. There arent manu military ships in this world. All appear in public regularly . 90cm is enough to get

90cm resolution is more than enough to identify a ship. There arent manu military ships in this world. All appear in public regularly . 90cm is enough to get overall hull dimensions and thereby separate a ship from its neighbours in port. They dont need to be read license plates. Ships are very big.

cma 2y ago
90cm would maybe be more susceptible to decoys (like the WWII inflatable tanks but with ships?)
- Sayrus 2y ago
  Decoys are harder to fake, for instance an inflatable tank doesn't emit much infrared compared to a real tank. This was not an issue for camera that only capture visible light such as what was available in WWII or the naked eye.
  - cm2187 2y ago
    Plus the ship can't appear suddenly in the middle of the ocean. And where do you hide the original ship?
    - m4rtink 2y ago
      Well... https://en.m.wikipedia.org/wiki/HNLMS_Abraham_Crijnssen_(1936)#/media/File%3AHRMS_Abraham_Crijnssen_disguised_as_a_tropical_island.jpg https://en.m.wikipedia.org/wiki/HNLMS_Abraham_Crijnssen_(193...
      - cm2187 2y ago
        But my point is that when you have a satellite tracking a slow moving ship every 3-4 hours, it's impossible to hide it.
        cma 2y ago
        It's easier in space because of no air resistance, but stuff like mylar balloon/sheath decoys I think beats out basically all missile defense. Aside from the infrared stuff, inflatable ships not in port wouldn't leave an actual wake of the right size etc. and might not be viable.
  - spyder 2y ago
    from: https://www.inflatechdecoy.com/features/ https://www.inflatechdecoy.com/features/ " 01_OPTICAL SIGNATURE - LIFE SIZE, PERFECT SHAPE AND LIGHTWEIGHT 02_RADAR SIGNATURE - ALL YOU NEED TO DO IS UNPACK THE DECOY AND TURN ON THE ENGINE. 90 SECONDS LATER THE DECOY GENERATES YOUR DESIRED RCS. 03_INFRARED SIGNATURE - INFLATECH DECOYS CONTAIN INTEGRATED THERMAL SIGNATURE MANAGEMENT SYSTEM. WE GUARANTEE 100% MULTISPECTRAL COPY OF THE DESIRED SIGNATURE."
  - lm28469 2y ago
    > This was not an issue for camera that only capture visible light such as what was available in WWII It wasn't as common as today but we already had IR aerial photography in the 40s
dhx 2y ago
Yes to 90cm being used for identifying the class of a ship. But probably no for 90cm being used for identifying a particular hull, which may only be determinable with higher resolution imagery to confirm a hull-specific feature such as an upgraded radar or gun.

cma 2y ago

90cm would maybe be more susceptible to decoys (like the WWII inflatable tanks but with ships?)

Sayrus 2y ago
Decoys are harder to fake, for instance an inflatable tank doesn't emit much infrared compared to a real tank. This was not an issue for camera that only capture visible light such as what was available in WWII or the naked eye.
- cm2187 2y ago
  Plus the ship can't appear suddenly in the middle of the ocean. And where do you hide the original ship?
  - m4rtink 2y ago
    Well... https://en.m.wikipedia.org/wiki/HNLMS_Abraham_Crijnssen_(1936)#/media/File%3AHRMS_Abraham_Crijnssen_disguised_as_a_tropical_island.jpg https://en.m.wikipedia.org/wiki/HNLMS_Abraham_Crijnssen_(193...
    - cm2187 2y ago
      But my point is that when you have a satellite tracking a slow moving ship every 3-4 hours, it's impossible to hide it.
      - cma 2y ago
        It's easier in space because of no air resistance, but stuff like mylar balloon/sheath decoys I think beats out basically all missile defense. Aside from the infrared stuff, inflatable ships not in port wouldn't leave an actual wake of the right size etc. and might not be viable.
- spyder 2y ago
  from: https://www.inflatechdecoy.com/features/ https://www.inflatechdecoy.com/features/ " 01_OPTICAL SIGNATURE - LIFE SIZE, PERFECT SHAPE AND LIGHTWEIGHT 02_RADAR SIGNATURE - ALL YOU NEED TO DO IS UNPACK THE DECOY AND TURN ON THE ENGINE. 90 SECONDS LATER THE DECOY GENERATES YOUR DESIRED RCS. 03_INFRARED SIGNATURE - INFLATECH DECOYS CONTAIN INTEGRATED THERMAL SIGNATURE MANAGEMENT SYSTEM. WE GUARANTEE 100% MULTISPECTRAL COPY OF THE DESIRED SIGNATURE."
- lm28469 2y ago
  > This was not an issue for camera that only capture visible light such as what was available in WWII It wasn't as common as today but we already had IR aerial photography in the 40s

dhx 2y ago

Yes to 90cm being used for identifying the class of a ship. But probably no for 90cm being used for identifying a particular hull, which may only be determinable with higher resolution imagery to confirm a hull-specific feature such as an upgraded radar or gun.