n7axw wrote:SWM wrote:Alizon, that's a lot harder than you think.
Mesan stealth ships project all their waste heat in a narrow beam, deliberately aimed away from potential observers.
They also have a smart skin which projects a view of the opposite sky, as if you were seeing through the ship.
There are limits to the effectiveness of these protections. We've had some (long and boring for most people
) discussions about how such a smart skin could work (basically, it would have to be holographic). But it is safe to say that these protections could probably make it extremely to detect outside of the stealth ship's own missile range, unless you happened to pass through the narrow waste heat beam.
If it is holographic, would it be possible to create area interference to disrupt the holograph?
No, you can "disrupt" a holograph like that. The light from a holograph is essentially the same as if it were coming from the original source.
Also, how close do drones need to be to break through the stealth? We know that ghost rider drones are quite speedy and could be programed to cover large areas of space with unpredictable crisscrossing patterns that might do the job if proximity to a stealthed ship allows the drone to detect it.
Don
That's really hard to say. I'll try to summarize pages of material I posted in the previous discussions of holographic camoflage in space.
In space, the real problem is that the stealthed ship would appear to be pretty close to the blackness of space unless it happened to be directly between you and a star. If you are very far away from the ship, the probability that the ship will occult a star is incredibly low. If you are really close to the ship, the holography could work pretty well and show the star nearly as if there were no ship in the way. It is an intermediate zone that is the tricky part.
The holographic image of a star will work well in a very long cone based on the ship, while the occultation zone (the shadow) for that star is an infinite cylinder, based on the ship. If you are outside the cylinder you won't see anything wrong. (Technically it is not a cylinder, but at the interplanetary scale it is close enough.) If you are inside the cone, you probably won't see anything wrong. If you are in the cylinder but outside the cone, you will see the star disappear--an occultation. I calculated that the holographic image cone of a diffraction-limited holographic system (i.e. the surface of a ship) a half-kilometer in radius would be a couple light-seconds long.
So, your detection system would basically have to be observing stars for potential occultations. Depending on how fast the detector is moving relative to the target ship, the occultation could be milliseconds long, even microseconds. So you need ultrahigh-speed photometry, which means there is a limit to the faintness of the stars you are observing. That in turn limits the number of observable stars, and limits the number of potential observable occultations. Multiple observers will multiply the potential occultation observations.
The end result is that you need vast numbers of detectors scattered around to have any likelihood of detecting the ship this way. Another problem is that graser and stand-off ranges for laserheads are inside the zone that the holographic system works well. So even if you identify a ship at a distance, your weapons systems will be hampered by the time they get in range.