SeaQueen
Posts: 1451
Joined: 4/14/2007 From: Washington D.C. Status: offline
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You're not necessarily wrong, but when ever people say, "object X has the radar cross section of a European (or Asian!) swallow (or some other object)," they aren't actually telling you anything. If you're seeing an RCS quoted as anything other than dB, you're most likely looking at something which is intended to obscure the truth. It doesn't tell anyone anything useful. Radar cross sections are frequency dependent, they are also aspect dependent. That means that a given aircraft, ship or weapon might be completely invisible or easily visible depending on the band of the radar, and on the direction from which they are observed. Furthermore, in an era where multistatic sensors are a reality, you now have to worry about an object's multistatic radar cross section, which is usually some average related to the different angles from which the object is being sensed. I will be really surprised if anyone can find real radar cross section numbers on any modern aircraft. If they do, someone is most likely going to go to prison. You also have to ask what you mean by "difficulty to detect?" What you're really talking about is signal excess versus range. Changing the radar cross section changes the distance at which a given sensor-target combination produces signal excess and therefore influences the median detection range. All of this, btw, depends on a lot of statistical assumptions about the nature of noise. What does all this mean about "stealth" ships? A "stealth" ship being sensed by some radar, at some frequency, will have it's median detection range by that sensor reduced by some amount. How much is that? It all depends. What is it useful for? Once again, it all depends. Ships, weapons, aircraft, all tend to have very different sorts of radars. They're constrained by different restrictions on space, weight and power. When you put it in those terms what does "stealth" buy you on a ship? It's really hard to say. Apparently some countries think it's quite valuable because they invest money in it. Why? Without some pretty hard core computer modeling, it's hard to say exactly. quote:
ORIGINAL: Skjold I'm by no means no expert, but stealth ships have the RCS of like a small fishing boat, instead of a frigate size. A fishing boat is still quite easy to detect, just a bit harder. If i am wrong, please feel free to correct me.
< Message edited by SeaQueen -- 10/16/2015 9:12:17 PM >
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