posted on Sep, 19 2007 @ 07:22 PM
Detecting 'Stealth' or stealthy planes, ask yourself:
What traces does the craft leave?
What energy is detectable?
It would normally give off an energy signature, that is, a combination of signs - heat, radar return, sound, air pressure waves.
The radar return is small, and they have technology on board to redirect so it looks like the craft is elsewhere.
Heat return is harder to mask, but harder to find unless you already have some idea of the time and flight path, I'd guess.
Sound is less a problem when the craft can go supersonic - detection is too late.
Traces or signs that it leaves are blocking the stars during night flight, creating a shadow on the ground during the day, making changes in the air
A lot of the strides in detection and stealth, especially tactics, come from submarine warfare.
Things once too small to detect are now becoming detectable. Put it all together, plus the various types of radar, increasing the radar sites, make it
There are countermeasures to the countermeasures, though.