[vonmoltke]

> Also I assume radar-proof is just because it's a ground effect vehicle that will never fly high enough to show up on radar it certainly doesn't look all angular like a stealth bomber. In which case my bicycle is also radar-proof?

From the way the article is worded, it does seem the author is only considering air search radar with this claim. Without low observability features, this will show up on surface search and surveillance radars. There might be an initial period where some radars fail to register it because they reject it as a possible target due to its kinematics. If craft like this become common, though, the signal processing algorithms will be updated to handle them. Most can already deal with very low-flying helicopters anyway.

That said, just because it isn't angular doesn't mean it doesn't have low observability features. Radar absorbing material would still make it harder to detect. So would more subtle elements of the physical design. I don't think "radar-proof" in that section header is justified, though.

[dylan604]

Even on airborne radars like AWACS, they can detect ground movement. They typically have a filter to ignore things under certain speeds as they are not typically concerned about traffic near highway speeds. However, the proposed speeds for this thing would still show up with those filters enabled. It would be interesting to see what minimum speeds would be.

[vonmoltke]

Yes, AWACS has limited moving target indicator (MTI) capability. A full-featured maritime MTI radar would easily pick this up, provided the signal processing algorithms don't reject the track for moving too fast.