alt Hacker NewsMore likely image-based navigation, where you just upload the entire imagery of the route and then use it to correct your inertial references.
Encrypted positioning information from low-orbit satellites is another option.
More likely image-based navigation, where you just upload the entire imagery of the route and then use it to correct your inertial references.
Encrypted positioning information from low-orbit satellites is another option.
That doesn't work well in some conditions, it's not new either. Some cruise missiles that have TFR (Terrain-following radar) and actually do this already.
It also is not really applicable when you are on a balistic course at *very* high altitude, course correction has to happen early in these case given the reentry speed/constraints.