NavList:

Hello,

We know that GPS-GNSS systems have a number of vulnerabilities. Elsewhere, e-LORAN is promoted as a possible alternative or help to GPS. But there are other ones.

Referring to "a window of opportunity for celestial navigation experts" as said by Frank Reed, I would like to mention new European projects about hybrid navigation for merchant marines. Using optronic turrets and adequate image processing, automatic celestial data acquisition (altitude, time, bearing) can be added to GPS-GNSS data into the same program, running real-time. I should call this approach "native hybridation". It is well adapted in the open sea, when GPS is degraded regionally. I think there are similar projects probably in the USA. These and those projects can give good opportunities for celestial experts to contribute.

More extensively, we know that classical hybridation is able to mix GPS-GNSS with different sources (inertial systems, Radar...), and digital map-matching, using Kalman filter for instance. This is a good way to cope with GPS outages during coastal navigation.

Regards.
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