[SystemSafety] GPS jamming

[Brent Kimberley]

 Has anyone mentioned data voting/fusion/steering?
    On Thursday, July 11, 2019, 09:03:21 a.m. EDT, Olwen Morgan <olwen at phaedsys.com> wrote:  
 
  

 
 
To put this further in context, I've often wondered whether the orbiting GPS/GALILEO/GLONASS systems were ever really cost effective idea if they can be spoofed. All that putting things into orbit does is make it harder for criminals to take those assets out. A terrestrial system with equivalent accuracy could, AFAI am aware, be set up using a network of shore-stations and a fleet of Flettner ships carrying navigation beacons. The ships get and share accurate fixes from shore stations and cover the oceans. That would probably mean long-wave operation but so what? With enough ships (presumably much cheaper than satellites ???) the required redundancy ought, AFAI can see, to be achievable.
 

 
 
regards,
 
Olwen
 

 
 On 11/07/2019 13:49, Martyn Thomas wrote:
  
 GPS can be spoofed cheaply too ...

Martyn

On 11/07/2019 13:24, Phil Koopman wrote:
 
 Addressing an earlier point, GPS was likely more compelling for
aircraft than ships.  Ships simply don't move all that fast, so the
ability to get an instant navigational position update is more
important for aircraft and other flying objects.  While imperfect,
Omega and Transit worked pretty well for ships in their time (if you
were actually paying attention to navigation).
 
  
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