4 ms·

Tomorrow Never Dies So, it can happen.

by new23d 6y ago

rootsudo 6y ago
Use an hackRF, yes you can.
throw0101a 6y ago
GPS signals are actually quite weak (though will be boosted with GPS III satellites), and so can be overwhelmed (and jammed): * https://arstechnica.com/information-technology/2013/07/professor-spoofs-80m-superyachts-gps-receiver-on-the-high-seas/ https://arstechnica.com/information-technology/2013/07/profe... The USN has brought back celestial navigation (sextants) as a backup mechanism in recent years: * https://www.npr.org/2016/02/22/467210492/u-s-navy-brings-back-navigation-by-the-stars-for-officers https://www.npr.org/2016/02/22/467210492/u-s-navy-brings-bac... US is examining backup systems for GPS/GNSS, including bringing back (e)LORAN: * https://www.defenseone.com/ideas/2020/12/we-need-backup-gps-actually-we-need-several-them/170391/ https://www.defenseone.com/ideas/2020/12/we-need-backup-gps-... * https://en.wikipedia.org/wiki/Loran-C https://en.wikipedia.org/wiki/Loran-C
- PoachedSausage 6y ago
  I believe it was a mistake to decommission eLORAN (both US and Europe), for the reasons you mention. Thankfully we still have terrestrial frequency and time standards (although there was talk of shutting down WWV). Now that the UK has been kicked out of Galileo, perhaps the government might think about reinstating eLORAN, it would be a good use for some the Longwave AM broadcast infrastructure that will be surplus in the next 10 years or so.
  - throw0101a 6y ago
    The UK had a go of it with eLORAN for a while, but no one else (France, Netherlands) seemed to have been interested, and so it was shelved AFAICT: * https://www.trinityhouse.co.uk/notice-to-mariners/27-15-enhanced-loran-discontinued https://www.trinityhouse.co.uk/notice-to-mariners/27-15-enha... * https://www.maritime-executive.com/article/europe-gives-up-on-eloran https://www.maritime-executive.com/article/europe-gives-up-o... South Korea is having a go at it: * http://www.digitaljournal.com/tech-and-science/technology/ships-ditch-gps-for-eloran-navigation-system-because-of-hacking/article/499423 http://www.digitaljournal.com/tech-and-science/technology/sh... A government or three (NATO?) have to decide on a system (eLORAN or other), publish standards, and buy a bunch of equipment (transmit and receivers) to kick start things.

Tomorrow Never Dies So, it can happen.

by new23d 6y ago

Tomorrow Never Dies So, it can happen.

rootsudo 6y ago

Use an hackRF, yes you can.

throw0101a 6y ago

GPS signals are actually quite weak (though will be boosted with GPS III satellites), and so can be overwhelmed (and jammed): * https://arstechnica.com/information-technology/2013/07/professor-spoofs-80m-superyachts-gps-receiver-on-the-high-seas/ https://arstechnica.com/information-technology/2013/07/profe... The USN has brought back celestial navigation (sextants) as a backup mechanism in recent years: * https://www.npr.org/2016/02/22/467210492/u-s-navy-brings-back-navigation-by-the-stars-for-officers https://www.npr.org/2016/02/22/467210492/u-s-navy-brings-bac... US is examining backup systems for GPS/GNSS, including bringing back (e)LORAN: * https://www.defenseone.com/ideas/2020/12/we-need-backup-gps-actually-we-need-several-them/170391/ https://www.defenseone.com/ideas/2020/12/we-need-backup-gps-... * https://en.wikipedia.org/wiki/Loran-C https://en.wikipedia.org/wiki/Loran-C

PoachedSausage 6y ago
I believe it was a mistake to decommission eLORAN (both US and Europe), for the reasons you mention. Thankfully we still have terrestrial frequency and time standards (although there was talk of shutting down WWV). Now that the UK has been kicked out of Galileo, perhaps the government might think about reinstating eLORAN, it would be a good use for some the Longwave AM broadcast infrastructure that will be surplus in the next 10 years or so.
- throw0101a 6y ago
  The UK had a go of it with eLORAN for a while, but no one else (France, Netherlands) seemed to have been interested, and so it was shelved AFAICT: * https://www.trinityhouse.co.uk/notice-to-mariners/27-15-enhanced-loran-discontinued https://www.trinityhouse.co.uk/notice-to-mariners/27-15-enha... * https://www.maritime-executive.com/article/europe-gives-up-on-eloran https://www.maritime-executive.com/article/europe-gives-up-o... South Korea is having a go at it: * http://www.digitaljournal.com/tech-and-science/technology/ships-ditch-gps-for-eloran-navigation-system-because-of-hacking/article/499423 http://www.digitaljournal.com/tech-and-science/technology/sh... A government or three (NATO?) have to decide on a system (eLORAN or other), publish standards, and buy a bunch of equipment (transmit and receivers) to kick start things.