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A comment on Planned GPS outages in southern California. Parent comment

Re:Planned GPS outages in southern California by Artlav on Tuesday June 07, 2016 @02:38PM (#11856679)
The existing backup is the Russian GLONASS system, which many consumer chips support since the start of this decade or so, and there are two more constellations being deployed, by ESA and China.

I'm not sure how you can test such things not in the production environment. The early development was done with the transmitters on airplanes, but i would guess that the jammability can't really be tested that way.

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Re:Planned GPS outages in southern California by WorldMaker on Tuesday June 07, 2016 @02:57PM (#11856824)
Commercial vendor Iridium as part of their "Iridium NEXT" constellation currently being deployed will have a secure alternative to GPS as well, their STL service. [1]

[1] http://gpsworld.com/iridium-launches-alternative-gps-pnt-ser...

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Re:Planned GPS outages in southern California by selvakn on Tuesday June 07, 2016 @02:44PM (#11856716)
And India's own: http://www.thehindu.com/sci-tech/science/irnss-launch-indias...
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Re:Planned GPS outages in southern California by paulgerhardt on Tuesday June 07, 2016 @02:52PM (#11856784)
GPS uses a certain frequency. Use the high side band for prod, the low side band for staging. Simple :)
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Re:Planned GPS outages in southern California by hamiltonkibbe on Tuesday June 07, 2016 @03:08PM (#11856916)
The nice thing about PRN codes is that you can just use a different set of gold codes in the same band, as long as they have low enough cross-correlation
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Re:Planned GPS outages in southern California by brianwawok on Tuesday June 07, 2016 @02:40PM (#11856685)
Yup my GPS watch does GLONASS. Have never tried GLONASS only, but GPS + GLONASS is a fair bit faster to lock on to.
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Re:Planned GPS outages in southern California by mikeash on Tuesday June 07, 2016 @02:59PM (#11856845)
Most smartphones do both now as well. iPhones got it starting with the 4S, and various Android devices support it. I believe it's a requirement to be able to sell them in Russia, but it benefits us all.
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