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Super-Accurate GPS Chips Coming to Smartphones in 2018

spectrum.ieee.org

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Re: Super-Accurate GPS Chips Coming to Smartphones in 2018

#4
>will give the next generation of smartphones 30-centimeter accuracy instead of today’s 5-meters

Didn't the US scramble the civilian signals specifically so it wouldn't be too accurate? And they're just okay with civilians having access to ultra accurate GPS receivers?

Re: Super-Accurate GPS Chips Coming to Smartphones in 2018

#6

As an avid hiker and runner I'm more excited to see what this will do for things like Garmin smart watches. I run through downtown Boston a few times a week and the accuracy is very bad at times making you look like you run much farther than you do.

You could probably trade accuracy of route position for accuracy of distance by averaging samples.

Re: Super-Accurate GPS Chips Coming to Smartphones in 2018

#7
post #4

>will give the next generation of smartphones 30-centimeter accuracy instead of today’s 5-meters Didn't the US scramble the civilian signals specifically so it wouldn't be too accurate? And they're just okay with civilians having access to ultra accurate GPS receivers?

Selective Availability was turned off in 2000, prior to that error was about 50m. Differential GPS could work around it anyway, so there wasn't a lot of point to keeping it on.

Re: Super-Accurate GPS Chips Coming to Smartphones in 2018

#8
post #4

>will give the next generation of smartphones 30-centimeter accuracy instead of today’s 5-meters Didn't the US scramble the civilian signals specifically so it wouldn't be too accurate? And they're just okay with civilians having access to ultra accurate GPS receivers?

There's usually restrictions that kick in at certain altitudes and/or hardware restrictions if you're going over a certain speed.

Depending on the source of signals used, the military can also just change the precision for civilian bands. But in times of peace / low threat levels, there's not a particular need to do so.

Re: Super-Accurate GPS Chips Coming to Smartphones in 2018

#10
post #4

>will give the next generation of smartphones 30-centimeter accuracy instead of today’s 5-meters Didn't the US scramble the civilian signals specifically so it wouldn't be too accurate? And they're just okay with civilians having access to ultra accurate GPS receivers?

Things have changed since the 90s.

> In May 2000, at the direction of President Bill Clinton, the U.S. government ended its use of Selective Availability in order to make GPS more responsive to civil and commercial users worldwide.

> The United States has no intent to ever use Selective Availability again.

The military has better precision, only because they buy better hardware. Similar hardware is used in commercial drones to improve GPS accuracy.

> Using two GPS frequencies improves accuracy by correcting signal distortions caused by Earth's atmosphere. Dual-frequency GPS equipment is commercially available for civilian use, but its cost and size has limited it to professional applications.

http://www.gps.gov/systems/gps/performance/accuracy/

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