Piksi: RTK-GPS Receiver with 4cm Accuracy

[CanadianAvenger]

This is an cool one, that some of you may be interested in. I don't know enough about GPS to know the challenges they face, but if they can pull it off, I can see a lot of applications for their "low cost" solution.

http://www.kickstarter.com/projects/swiftnav/piksi-the-rtk-gps-receiver

[madires]

A few weeks ago I've read an article about a goup from a university deceiving a yacht in the Mediterranean sea by faking GPS signals. Since the crew relied on the GPS only they didn't notice the wrong location of the yacht. 4cm is impressive as long as you got proper GPS signals 

[Rufus]

This is an cool one, that some of you may be interested in. I don't know enough about GPS to know the challenges they face, but if they can pull it off, I can see a lot of applications for their "low cost" solution.

That accuracy requires differential GPS and that requires two GPS receivers with a data link (XBee in their case). It can tell you where one receiver is with respect to the other with high accuracy but doesn't tell you where either is with better than normal GPS accuracy. The receivers obviously can't be more than the data link range apart. If one receiver is stationary it can survey its position over time for improved absolute accuracy.

I don't know how much the carrier phase monitoring they talk about improves the absolute accuracy of a single receiver.

Project looks ok but doesn't seem that low cost to me. The low $14k target seems strange, not enough to realistically fund development and not enough for any volume production to bring costs down.

[ddavidebor]

4cm is possible but it require raw data processing of gps signal.

open source software is available on this and i've used it and i've got a 10cm precision near my building with a crappy antenna and the local university receiver as second one.

it work, but it's one of those thing only a engineer can do really

[ahnuts72]

This is what civil engineers and surveyors use look up trimble or topcon rtk.
With a base station and a mobile receiver with a uhf 2way radio you can get alot of distance and around 1 cm accuracy if I remember.
But cost from about $4,000 to $50,000 depending on options and accuracy

There is also a system with a cell modem that uses only one gps receiver and gets a position fix with a gps receiver that is permanently mounted at a know location though you pay a fee to use.



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