Re: [Paparazzi-devel] New GPS for centimeter level precision GPS

[Piotr Esden-Tempski]

Hi,

I think it is a good idea to follow their updates on kickstarter.

http://www.kickstarter.com/projects/swiftnav/piksi-the-rtk-gps-receiver/posts/660262

The boards arrived at their office. I bet they are very busy getting them ready 
to ship as we speak.

Cheers,
Piotr

On 14 Nov 2013, at 09:55, Sergey Krukowski <address@hidden> wrote:

> I also think the Piksi is not ready yet.
> We ordered on of their sets, but on the question about approximate delivery 
> date didn't get any answer at all.
> A bit pity, but hopefully guys will get it ready.
> 
> Best Regards,
> Sergey
> 
>> I don't think swiftnav is ready/working yet.
>> 
>> You can generate your own source of RCTM v2 (no Internet required) at the 
>> GCS using a uBlox "T" module (e.g. NEO-6T) in a fixed position and pyUblox.
>> 
>> https://github.com/benizl/pyUblox
>> 
>> pyUblox is still only beta, but seems to work quite well already. swiftnav 
>> will eventually be better, but also future uBlox modules might support RCTM 
>> v3 as well...
>> 
>> It may be possible to use rtklib rather than pyUblox, but when we looked at 
>> it it was good for postprocessing type precision positioning but not 
>> realtime. I don't remember why exactly.
>> 
>> Chris Gough
>> 
>> On 14/11/2013, at 5:48 PM, Marius Pfeffer <address@hidden> wrote:
>> 
>>> Hello
>>> 
>>> Found this:
>>> http://lists.gnu.org/archive/html/paparazzi-devel/2013-10/msg00021.html
>>> 
>>> You need either a continous internet connection, a second telemetry link or 
>>> the standard telemetry link to transmit the correction signals to the Piksi 
>>> rover.
>>> (look at the mailing list link)
>>> 
>>> Instead of xbees you can also use a raspberry pi with a umts stick and 
>>> tunnel the serial port down to the gcs.
>>> Should be easy, but mention most umts sticks have no own ip adress.
>>> 
>>> I talked to those guys from swift nav some months ago, all is open source 
>>> except the fpga design file.
>>> They were thinking about a open fpga architecture, i have no clue what 
>>> happened with this idea.
>>> 
>>> Building some would be possible, but expensive !
>>> 
>>> 6 Layer board design, stm32f4, max 2769, spartan 6 lx fpga ... very good 
>>> hot air soldering oven required
>>> 
>>> If anyone is interested, i attached the BOM for the hardware revision v2.3.1
>>> https://db.tt/L8sFwvMA
>>> 
>>> Regards
>>> Marius
>>> 
>>> Am 14.11.2013 05:58 schrieb "Karoly Molnar" <address@hidden>:
>>> This looks really interesting. However as I see it requires continuous 
>>> internet data connection. Is there a option to use cell phone modems on 
>>> UAVs both for this and for general bidirectional communication with the 
>>> ground station? Or, to gateway the RTCM messages from the ground station to 
>>> the plane as part of the uplink data?
>>> 
>>> Regards
>>> Karoly
>>> 
>>> > Date: Wed, 13 Nov 2013 10:37:41 +0000
>>> > From: address@hidden
>>> > To: address@hidden
>>> > Subject: Re: [Paparazzi-devel] New GPS for centimeter level precision GPS
>>> >
>>> > On 13 November 2013 09:55, Karoly Molnar <address@hidden> wrote:
>>> > > Hi
>>> > >
>>> > > IMHO, USD 500 is rather steep price for a GPS.
>>> > >
>>> > > I have a second-hand information about a cheaper alternative. Once I 
>>> > > had a
>>> > > discussion with a vendor who is developing a data logger /live video 
>>> > > capture
>>> > > / gps capture solution for the automotive market. Due to the nature of 
>>> > > this
>>> > > business they are testing their solution with as much GPS recivers as 
>>> > > they
>>> > > find around the world. They have noted that the accuracy of the GPS
>>> > > solutions vary significantly on each market. The most accurate GPS 
>>> > > receivers
>>> > > they have worked with were available for the South Korean internal 
>>> > > market.
>>> > > As they said, those were in the 10cm accuracy range. I did not explore 
>>> > > this
>>> > > further but if someone is interested, it might worth to check what is
>>> > > available there and procure a few pieces for testing.
>>> >
>>> > My guess is they're using DGPS. There are a number of known base
>>> > stations in South Korea.
>>> >
>>> > I looked into this briefly, and it seems like you can use DGPS with
>>> > u-blox - all you have to do is send it RTCM messages. There's a list
>>> > of transmitters here:
>>> > http://www.ndblist.info/datamodes/worldDGPSdatabase.pdf (I'm guessing
>>> > these send RTCM, but it doesn't say so explicitly).
>>> >
>>> > It also looks like you can get them over the 'net:
>>> > http://software.rtcm-ntrip.org/. And possibly other places.
>>> >
>>> > This seems like something that wouldn't be too hard to add to the
>>> > u-blox support.
>>> >
>>> > _______________________________________________
>>> > Paparazzi-devel mailing list
>>> > address@hidden
>>> > https://lists.nongnu.org/mailman/listinfo/paparazzi-devel
>>> 
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