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

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.

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

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.
>
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From:	Marius Pfeffer
Subject:	Re: [Paparazzi-devel] New GPS for centimeter level precision GPS
Date:	Thu, 14 Nov 2013 07:48:13 +0100