[FOSS-GPS] Participants wanted for Nokia's PUSH competition

[Joseph Reeves]

Hi John,

>Some possible simplifications:
> O The base station could provide ntrip directly to the N900 rover which
>would do the processing.
> O The webservice could be implemented on the base station, eliminating the
>need for ntrip.
> O The repository could be dropped, allowing only "recent" measurements to
>be processed.

These were all the sorts of things I was thinking - using a base
station running on a P900 to a local network of connected devices.

> How do you plan to connect GPS receivers to the N900? The USB plug appears
> to be "device" instead of master.

I was thinking of using the phone's internal antenna. Would this be
suitable? For use on a detail pole, etc, we'd have to hack an external
antenna to it, or hope that there's a test location on a PCB that
could have an external antenna attached to.

> Bluetooth is nice for the rover, but it is
> a pain for the reference station.

Yes, this is something that will take some thought. Even in the Speak
and Spell example provided by Nokia they use bluetooth to communicate
with an arduino just inches away :-/

> Also, an N900 reference station needs to
> "auto power" so it can operate unattended.

It could function as a base station only when connected to by a rover?
Am sure there must be some software trickery that could be used for
that.

Cheers, Joseph



2009/9/22 John Morris <john at coyotebush.net>:
> I'd be interested ... I was just getting ready to do something similar.
>
> I've been thinking in terms of GIS data collection. The components would
> include:
>  O GIS collection software on the phone, (possibly a modified CyberTracker)
>  O A webservice for processing raw GPS data, giving "backpack" quality
> positions.
>  O A Repository of base station data, allowing postprocessing as well as
> current processing.
>  O An ntrip reference station (based on AC12 or LEA-4(5)T)
>
> As a simplification, I was going to do 20-30 second static positions based
> on pseudorange.  I originally choose a webservice to save both bandwidth and
> handset compute power. Phase based kinematic processing is the "holy grail",
> but it probably couldn't be implemented in a short time frame. Walk, then
> run.
>
> I was going to use a Linksys nslu2 "slug" for the ntrip reference station.
> I'd use a commercial "rent a web" server for the repository and webservice.
> It should be possible to move everything onto an N900 for a "Nokia-only"
> solution.
>
> Some possible simplifications:
>  O The base station could provide ntrip directly to the N900 rover which
> would do the processing.
>  O The webservice could be implemented on the base station, eliminating the
> need for ntrip.
>  O The repository could be dropped, allowing only "recent" measurements to
> be processed.
>
> How do you plan to connect GPS receivers to the N900? The USB plug appears
> to be "device" instead of master. Bluetooth is nice for the rover, but it is
> a pain for the reference station. Also, an N900 reference station needs to
> "auto power" so it can operate unattended.
>
>  - John Morris
>
> PS. I have assorted hardware, including an nslu2, a pair of AC12's, an
> LEA-4t, and a collection of compact dome antennas. The GPS receivers are
> wired for USB.
>
>
>
> -----Original Message-----
> From: foss-gps-bounces at lists.osgeo.org
> [mailto:foss-gps-bounces at lists.osgeo.org] On Behalf Of Joseph Reeves
> Sent: Monday, September 21, 2009 5:03 AM
> To: Open Source GPS-related discussion and support
> Subject: [FOSS-GPS] Participants wanted for Nokia's PUSH competition
>
> Dear all,
>
> Nokia is running a competition to hack / publicise their upcoming N900
> smartphone; they say:
>
> "We want you to come up with ideas to hack the N900. A panel of expert
> judges will pick the most impressive ideas. We'll support you to
> create them and then take the final creations on a world tour."
>
> There's more on the website here:
> http://blogs.nokia.com/pushn900/index.php/what-is-push/
>
> I'd like to hear from people who would be interested in contributing
> towards a D-GPS project based upon the Nokia phone; I'll stand as
> project lead and start work on the 1000 word description if there's
> enough interest. I propose the development of a D-GPS framework to
> enable high accuracy GPS position recording within a network of
> locally connected N900s and to provide two implementations of this
> technology; a hardware hack to provide the phone with a high
> sensitivity antenna and detail pole for survey grade recording and a
> second, standard hardware implementation, to enable precise location
> and messaging within an urban environment.
>
> The deadline for proposals is October 11th, so if anyone's interested
> we better start working soon.
>
> Cheers, Joseph
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