[Talk-cz] presnejsi trackovani pro OSM

Zdeněk Zavadil zzavadil na gmail.com
Sobota Říjen 13 20:15:29 UTC 2012


Zdar,
co třeba tohle: http://gpspp.sakura.ne.jp/rtklib/rtklib_beagleboard.htm 
(viz první odkaz na pdf)

Zdeněk


Dne 13.10.2012 19:58, Petr Holub napsal(a):
> Ahoj vespolek,
>
> trochu jsem hledal, jeslti by se nejakymi rozumne dostupnymi prostredky
> nedala zlepsit presnost tracklogu, zejmena ziskanych na kole, ale klidne
> i pesky a autem. Zlobi mne to hlavne pri rychlejsi jizde na kole spojene
> s rycheljsimi zmenami smeru (kdy Garmin 60CSx "nestiha zatacet") a v lese, kde
> je presnost vubec na pytel (60CSx ani Holux M-1000C). Zacal jsem uvazovat
> o nejakem modulu, ktery by sbiral raw GPS data na dostatecne frekvenci, na
> nichz by se dal udelat postprocesing - ale ne v cenove kategorii 30.000CZK
> a vic (tedy profi GPS zarizeni). Narazil jsem dve firmicky, ktere neco
> takoveho delaji (a do jiste miry spolu i spolupracuji): Optimalsystem.de
> a OneTalent-GNSS. Navrhy desek dela Michele Bavaro pro obe firmy a primarne
> pracuje pro ten OneTalent-GNSS - nize najdete jak moje dotazy na neho, tak
> i jeho odpovedi. Prestoze vyjadruje skepsi kolem dosazeni presnosti 1m
> v lese (pricem 1m povazuji pro potreby OSM naprosto dostacujici), nicmene
> porad by to mohlo by podstatne zlepseni proti tomu, co mam ted. Uvazuji
> o jednom z nasledujicich modulu:
> http://www.onetalent-gnss.com/ideas/wireless/denga10logbt
> http://www.onetalent-gnss.com/ideas/wireless/rappen10logbt
> Jinak data pro postprocesing by napr. pro okoli Brna mely byt zdarma
> dostupne ze site stanic EUREF:
> http://www.epncb.oma.be/_networkdata/stationlist.php
> pro Brno napr. tady:
> http://www.epncb.oma.be/_networkdata/siteinfo4onestation.php?station=TUBO_11503M001
>
>
> Moje dotazy do fora:
> - Hrali jste si nekdo s necim podobnym?
> - Meli byste chut a cas se nekdo do toho taky pustit?
>
> Diky,
> Petr
>
>
>
> From: Michele Bavaro [mailto:mbavaro na onetalent-gnss.com]
> Sent: Sunday, October 07, 2012 10:19 PM
> To: Petr Holub
> Subject: Re: a module for accurate mapping for OSM
>
> Hello Petr,
>
> Thanks for getting in touch!
>
> It will be very difficult to guarantee 1m accuracy (standalone real-time or differential post-processed) under dense
> foliage.
> Trees are well known to disrupt carrier phase information which is essential to achieve such accuracies.
> There is something about it on the German forum Kowoma:
> http://www.kowoma.de/gpsforum/viewtopic.php?f=1&t=3248&p=14992#p14992
>
> Denga10 and Rappen10 are not suitable. But their _LogBt or _LogWi version instead might work: they have a battery which
> will last a longer than 6hr, logging, and Bluetooth - or pretty much any other wireless communication system. Of course
> both have raw measurements but their carrier phase will be impaired under foliage as I wrote above.
> I am finalising the firmware in these days (today I had logging with fatfs and USB MSC running simultaneously finally)
> but -as it is quite experimental- I cannot really claim that is a "set and forget" kind of solution.
> Firmware is open though and if you have programming skills you may modify it to your needs.
> I am also working on enclosures... I have the bare boxes but I need to hand-tool them.
> If you are happy to do it by yourself I can make a discount:
> http://www.onetalent-gnss.com/announcements/contributorsgetafreereceiver
>
> Unfortunately in any case I cannot make you a lower price than 250EUR+VAT+shipping as I hand assemble the boards and I
> don't sell many of them so I cannot reduce the price by producing volumes.
>
> I would love to help you but I understand that compared to a 100EUR logger it's a lot of money to invest.
> By the way, all new Mediatek receivers have 10Hz and very high sensitivity... the new MTK3333 also has Glonass.
> ST Microelectronics has the STA8088FG which performs very well and it's very low cost.
> Not to mention of course the usual CSR GSD4E and Skytraq Venus..
> Have you looked at Fastrax, Locosys, and GlobalTop?
>
> I am very happy to help an enthusiastic mapper, please let me know if I can do something else for you.
>
> Best regards,
> Michele
>
>
>
>
>
> On 7 October 2012 18:52, Petr Holub <hopet na ics.muni.cz> wrote:
> Hello,
>
> I'm looking for a GNSS module that could improve precision of my
> mapping efforts for Openstreetmap - mainly mountainbike trails and
> hiking paths in the Czech Republic (http://www.mtbmap.cz/). Up to
> now, I'm using Sirf3-based Garmin 60CSx mounted on the MTB handlebar,
> and MTK3329-based Holux M-1000C logger switched to 10Hz, mounted to
> my MTB helmet. While Garmin 60CSx produces reasonably precise
> results while hiking open-air, it has significantly worse behavior
> in hilly forests and 1Hz operation is not sufficient for accurately
> tracking shape of paths when riding fast on my bike. Holux provides
> improves tracking of fast motion, but it has usually significantly
> worse accuracy (i.e., wanders more) despite being mounted on top
> of my helmet and thus having good sky view.
>
> Thus I'm looking for a reasonably priced (<400 EUR, ideally 200-300EUR)
> solution for more accurate logging of MTB trails, ideally at 4Hz or better
> and approx. 1m accuracy - obviously I don't need 1cm accuracy, but I'd
> like to have 1m accuracy even under forest foliage. I don't need precise
> real-time output (Garmin will work fine for real-time navigation;
> having, e.g., additional Bluetooth NMEA output to verify operation,
> would be nice for the module, but it is not conditio sine qua non).
> I assume to put the device on my helmet again, replacing the Holux
> logger - so I shouldn't be excessively large or heavy. An alternative
> solution would be to have the device in my backpack and only put the
> antenna onto the helmet. The device should keep working on a battery
> for at least 6hrs. The ideal workflow for me is to keep the device
> logging into its internal memory, come back home, download the raw
> log and post-process it using RTKLIB to achieve 1m log accuracy, without
> need for paying recurring costs (such as CZEPOS professional DGPS correction).
> I'm doing this effort as a hobbyist, thus minimizing operational costs
> is important.
>
> Is there some solution for this in your portfolio? I was looking into
> Denga10LogBt, but I'm not sure if it meets my requirements - to sum it
> up:
> - battery operated for at least 6 hours
> - internal RAW logging for later processing
> - 1m accuracy under foliage (50cm accuracy would be absolutely perfect)
> - 4Hz or higher frequency (about 10Hz is ideal)
> - either whole device or at least the antenna should be helmet-mountable
> - helmet-mountable part of the device (or complete device) needs to
>    be weather-sealed and needs to have reasonable weight (I can try to
>    build my own housing, but not sure...)
> - post-processing should avoid need for paid data (such as CZEPOS)
> - ideally use open-source software to process the data
>
> Maybe my wishes still can't be fulfilled, but I've just stumbled over
> your website and the devices really look promising...
>
> Thanks,
> Petr
>
>
>
>





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