[talk-au] Increased precision options for Australia - QZSS, SBAS or Galileo

Leith Bade leith at bade.nz
Tue Jun 12 10:04:23 UTC 2018


Our receivers work fine in Australia as I live in Canberra and work for the
Swift Navigation engineering department. Using one of the free CORS
stations here I can get 2cm positions from my car. Mind you the setup cost
~$2000.

Australia has only moved 1.8m since 1994.
http://theconversation.com/australia-on-the-move-how-gps-keeps-up-with-a-continent-in-constant-motion-71883

Unfortunately OpenStreetMaps only uses "WGS84" as it's datum which is not
that well defined compared to a surveying datum like GDA94/2020 or ITRF,
and most existing data has only been measured to a few metres (at most). So
I wouldn't worry too much about the drift as there are other larger sources
of error in OpenStreetMaps.

The SBAS trial is available to anyone with a receiver that can be set to
use PRN 122 (e.g. Ublox devices).


Thanks,
Leith Bade
leith at bade.nz

On 12 June 2018 at 12:56, Andrew Harvey <andrew.harvey4 at gmail.com> wrote:

> If you use RTK https://en.wikipedia.org/wiki/Real-time_kinematic you
> should get centimeter accuracy, but expect to pay $10k+.
>
> https://www.swiftnav.com seems like a cheaper option but not sure if it
> works in Australia and it not a consumer device, seems they just sell the
> boards.
>
> ...once you obtain sub-meter accuracy, keep in mind the whole continent is
> moving so even if you had no error in your GPS, a node someone entered in
> OSM in 2007 from GPS would be almost a meter out from someone entering it
> into OSM today.
>
> The SBAS trial was only aviable to selected people as part of the trial,
> does anyone know if it'll will work on regular devices, or will we need to
> run additional software, for Android, iOS?
>
> On 12 June 2018 at 12:39, Alex Sims <alex at softgrow.com> wrote:
>
>> Hi,
>>
>>
>>
>> I’m really wanting to have better accuracy from GPS for use with
>> Openstreetmap. I can use survey marks and a laser rangefinder, but having a
>> portable GPS would make so much easier to fix errors where objects have
>> been armchair mapped or even GPS mapped with errors up to 3 meters.
>>
>>
>>
>> I have tried three approaches
>>
>>    - QZSS – I can see this on my Android mobile phone but it doesn’t
>>    seem to be used. It seems as though I need a Japanese market device and
>>    even then I’m not sure I’ll get an increase
>>    - Galileo – looks promising but when I’ve tested on supported devices
>>    (friends who have recent phones) the accuracy isn’t delivered. Further
>>    investigation shows that there aren’t enough satellites in service yet most
>>    of the day to give 4 visible. (Using GNSS View http://qzss.go.jp/en/
>>    English text)
>>    - Lastly the SBAS trial from Geoscience Australia -
>>    http://www.ga.gov.au/scientific-topics/positioning-navigatio
>>    n/positioning-for-the-future/satellite-based-augmentation-system
>>    <http://www.ga.gov.au/scientific-topics/positioning-navigation/positioning-for-the-future/satellite-based-augmentation-system>
>>    - nothing magical has happened with any of the consumer grade devices I
>>    have access to. Also not sure how to test on an Android device if it is
>>    being used.
>>
>>
>>
>> Has anyone obtained sub-meter accuracy from any of these approaches, it
>> must be possible?
>>
>>
>>
>> Please discuss.
>>
>>
>>
>> Alex
>>
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>>
>>
>
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