[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

Australia has only moved 1.8m since 1994.

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).

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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