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

Leith Bade leith at bade.nz
Tue Jun 12 09:58:28 UTC 2018

If you want to do RTK you can do it for less then $1000 now. The company I
work for makes one of these lower cost options https://www.swiftnav.com.
RTK enabled centimetre level positioning with a good $600 antenna.

If you want to use the SBAS trial you need a receiver that allows you to
select the SBAS satellite PRN ID of 122 and will allow a good receiver to
get about ~1.5m accuracy. For example the Ublox receivers will work, as
will most standalone GPS receivers

Galileo is still under development, will offer similar performance to GPS.
It will be another 2 years before this system is complete with all 24

 Android devices are hard-coded by the manufacturer as far as the GPS
settings so you would need to wait for an Android update that knows about
the Australian satellite and QZSS (which might take several years to be
common place).

My recommendation is to look at standalone GPS receiver like a Ublox M8
based device, that uses an external magnetic antenna you put on your car's

Leith Bade
leith at bade.nz

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-
>    navigation/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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> Talk-au at openstreetmap.org
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