Precis-BX305 Static RTK Results Released


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Hi all,

Following the video “RTK centimeter accuracy road test with IMU”, below you can find a static RTK positioning result figure to demonstrate the Precis-BX305 product performance. The figure shows the real-time positioning results with radio data link and here is short description.

Receiver: a pair of Precis-X305 boards
Location: Roof of building
Time span: 1 hour
Baseline length: about 5m
Solution type: real-time solution

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  • Hey there, thanks for all the comments.

    GNSS RTK positioning accuracy depends on the baseline length and the motion status. This figure shows millimeter accuracy because its test scenario was relatively ideal. We didn't intend to demonstrate its millimeter accuracy since the accuracy may degrade in more challenging environment or longer baseline scenario. We will release more test results in different scenarios to proof its performance.

    Stay tuned.

  • Basically these results are achievable with any RTK system.  I took a look at a 90 minute session between two Ublox M8T receivers - different model Tallysman antennas, 1 meter baseline, ideal receiving conditions, kinematic RTKLIB processing, but the antennas were static - and got a horizontal "accuracy" figure of 3.9 mm and a vertical of 8 mm.  Both 95% figures.

    Note that in a test like this the rover's average position is assumed to be its true position.  In reality there is likely a small bias (plus any error in the base station coordinates you use).  Run the test over 24 hours and the numbers may grow a little bit.

    This is standard stuff simple L1 only equipment can achieve.  Where multiple frequency equipment becomes clearly superior is on longer baselines and under less than ideal receiving conditions.

  • John, you know what your base coordinates are supposed to be, to the millimeter. So you compare your measured results against that known base coord. Survey monument exact locations are published, secondary control networks are derived from these monuments with great precision.

  • I might sound noobish, but how on earth do you determine N & E error. I mean, how do you know the coordinates of a fixed point(i.e. base-station) you're measuring error against, with such level of accuracy?

  • Developer

    the chart being in x10^-3 is a small detail that is easily missed. That's the huge feature.

  • MR60

    Thx Billy, much better indeed!

  • Sure, we can add more according to your request.  but it's not useless when you are not using network data. lot's of agriculture and survey project or UAV use standalone base station. That‘s also why people buy two Precis 305 board as kits, and why we sell two. one of the boards is acting as base station. that's also our test scenario setup.

  • Should be better to see corrected data's with in real time Ntrip/rtcm correction or in post. Otherwise if we do not use correction from network your devices are useless !

  • 10^-3

    So it's in the order of millimeters.

  • MR60

    So is it correct to interpret the graph as a 2D location precision of about +/- 4 meters ? (biggest distance spread being the diagonal of the square around your circle : 3 x 1,42). If so, isn't it a bit disappointing versus the few meters precision of a normal GPS ? (I get sometimes one meter with clear skies on good days with a regular M8N Ublox)

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