Accuracy analysis

This section includes an accuracy analysis we have performed with Jason for you to have an idea of which accuracy you can obtain with the service

GNSS geodetic-grade receiver (static)

The purpose of this test was to assess the accuracy that can be achieved using a geodetic grade GNSS receiver and antenna in static mode (non moving platform).

Test setup Rover receiver Base station
GNSS receiver Septentrio AsteRx Leica GR50
Antenna Septentrio PolaNT Leica AR25
Environment Rooftop, open sky open sky
Data length 2.34 hours 24 hours
Sampling rate 15 second 30 second
Number of epochs 560 2880
GPS start time 2019 Nov 18 12:45:30.000 2019 Nov 18 00:00:00.000
GPS end time 2019 Nov 18 15:05:15.000 2019 Nov 18 23:59:30.000

The test setup (performed at the rooftop of Rokubun's headquarter offices at the MediaTIC building) is shown in the following picture:

AsteRx test setup

The Septentrio AsteRx data has been processed with Jason with the following main characteristics:

Processing characteristics
Strategy Post-Processing Kinematic (PPK)
Dynamics static
Reference station ICGC PLAN (17.4km baseline)

In order to assess the results, the same data file (converter to RINEX) has been processed using Canadian Geodetic Survey of Natural Resources Canada Precise Point Positioning (PPP-AR) tool. The differences are shown in the table below:

component NRCAN PPP (final products) Jason PPK difference (vs NRCAN)
UTM_X (m) 432640.419 432640.414 -0.005
UTM_Y (m) 4583770.355 4583770.352 -0.003
ellipsoid (m) 92.638 92.561 -0.077*

*Please note that we are currently working on fix for JASON so that the antenna models are properly taken in to account, this is expected to substantially close the gap between the NRCAN PPP solution and the JASON PPK.

Smartphone (non-moving dynamic)

This test intends to provide an estimate accuracy of the best accuracy that can be achieved with a smartphone in the most benign environment possible (non moving, open sky)

Test setup
GNSS receiver Xiaomi Mi 8
Antenna internal
Environment Rooftop, open sky
Data length 7 minutes
Sampling rate 1 second
Local time 2019 Nov 19 12:17

The smartphone was colocated on the same point at which the antenna of the static test. The data was then processed with Jason with the following processing strategy:

Processing characteristics
Strategy Post-Processing Kinematic (PPK)
Dynamics Smartphone was not moving, but processed with kinematic stochastics
Reference station IGN BCLN (16km baseline)

Easting/Northing error (smartphone dynamic)