Accuracy analysis

This section includes some 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 in static mode (non moving platform with static dynamics in the navigation filter).

Test setup
GNSS receiver Septentrio AsteRx
Antenna Septentrio PolaNT
Environment Rooftop, open sky, no multipath structures nearby
Data length 2.34 hours
Sampling rate 1 second
Local time 2019 Nov 18 12:45:20.000

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 IGN BCLN (16km baseline)

In order to assess the results, the same data file (converter to Rinex) has been processed using JPL APPS online Precise Post Processing (PPP) tool. The differences are shown in the table below:

component JPL APPS (ultra-rapid products) Jason PPK difference (vs JPL)
x 4787691.861 4787692.106 0.245
y 183434.826 183434.274 -0.552
z 4196130.151 4196129.589 -0.562

The East/North/Up difference between the two is -0.561 / -0.569 / -0.204 respectively.

Note: PPP results (JPL and NRCan) were performed with ultra-rapid orbits (in the case of JPL) and also the data take was very short (2h), which in the case of PPP can be a drawback in terms of convergence time.

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, no multipath)

Test setup
GNSS receiver Xiaomi Mi 8
Antenna internal
Environment Rooftop, open sky, no multipath structures nearby
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)