WHY USE JOHAN SPORTS – RELIABILITY

Our data is the foundation of everything we do, therefore the reliability of measured data is very important to us.
Together with the European Space Agency we have achieved to find the optimal balance between reliability of data and costs.
Our JOHAN trackers consist of state-of-the-art sensors, to incorporate the latest technology for motion sensing.

 

We use the following methods to ensure our data quality and reliability.

SBAS AUGMENTATION – EGNOS

We support all augmentation systems worldwide to correct satellite navigation measurements for ionospheric and atmospheric influences. Simply said, it corrects measurements for weather and sun conditions (to filter errors out). These corrections lead to an increased accuracy and reliability of measurements; with EGNOS (European augmentation system) we achieve an accuracy of about 1.5 m.

MULTI CONSTELLATION GNSS – GALILEO

We support multi constellation GNSS (Geostationary Navigation Satellite Systems) reception. GNSS is a collection name for all satellite navigation system. In addition to GPS (American system), we support the following constellations to increase reliability and quality:

 

  • Galileo: European
  • Beidu: Chinese
  • GLONASS: Russian
  • QZSS: Japanese

 

This development in the satellite navigation world is great, because the more satellites in space, the better our measurements will become.
This will result in a few advantages for our users.

Increased accuracy

Especially the realisation of Galileo, the European satellite navigation system, will result in a drastic increase of location accuracy. At the moment our accuracy is about 1.5 meter, but with this we can ensure measurements on a decimeter level accuracy. This increase in accuracy is caused by a few improvements:

 

  • the Galileo satellites are newer; better signal transmission to earth
  • Galileo is a civil system (not military), thus the full signal is available on earth to be used for location determination

 

Increased availability

A problem with GNSS measurements is that sometimes the measurements are troubled by lack of visibility to the satellites. For our use case, this occurs mainly in large stadiums with limited visibility to the sky. When there are more satellites in the air, the needed gap of visibility can be much smaller, because there are only 4 satellites needed to determine the position.

INERTIAL MEASUREMENT UNIT (IMU)

To measure the accelerations and orientations of the body we use a 9 DOF IMU, which consists of the following sensors:

 

  • Accelerometer: measures acceleration in three axes
  • Gyroscope: measures rotational speed around three axes
  • Magnetometer: measures the magnetic north (independent of orientation)

 

Our IMU gives a reliable and accurate motion measurement at a rate of 100 times per second (100 Hz).
This is very useful for our clients because with this sensor we capture very small and inertial movements of the body:

 

  • Short accelerations
  • Jumps
  • Impacts