Available on Sonra Desktop Software & Raw Data Extended Exports (100Hz)
Quality of Signal
Quality of Signal is calculated from satellite signal strength information whereby the 8 strongest satellites connected to the Apex device at any given time provide a Signal-to-Noise Ratio value ranging from 0 to 99, with 0 representing loss of signal and 99 representing perfect signal. Signal strengths between 20 and 30 are generally usable, while 30 to 50 is considered very good, and over 50 is excellent. These values from our 8 strongest satellites are totalled. Typically, our data will include Quality of Signal values between 250 & 400 depending on location.
HDOP & HACC should also be analysed when investigating signal quality as these account for satellite geometry.
The Quality of Signal number is not the only number used to determine the best satellites for accuracy and is why this is used in combination with the HDOP and HACC to ensure we have the best signal accuracy. The number of satellites available to the device in its location is a good indicator as if you have access to 20+ satellites you have a greater chance of having good quality compared to if you only had access to 10.
Number of Satellites (Displayed as 'No of Satellites')
This metric displays the total number of satellites that are connected to the Apex device from the Global Navigation Satellite Systems (GNSS) of GPS-Galileo-Glonass-BeiDou.
This access to additional satellite systems along with aides the device's capability to perform well in challenging environments.
- On the desktop, when appearing as a metric, this shows the average number of satellites connected to the GPS device during the selected drill/session.
- On the 'Raw Data Extended' 100Hz export from Sonra (displayed as 'No. of Satellites') the instantaneous number of satellites connected to the Apex device are displayed at each data point.
Available on Sonra Desktop Software Only
Samples (Count)
Total number of data points collected by the GPS chip during the drill/session (usually at 10Hz).