Skipper DL850 - Page 50

Edition: 2017-09-25
Page 50 of 92
Chapter: 4. Installation
Quality
Name Description Example
STA
Quality
$PSKPVDSTA,<wsl>,<wst>,<bsl>,<bst>,<wal>,<bal><check
sum><CR LF
A new proprietary NMEA message, indicating the quality of the information from the sensor has been imple-
mented. The format is the following:
<wsl> - WT (speed through water), signal quality in %, longitudinal axis.
<wst> - WT (speed through water), signal quality in %, transversal axis.
<bsl> - BT (speed over ground), signal quality in %, longitudinal axis.
<bst> - BT (speed over ground), signal quality in %, transversal axis.
<wal> - WT (speed through water), validation of acceleration in m/(sec)
2
.
<bal> - BT (speed over ground), validation of acceleration in m/(sec)
2
.
• The rst 4 elds are presenting 3 levels of data quality % which are based on the percentage of the
good measurements samples within the total population, which is dened by the parameter Number of
Averages. The values are individual for each operation mode (WT/BT) and for each axis.
Values are in %, where:
• more than 50 % is generally good.
• 25 % - 50 % is generally warning.
• less than 25 % is generally bad.
• The last 2 elds are presenting 3 levels of data quality, which is based on the maximal acceleration
within 3 latest successful samples.
These parameters can be used for a bridge system to predict potential problems and switch to a secondary
system.
SKIPPER Electronics AS
Operation and Installation DL850 270 kHz