Monitoring based on IAC PNT tracking station data

55.9°N 37.8°E

Epoch

GPS constellation in view
DOP values by ≥ 5° elevation angle
GPS SVs current URE
Legend
12
SV is in working regime
12
"Unhealthy" flag in ephemeris
12
"Unhealthy" flag in almanac
12
"Unhealthy" flag in ephemeris and almanac
12
No ephemeris
12
URE > 50m

Monitoring is implemented in real time (update every 30 sec) based on IAC PNT tracking station located in Korolev, Moscow region (55.9° N 37.8° E)

The method used to identify failures in the GLONASS SVs operation is based on the URE (User Range Error) estimation –user positioning errors by space segment including environmental errors. Corrections for the ionosphere impact are calculated by the Klobuchar model, and for the troposphere impact – by the standard Saastamoinen model.

HDOP - Horizontal dilution of precision

PDOP - Position delusion of precision

GDOP - Geometrical delusion of precision