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Glonass Constellation Issues

Saturday 19 April 2014

Glonass Constellation issues 2nd April 2014 approximately 8am Daylight Saving Time (DST).

Our support line certainly ran hot during the above outage. As it occurred at the start of our typical work day many customers contacted us with issues regarding the operation of their receivers for high precision RTK work. Luckily we were able to instruct our customers in ways to turn off the use of the Glonass satellites and continue to use just the GPS constellation. This workaround proved successful. It is now suggested that for optimal operation that Glonass can be utilised by our customers. We have heavily promoted the use of Dual and Multi-constellation receivers and this glitch in the operation of the Glonass system is an example of the requirement for receivers to be fully flexible in their operation. However it is showing that manufacturers of GNSS receivers have room to improve the algorithms in their receivers to allow for “unexpected events” to be automatically catered for.

Cause: Technical reason

Due to an unknown cause there was an issue with the ephemeris issued by the navigation messages of the Glonass space segment. Real-time monitoring by http://glonass-iac.ru/en/GLONASS/DayMonitoringNew.php – The Russian, Federal Space Agency, Information-Analytical Centre showed these issues (illegal ephemeris, High URE) with the ephemeris records of all Glonass satellites for a period of approximately 11 hours.

Solution: For precision operation turn off the use of Glonass satellites.