The Russian navigation system GLONASS seems to be in very good shape again. Since February 4, eighteen (18) satellites are continuously available for dual-frequency Precise Point Positioning (PPP). Now it is possible for example to monitor the behaviour of a very stable atomic clock connected to a GNSS receiver, using GLONASS measurements exclusively, without GPS.

We have processed in PPP data from the svtl station near Saint Petersburg in Russia. This station is connected to a hydrogen maser. Station measurements were taken during February 5. The GLONASS orbit and clock products needed for PPP have been generated internally and are available in magicGNSS. The following figure shows the resulting PPP pseudorange (code) and phase residuals, for the 18 GLONASS satellites.

Pseudorange (code) and phase residuals from PPP

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