Compass M1 Signals problematic

Researchers at Septentrio reported anomalies in the signal from the Compass M1 satellite. Analysis of high rate Doppler data from the E2 and E5b carriers revealed frequent spikes in the frequency of these carriers. These spikes were present in both the E2 and E5b bands (E6 had not been monitored in this analysis), and in both carrier and spreading code waveforms. They clearly indicate a problem onboard the satellite, possibly due to malfunction of the frequency reference of the signal generation unit. The glitches occur about 2 to 3 times per minute at seemingly random intervals. Depending on the design of the receiver tracking loops, they can lead to losses of lock or cycle slips. Septentrio doesn’t know when this problem started. Processing of previously collected data has shown that shortly after the launch the frequency was quite stable.

www.septentrio.com