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Because GLONASS does not have L5, which doesn't contribute significantly to the accuracy, the resources allocated for GLONASS are used for other satellite
constellations' L5 channels to enhance the accuracy.
Fix and floating are fixed and float solutions in RTK (Real-Time Kinematic) positioning, respectively, while single point refers to the single point solution, which is the basic positioning.
Currently, only the BeiDou-3 (BDS-3) system supports short message transmission; other satellite systems do not support it.
The accuracy of the GNSS module is actually a probabilistic matter, where 1σ represents 68.3% probability, 2σ represents 95%, and 3σ represents 99.7%.
The height accuracy is twice that of the horizontal accuracy. For instance, if the horizontal accuracy is 2cm, the height accuracy is within 4cm.
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