How accurate is the error estimation?
Our experiments with different sets of transmitters at fixed positions or moving slowly have shown proper matching with the error estimations. Yet, in a few cases users have reported significant discrepancies. The error estimation process is not totally independent of the transmitter frequency stability, or of the platform motion which also translates into a frequency shift. It assumes that the frequency is ” approximately ” stable during the satellite pass. As a consequence, oscillator instability or a fast moving platform may lead to underestimation of the error.
