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Positioning Application: Why does the RTCM PRC value not equal the difference between the Measured range and true range?

Environment/Versions
  • Positioning Application
  • RTCM enabled
  • PseudoRange Correction (PRC) value
    • Value displayed in RTCM window and reported in RTCM message
Answer
  • This will occur when there are declared corrections/errors reported in the GPS Navigation message
    • For example an Af0 clock correction will effect the Pseudorange (measured range) but will NOT alter the PRC value
  • This is because the RTCM message does not need to make the receiver aware of the clock correction, as it is reported in the GPS navigation message
  • On the contrary, an undeclared clock error or track error will effect with PRC value

Product : SimGEN,PosApp,RTCM