Analysis Standing Committee (ASC) Harmonization of QC Results Pilot Project
Range and time biases reports from the analysis centers are used by the stations as a Quality Control (QC) check. The format of these reports have been standardized (i.e. contain pass-by-pass range and time bias estimates) to some extent, but the range and time biases results are diverse. This is because the underlying analysis techniques and modeling are quite different (e.g. different satellites, different arc lengths, different station coordinates and force models). This range and time bias results may lead to confusion if one doesn't know how to interpret them.
Range and time biases between LAGEOS-1 and LAGEOS-2 should be the same (i.e. within a few millimeters and microseconds, respectively) for a given site and time period. An unsymmetrical difference between LAGEOS-1 and LAGEOS-2 indicates a station position error and/or modeling problem. The analysis centers are encouraged to ascertain that their station coordinates are accurate as possible.
