How to use CODE's IAR analysis products for PPP-AR, or integer-PPP (IPPP)
 -------------------------------------------------------------------------

 Please use the CODE IGS products of a particular analysis line
 - eph     ... SP3c/SP3d orbit file,
 - erp     ... IERS ERP file,
 - clk     ... 30-sec Clock(-RINEX) corrections
 - clk_05s ...  5-sec Clock(-RINEX) corrections (available for the final product)
 in conjunction with
 - bia     ... the accompanying Bias-SINEX file from CODE.

 These daily bias files contain pseudo-absolute (OSB)
 - pseudorange and
 - phase bias values for the GPS/Galileo constellation
 that are *consistent* with the associated ambiguity-fixed clock product and
 and thus has to be applied for *each* involved observation, specifically in
 the sense:

   O_measured = O_computed + B_satellite

 where O stands for Observation and B for Bias. Note that just satellite OSB
 (Observable-specific Signal Bias) corrections are relevant for PPP ambiguity
 resolution (PPP-AR) and integer-PPP (IPPP), respectively.

 Following this convention, you should get the integer nature of single-receiver
 (between-satellite) phase ambiguities automatically recovered for both
 - wide-lane (WL) ambiguities using the Melbourne-Wuebbena LC and
 - narrow-lane (NL) ambiguities using the ionosphere-free LC (when introducing
   the previously resolved WL integers).
 Note: NL ambiguity resolution may be performed in phase-only or in
       pseudorange-supported mode.
 CAUTION: It is critical that no satellite PCO corrections are applied for
          the Melbourne-Wuebbena LC. The current phase bias values of CODE
          are conditioned accordingly. This is crucial especially for GPS
          Block IIIA satellites as well as the complete Galileo
          constellation.
 IMPORTANT NOTE: Please follow the "no phase bias no AR" rule.


 References
 ----------

 CODE rapid product series for the IGS.
 Published by Astronomical Institute, University of Bern.
 URL: http://www.aiub.unibe.ch/download/CODE
 DOI: 10.7892/boris.75854.4

 CODE final product series for the IGS.
 Published by Astronomical Institute, University of Bern.
 URL: http://www.aiub.unibe.ch/download/CODE
 DOI: 10.7892/boris.75876.4

 CODE product series for the IGS MGEX project.
 Published by Astronomical Institute, University of Bern.
 URL: http://www.aiub.unibe.ch/download/CODE_MGEX
 DOI: 10.7892/boris.75882.3

 Villiger, A., S. Schaer, R. Dach, L. Prange, A. Susnik, A. Jäggi, 2019:
 Determination of GNSS pseudo-absolute code biases and their long-term
 combination. Journal of Geodesy (2019), Springer Berlin Heidelberg, first
 online 10 May 2019.
 DOI: 10.1007/s00190-019-01262-w

 Schaer, S., A. Villiger, D. Arnold, R. Dach, L. Prange, A. Jäggi, 2021:
 The CODE ambiguity-fixed clock and phase bias analysis products: generation,
 properties, and performance. Journal of Geodesy (2021), Springer Berlin
 Heidelberg, first online 28 June 2021.
 DOI: 10.1007/s00190-021-01521-9


 See also:
   ftp://ftp.aiub.unibe.ch/AIUB_AFTP.TXT

 This file may be found at:
   ftp://ftp.aiub.unibe.ch/CODE/IAR_README.TXT