[IGSMAIL-8421] IGS repro3 orbit and clock solutions for 2021-2022 [SEC=OFFICIAL]

[Salim Masoumi]

Dear Colleagues,

The set of Repro3 combined orbit and clock products from the 3rd IGS reprocessing campaign (Repro3) has now been extended to GPS week 2237 (November 6, 2022).

The extended Repro3 combined products generally follow the same combination methodology as those for the period 1994-2020 (see [IGSMAIL-8248]<https://lists.igs.org/pipermail/igsmail/2022/008244.html> and https://igs.org/acc/reprocessing/#repro3.). The only exception is that, since only two Analysis Centres provided phase biases for this extended period, a robust combination of phase biases and integer clock combinations was not possible. Therefore, the combined clocks for this extended period consist of multi-GNSS legacy clocks with no combined bias products.

Additionally, there have been a couple of name changes based on the latest IGS long product filename<https://files.igs.org/pub/resource/guidelines/Guidelines_For_Long_Product_Filenames_in_the_IGS_v2.0.pdf>: clock summary files are now named *CLS.SUM as opposed to previously *CLS.CLS, and *EOP.JSON files are now called *ERP.JSON. These filename changes have been applied to the full Repro3 period.

Similar to the full Repro3 period, the extended Repro3 combined products are consistent with the Repro3 terrestrial frame (SINEX) solutions and are based on the IGSR3/igsR3.atx frame as described in [IGSMAIL-8329]<https://lists.igs.org/pipermail/igsmail/2023/008325.html>.

The extended Repro3 orbit and clock combinations are available in the weekly sub-directories at https://cddis.nasa.gov/archive/gnss/products/repro3/ and will soon be available in other global data centres. The extended products are based on the contributions of 5 Analysis Centres:

* COD (Centre for Orbit Determination in Europe)
* GFZ (GeoForschungsZentrum)
* GRG (Groupe de Recherche en Géodésie Spatiale)
* MIT (Massachusetts Institute of Technology)
* NGS (National Geodetic Survey)

I would like to thank the Analysis Centres who provided their contributions to the extended Repro3 series. I would also like to thank the chair of the IGS PPP-AR working group Professor Jianghui Geng, Zhe Yan and their team at Wuhan University who performed the clock combinations.

Kind Regards,
Salim Masoumi
IGS Analysis Centre Coordinator



Salim Masoumi PhD  |  GNSS Team Leader
GNSS Analysis Section  |  Positioning Australia Branch
Space Division

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