Products

The [product] section of pppx.ini selects a satellite-product source and the path to each file. For where to download them, see Data Sources.

[product]
src = precise                                               ; opt: brdc/precise
nav = ./products/BRDC00IGS_R_-YEAR--DOY-0000_01D_MN.rnx     ; broadcast ephemeris       (brdc)
sp3 = ./products/COD0MGXFIN_20221000000_01D_05M_ORB.SP3     ; precise orbit             (precise)
clk = ./products/COD0MGXFIN_20221000000_01D_30S_CLK.CLK     ; precise clock             (precise)
erp = ./products/COD0MGXFIN_20221000000_03D_12H_ERP.ERP     ; earth rotation parameters (precise)
obx = ./products/COD0MGXFIN_20221000000_01D_15M_ATT.OBX     ; satellite attitude        (precise)
bia = ./products/COD0MGXFIN_20221000000_01D_01D_OSB.BIA     ; satellite bias            (precise)
ion = ./products/codg-DOY-0.-YR-i                           ; global ionospheric map    (common)
vmf = ./products/VMFG_-YEAR--DOY-                           ; VMF1 grid                 (common)

Every solution mode offers the same two options, selected with [product] src:

• brdc — orbits and clocks are computed from the broadcast ephemeris (nav), which must be a valid path. Products labelled precise are then ignored entirely.
• precise — orbits and clocks come from IGS precise products. sp3 is required; every other precise product is optional. Using precise also requires the igsatx table file.

• Only sp3 is mandatory for precise. If clk is missing, the clock corrections carried by the SP3 file are used instead.
• ion and vmf are mandatory only when the corresponding model is selected — ion for a GIM-based [model] iono = IONEX, and vmf for [model] trop = VMF1.
• Precise orbits and clocks can be used for SPP, but the Differential Code Bias (DCB) is not handled for single-frequency SPP — set [model] iono = IF in that case.
• For PPP specifically:
  • broadcast ephemeris also works for PPP, in which case no precise product is used;
  • the nominal attitude is used if obx is missing;
  • bia is used when [estimation] ppp_ar = yes;
  • pole-tide corrections are skipped if erp is missing — fine for most applications.

Product paths may contain placeholders that PPPx fills from [session] date (or the first RINEX epoch), which makes multi-day processing easy: