Products & Tables

This page covers the [product] and [table] sections of pppx.ini and the files PPPx writes. For where to download the inputs, see Data Sources.

The [product] section selects a satellite-product source and the file paths.

[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)

• brdc — orbits and clocks come from the broadcast ephemeris (nav). The precise-only products are ignored.
• precise — orbits and clocks come from IGS products. sp3 is required; the others are optional. If clk is missing, clocks are taken from the SP3. Using precise requires the igsatx table.

• Only sp3 is mandatory for precise; broadcast ephemeris also works for PPP.
• ion is required when [model] iono uses a GIM (IONEX/brdc), and vmf is required when [model] trop = VMF1.
• Precise orbits/clocks can be used for SPP, but the DCB is not handled for single-frequency SPP — use [model] iono = IF in that case.
• For PPP: a bia product is needed when ppp_ar = yes; nominal attitude is used if obx is missing; 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:

The [table] section points at the static model files PPPx needs.

[table]
igsatx    = ../../table/igs14.atx
oceanload = ../../table/oceanload
channel   = ../../table/glonass_chn
gpt2w     = ../../table/gpt2_1wA.grd
orography = ../../table/orography_ell

It is good practice to set all table paths so a change of model never trips over a missing file. See Data Sources for how to obtain oceanload and igsatx.

A run produces up to three files, all sharing the observation file’s base name.

The primary output: one record per processed epoch with the station coordinates (ECEF, metres), their standard deviations, the receiver clock error (GPS), and the zenith total delay (ZTD). The coordinate frame follows the orbit products used.

Written whenever [output] level is not off. It records cycle-slip and outlier detection plus a priori and post-fit residuals. Each message is tagged with a severity level:

Always generated, in RTKLIB’s stat format, for visualization. PPPx writes the $POS, $CLK, and $SAT records. Unlike RTKLIB, $CLK values are in metres (not nanoseconds) and are absolute clock errors per GNSS system rather than inter-system biases.

See Visualization for plotting these files.