Tables

Several table files are needed when specific models are used for processing — mainly the antenna model, the tropospheric model, and the tide model. They are listed in the [table] section of pppx.ini, and all of them ship with the repository in its table/ folder.

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

Table	Purpose	Required when
`channel`	GLONASS frequency-channel numbers	GLONASS carrier phase is used (ppp/rtk/tdp)
`gpt2w`	GPT2w tropospheric coefficients	`[model] trop = GPT2w`
`igsatx`	IGS ANTEX satellite/receiver antenna models	`[product] src = precise` (PCO always; PCV for PPP/RTK)
`oceanload`	Ocean-tide loading coefficients per station	optional (skipped if missing for the station)
`orography`	Ellipsoidal heights for VMF1 grid points	`[model] trop = VMF1`

A few clarifications:

channel is only needed when GLONASS carrier-phase measurements are processed, i.e. in ppp / rtk / tdp.
igsatx is mandatory when [product] src = precise. When it is set, satellite and station PCO corrections are applied in every solution mode, while satellite and station PCV corrections are applied only for PPP and RTK.
oceanload is optional: ocean tide loading is simply not corrected if the coefficients for the processed station are missing from the file.

Although table files are not always required, it is recommended to set all table paths properly, so that a later change of model never trips over a missing file.

See Data Sources for how to obtain oceanload and igsatx.