D37 Slant delay validation and observation error
This is part of work-package 6300, the purpose of which is observation
operator development for slant delays.
Objectives: To develop a slant delay observation operator
Methodology/Work Description: In order to obtain realistic
the errors and correlation of the GPS slant delays must be modelled
Observations for at network of ground based receivers will be simulated
a 3D water vapour field and used for assimilation trials. The goal of
simulations is to test our software and to estimate the capability of a
of GPS receivers to reconstruct refractivity field inhomogeneities at
scales. In addition we need to determine an optimal discretisation and
scheme of the refractivity field to be used for the processing of
data. The retrieved fields will be validated against water vapour
measurements during the CLIWANET campaign.
These modelled assumptions and the errors and correlation introduced
be studied with the aim at deriving a valid mapping model with
accuracy for the considered applications. The subsequent derivations of
delays follows this new strategy and will be test on a 3-month dataset
Deliverable. KNMI has carried out a validation study on
troposhperic slant delays and modelled the error characteristics.
The report is available here, Validation and
Error Modelling of GPS Tropospheric Slant Delays.
information contact John de Vries at firstname.lastname@example.org.