An advanced residual error model for tropospheric delay estimation

An improved global zenith tropospheric delay model

Investigation of MODIS mission capability in tropospheric delay estimation for precise point positioning

Tropospheric delay is always considered as one of the factors limiting the accuracy of GPS. In this paper, the three-dimensional ray tracing technique is proposed to calculate the tropospheric delay. The ability of the MODIS mission to calculate the tropospheric delay is also examined. For this purpose, an area in central Europe was selected and a MODIS acquisition on 2008/08/01 was studied. In...

Estimating the Residual Tropospheric Delay for Airborne Differential GPS Positioning

In post-processing dual frequency GPS carrier phase data, the residual tropospheric delay can easily be the largest remaining error source. This error can contribute a bias in height of several centimetres even if simultaneously recorded meteorological data are used. This shortcoming is primarily due to the poor representation of the water vapour profile in the tropospheric delay models. In add...

Estimation of Tropospheric Zenith Delay and Gradients

We have analyzed data from an experiment over the Madrid (Spain) area obtained from 5 GPS receivers and 3 Water Vapor Radiometers (WVR), in order to compare their retrievals of Tropospheric Slant Delays. For this purpose we have tted a simple gradient model to both types of data, using a Kalman lter to account for the temporal variability of the zenith and gradient parameters. We show that the ...

The residual tropospheric propagation delay : How bad can it get ? *

The residual range delay error due to an incompletely modelled tropospheric propagation delay can usually be ignored by the average user of wide-area differential GPS. In general the atmosphere is “well behaved” and the use of standard range delay algorithms supplied with standard atmosphere parameter values will adequately model the “average” atmospheric conditions. It is possible however, for...