Estrategias de cálculo del retardo troposférico y su influencia en prcesamiento GPS de alta precisión

Abstract

Zenith Tropospheric Delay (ZTD) computation is a major task in GPS observation treatment. Usual/y, ZTDs are obtained trough existing models like Saastamoinen (1973) or Hopfield (1969). The meteorological data involved to compute these models can be obtained from empirical global models, like SA (Standard Atmosphere), "Minimum Operational Performance Standards" (MOPS) or GTP (Global Pressure and Temperature). These models are improved by mappingfunction like Niel! (1996) or Herring (1996). Nevertheless, the best option should be obtained with the local/y registered meteorological data. 1n this paper, different models and meteorological parameters are compared in order to establish maximum difference criteria between the values obtained by the Global models and the local measured ones. For such purposes, two lGS wel/-known station with meteorological sensor have been used: MATEra and Z1MMerwald. For the GPS data ana/ysis, Bernese 5.0 and AutoGNS (Zurutuza et al., 2007) have been used.