As well known standard deviation estimation of GPS baseline (and components) by dedicated software are usually lower respect to the “real” accuracy. In fact, assuming as total errors the sum of components stochastic and systematic, GPS software take into account mainly the stochastic component. As also well known, accuracy and precision are two different entities and sometime using GPS technique is possible to obtain a good result, in terms of RMS, but not accurate. Moreover, the baseline accuracy is dependent from many factor as: baseline length, constellation, windows time observation, ionospheric and tropospheric models, etc.. Starting from these considerations a preliminary study has been performed using Bernese v.4.2 software. Data from IGFN (Italian GPS Fiducial Network) has been processed and the dispersion computed in independent baselines component has been investigated. These baselines are processed in ITRF2000, in different periods of the year (winter, summer, spring and autumn), for different days (one week for each period), for different length baselines and finally for different windows time (6, 12 and 24 hours) for a period of one year. The baselines analysed in this study are different for length and orientation on the Italian territory. The results have been showed and discussed.
Study of the accuracy of GPS relative positions with IGFN data
PERFETTI, Nicola
2003
Abstract
As well known standard deviation estimation of GPS baseline (and components) by dedicated software are usually lower respect to the “real” accuracy. In fact, assuming as total errors the sum of components stochastic and systematic, GPS software take into account mainly the stochastic component. As also well known, accuracy and precision are two different entities and sometime using GPS technique is possible to obtain a good result, in terms of RMS, but not accurate. Moreover, the baseline accuracy is dependent from many factor as: baseline length, constellation, windows time observation, ionospheric and tropospheric models, etc.. Starting from these considerations a preliminary study has been performed using Bernese v.4.2 software. Data from IGFN (Italian GPS Fiducial Network) has been processed and the dispersion computed in independent baselines component has been investigated. These baselines are processed in ITRF2000, in different periods of the year (winter, summer, spring and autumn), for different days (one week for each period), for different length baselines and finally for different windows time (6, 12 and 24 hours) for a period of one year. The baselines analysed in this study are different for length and orientation on the Italian territory. The results have been showed and discussed.I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
