Monitoreo de la calidad de datos GPS continuo: la estacion UNSJ (San Juan, Argentina)

as a part of the argentine continuously operating reference station network, a gps (global positioning system) station named unsj (universidad nacional de san juan) was established in san juan city on 6th march 2007. the recorded data of unsj are widely applied to cadastral surveys and serve as the basis for defining national and regional geodetic reference frames. as a key component of the geodetic infrastructure, an efficient quality control of raw data and stability monitoring of a gps reference station is highly convenient. in this study, results of quality control of the unsj observations after two year of operation are reported. in order to check and characterize the receiver performance and the station environment, four indices were chosen. they are the number of observations, multipath on l1, multipath on l2 and cycle slips occurrence. also, the long term stability of unsj station was evaluated through the analysis of weekly coordinate time series provided by the sirgas (geocentric reference system for the americas) calculus centers. the analysis of the coordinates derived from different online processing services completes this study. the results indicate that during the analyzed period, the functioning of the station unsj was satisfactory, producing qualit indexes that are acceptable to international standards.