Analysis of regionally enhanced GPS orbit and clock solutions and contribution to improvement of real-time precise point positioning

This work experimentally examines the performance benefits of a regional CORS network to the GPS orbit and clock solutions for supporting real-time Precise Point Positioning (PPP). The regionally enhanced GPS precise orbit solutions are derived from a global evenly distributed CORS network added with a densely distributed network in Australia and New Zealand. A series of computational schemes for different network configurations are adopted in the GAMIT-GLOBK and PANDA data processing. The precise GPS orbit results show that the regionally enhanced solutions achieve the overall orbit improvements with respect to the solutions derived from the global network only. Additionally, the orbital differences over GPS satellite arcs that are visible by any of the five Australia-wide CORS stations show a higher percentage of overall improvements compared to the satellite arcs that are not visible from these stations. The regional GPS clock and Uncalibrated Phase Delay (UPD) products are derived using the PANDA real time processing module from Australian CORS networks of 35 and 79 stations respectively. Analysis of PANDA kinematic PPP and kinematic PPP-AR solutions show certain overall improvements in the positioning performance from a denser network configuration after solution convergence. However, the clock and UPD enhancement on kinematic PPP solutions is marginal. It is suggested that other factors, such as effects of ionosphere, incorrectly fixed ambiguities, may be the more dominating, deserving further research attentions.

半导体量子阱结构中的电生子互相作用与热载流子弛豫

Submitted by zhangdi (zhangdi@red.semi.ac.cn) on 2009-04-13T11:45:31Z

Troupes anglaises à Constantinople : [photographie de presse] / [Agence Rol]

Référence bibliographique : Rol, 59800

Programa de desarrollo de la inteligencia : aplicado al currículum (PDIAC). Primer curso educación primaria.

Se presenta el Programa de Desarrollo de la Inteligencia Aplicado al Currículum (P.D.I.A.C.) que incluye contenidos curriculares del área de Conocimiento del Medio Natural, Social y Cultural de la educación primaria. Se estructura en seis niveles diferentes para cada curso de primaria, el primero de los cuales se corresponde con este cuaderno. Se compone de los siguientes factores: estrategias generales cognitivas, estrategias de lenguaje, inteligencia social, estrategias de autoobservación, autorrefuerzo y motivación. Los temas que plantean las actividades son: el cuerpo, los ríos y las montañas, el agua, los animales, +de qué están hechas las cosas?, los pueblos, ciudades y los trabajos, y las máquinas.