Research On GPS Precise Point Positioning Ephemeris And Clock Error

GPS Precise Point Positioning (PPP) uses un-differenced phase observation along with IGS and other data center to provide precise orbit and the precise satellite clock ,for stand-along geodetic point positioning, Its precision can reach level even cm-level honour. This article is mainly has carried on the development status of Precise point positioning and carriage and product specifications of IGS, Analyzes the importance of the precise point positioning in get real-time high-precision satellite star calendar. In addition Introduces the IGS product format indicates, Precise Point Positioning the main error sources and error correction model, GPS the difference of Precise Point Positioning principle, etc. the primary coverage includes:(1) Precision star calendar research, Detailed introduces two kind of interpolation methods and two fitting methods, achieves various methods through matlab and comparees results of kinds of methods, Analyzes different algorithms' characteristics and adventages and disadvantages, draw the four methods by interpolation results which can satisfy the single point positioning requirement, whatever precision and coordinate difference are the same of two fitting method in calculating the order number diam-eter.(2) Precision Clock Bia research,Through in matlab programming, realize three algorithms interpolation, fitting of two different atomic cloeks(Rb or Cs),and analyze three algorithms for that, the Features and merits of these algorithms.The results shows Chebyshev interpolation is the best.