... Basic Observables: Zero-differenced phase and code ionosphere-free combinations of global GNSS network stations, corrected by P1-C1 satellite code biases (cc2noncc), daily observations with 30 seconds sampling rate Sites coordinates : IGb08 reference frame coordinates and velocities Displacements: solid tides, ocean loading, pole tide loading (IERS 2010) Geometric model : Receivers antennas eccentricities, absolute receiver and ...

University Satellites and . Space Science Education . ... Accurate Satellite Trajectory Determination Using IGS Precise Ephemeris . ... International Global Navigation Satellite Systems Service (IGS) let users of satellite navigation systems free access to the information of rather precise coordinates of every satellite in Greenwich coordinate system with two week delay. ... As a result of applying this algorithm the trajectory of every satellite was defined as precise as IGS data. ...

... Up: Data Analysis and Processing Techniques . ... Also, a method for quality control of CCD observations is suggested. ... Everyone who observes a celestial object using a CCD detects moving celestial objects as a ``by product''. ... We hope that our investigations may be useful for near-Earth space control and also for searches of the moving celestial objects through analysis of old and new CCD frames obtained at any amateur or professional astronomical observatory. ...

XMM-Newton Science Analysis System Page: 1 orbit July 8, 2007 Abstract Create a FITS timeseries \HK-like" le from the ODF Spacecraft Reconstructed Orbit File. ... Both sets of values will be written into a standard OGIP-compliant FITS binary extension table with a TIME column value, derived from a start, stop and sampling interval time, each speci ed by the user. ... StartANDEndNotInODFRange (error) Start AND End times selected not congruent with input ODF obs times. ... SAS ODF must be properly set. ...

Basics of magnetosphere satellite experiment. Main steps of data processing. Modern conception of Earth magnetosphere. ... Empirical models of the bow shock, magnetopause and neutral current sheet positions. Main principles of construction of empirical magnetospheric magnetic field models. ... Current systems in the Earth magnetosphere. Chapman- Ferraro current. ... Tsyganenko 1996 model and its application to satellite data processing. ... Basics of statistical data analysis. ...

... 8, ``Celestial Mechanics'', 2002 First results of GPS orbit determination with GRAPE package using a square--root information filter M. O. Keshin Institute of Applied Astronomy, St. Petersburg, Russia The zero--differenced carrier phase measurements contain the distance be­ tween the phase centres of receiver and transmitter antennas biased by unknown integer number of cycles (phase ambiguities). ... In the case of GPS the problem of solar radiation pressure modelling is of primary importance. ...

... The overall globular cluster population is divided by gap in the metallicity function at [Fe/H]=-1.0 into two discrete groups with well-defined maxima at [Fe/H]=-1.60?0.03 dex, and -0.60?0.04 dex. ... Clusters with extremely blue horizontal branches occupy a spherical volume of radius ~ 9 kpc, have high rotational velocities ( V rot =77?33 km/s), have substantial and equal negative radial and vertical metallicity gradients, and are, on average, the oldest group (the old-halo subsystem). ...

... CentralProcessor 0.11 documentation . ... Most of the time, these will be generated using the ACES footprint.py tool, and so all you need to specify are the footprint name, the position angle and pitch (separation of beams), and the frequency band you are observing in. ... If you have not loaded the ACES module, it is likely the footprint.py task will fail, and mosaicking will be disabled. ... User Parameters - Continuum Self-calibration . User Parameters - Continuum Source-finding . ...

... YREF: Reference Files . ... Aperture Parameters, Aperture Position parameters . ... FOS reference data consists of 9 reference file types and 15 table types. ... FOS reference files =============== ASSOCIATED DATABASE ROOT EXTENSION FILE _TYPE DATA QUALITY FILE RELATION -------------------------------------------------------------------------- ROOTNAME.R0H FOS FILE and ROW ROOTNAME.R0D BAC (BACKGROUND) ROOTNAME.R1H ROOTNAME.R1D FLT (FLAT FIELD) ROOTNAME.R2H ROOTNAME.R2D IVS (INVERSE ...

pa is the position angle of the major axis of the isophote 25 mag/arcsec**2 in the B-band for galaxies. It is counted from the North ( pa=0 ) toward East between 0 and 180 . The position angle is defined in the B1950 coordinate system, but the differences introduced by the precession are generally within the precision of the measurements. The length of the major axis is defined in the parameter logd25 , and the axis ratio in the parameter logr25 . ... HyperLeda . ...

The following parameters as a function of the universal time are enclosed in this file. 1. no . ... Universal time date (YYYYMMDD) . ... Universal time (.hhmmss) . ... Geomagnetic local time in the satellite position . ... geomagnetic latitude . ... co-ordinate - . ... system . ... co-ordinate system . ... Solar-ecliptic co-ordinate - . ... Satellite velocity . ...