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This program was written in FORTRAN. Predominantly ANSI standard FORTRAN 77, a few isolated routines query the operating system for time and date, user and system identification. These "system" routines are inherently non-portable but, because they are isolated, should be easily modified or disabled.
ASCII header file
(REQUIRED) | The ASCII header file provides the most basic site information and serves to initialize descriptive data structures used internally in pages. |
binary data file
(REQUIRED) | The binary data file is the data source. In addition, the tropo correction stored in the data file can be used. This option is preserved for compatability with older programs. |
binary orbit file
(OPTIONAL) | Although pages can read and use the binary orbit file, it does not if a precise ephemeris is specified. Note, however, that if no precise ephemeris is available, the database can be created and editted using the broadcast orbit. A preliminary pages solution can also be made using the broadcast orbit stored in the database for manual editting and other quality control reasons. When a precise ephemeris becomes available, the final pages solution can be generated without recreating or re-editing the database. |
pages.inp
(REQUIRED) | pages.inp controls the parameters to be estimated and describes the databases to be used. |
pages.skl
(REQUIRED) | pages.skl controls the models used and defines any constraints to be applied in the solution. A description of older, no longer supported options is also available. |
ephemeris
(REQUIRED) |
- the broadcast orbit can be used through
database's binary orbit file
- the SP1 format, - the SP3 format, - a binary format ephemeris, generated by the arc program, used internally for orbit generation. |
antenna
phase correction file
(OPTIONAL) | The ant_info file corrects for differences is the electrical characteristics of the antennas. These differences have a strong observation elevation dependence and strongly alias into the tropo corrections and estimated height above ellipsoid for the site. Therefore, use of this file is strongly urged. The ant_info file name is entered through the pages.skl file. This is an ASCII file and is provided by outside source such as NOAA or the IGS. |
site information file
(OPTIONAL) | The site information file
is designed to provide a complete description and history of a tracking
site. This description will include coordinates, velocity, receiver,
antenna and any changes to these data time tagged with the date the
change becomes effective. A
site information file
is binary but can be
viewed with the xsites program.
The
site information
file names are entered through
pages.skl. Currently, a maximum of five
site information files can be used in
one pages solution. The heirarchy used in such a case is
|
break files
(OPTIONAL - but very common) |
Automatic or manual editing can attempt to repair cycle slips by
indicating the time of the slip to pages and forcing the program
to estimate a new phase ambiguity starting at that time. The break files
contain this information.
NOTE: a naming convention is enforced. Each break file contains instructions for one database. To strengthen this tie, these files must be named with the the database name plus the extension .brk. |
integer files
(REQUIRED - for bias fixed solutions) | Integer files contain the values to which phase ambiguities should be fixed. |
leap seconds
(OPTIONAL) | The dates of all leap seconds since January, 1980, the start of GPS time. By default, the program looks for this file in the current directory. The program will also recognize the file name leapsec.dat. |
RINEX
met files
(OPTIONAL) | Surface met data are input through the RINEX met files. By default, a surface met model, dependent upon site latitude, height and the date is used to create the a priori tropo model and corrections. However, if available, pages can use surface met data rather than the default model. This detail modelling is essential for precipitable water vapor estimation. |
leap.sec
(REQUIRED - when using a binary ephemeris) | The dates of all leap seconds since January, 1980, the start of GPS time. By default, the program looks for this file in the current directory. |
pole.
(REQUIRED - when using a binary ephemeris) | The X and Y polar motion parameters. This file will be provided from an outside source. |
ut1.
(REQUIRED - when using a binary ephemeris) | The TAI - UT1 difference in time standards. This file will be provided from an outside source. |
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