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gpscom.html - 96Dec26

Gpscom

A program for the combined adjustment of multiple GPS data sets initially processed by the program Pages

Overview

The program Gpscom is a simple Helmert Blocking normal equation processor which combines multiple GPS data sets that have initially been processed by the program Pages to form and partially reduce normal equations eliminating numerous nusiance parameters which are not generally of interest in a large global adjustment. The normal equation elements for the global parameters, those to be passed on to a combined adjustment, are written by Pages into a normal equation file which becomes the basic input data for the program Gpscom. One or more of these files as well as its own output normal equation files can then be processed by Gpscom to provide a combined adjustment of the global parameters.

This program was written in FORTRAN. Predominantly ANSI standard FORTRAN, a few isolated routines query the operating system for time and date, user and system identification. These "system" routines are inherently non-portable but, should be easily modified or disabled.

Making Combined Adjustments

Input Data Files

Input Data List
Normal Equation Files
Problem Definition File
Site Information File
Antenna Calibration File, or for more information see antenna calibration project).

Output Files

Global Print File
Sinex File
Normal Equation File
This file contains the combined normal equations for all of the input files after any currently local parameters are eliminated from the matrix. The file is written out before any constraints are applied for the adjustment, therefore, as the formats are the same, this file can be used as an input normal equation file for a subsequent combined adjustment. The use of these files as subsequent input to Gpscom allows one to set up large adjustments with multiple levels of Helmert blocking.
Solution, Inverse File
The contents of this file are the inverse of the normal equations and the associated parameter adjustments computed after the necessary constraints have been applied. This file has the same format as the input normal equation file noted above.

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gpscom.html
March 4, 1999
Bill Dillinger