Modifications to Fotonap
Abstract
The Fotonap program has been modified (1) to include the option to compute the desired solution without inverting the normal equations matrix (thus not obtaining the solution covariance matrix), and (2) to include the capability to handle Geoceiver measurements. For a typical run involving photogrammetric data, implementation of item (1) reduced the time taken to obtain the normal equations solution from 1 hour 50 minutes to 20 minutes. Two types of Geoceiver measurements have been modeled in Fotonap: satellitetoground and satellitetosatellite. Each Geoceiver type may use either a fixed or a variable averaging time. Included in the implementation of the Geoceiver measurements is the Hopfield model for computing tropospheric refraction corrections. The above modifications have been implemented both on the UNIVAC 1108 and the CDC 6400 versions of Fotonap.
 Publication:

Final Report Old Dominion Systems
 Pub Date:
 July 1977
 Bibcode:
 1977odsi.rept.....M
 Keywords:

 Computer Programs;
 Integral Equations;
 Mathematical Programming;
 Geodetic Satellites;
 Matrices (Mathematics);
 Radio Receivers;
 Univac 1108 Computer;
 Launch Vehicles and Space Vehicles