Mathematical theory of the Goddard trajectory determination system

Basic mathematical formulations depict coordinate and time systems, perturbation models, orbital estimation techniques, observation models, and numerical integration methods

GEODYN operations description, volume 3

The operating and set-up procedures for the multi-satellite, multi-arc GEODYN- Orbit Determination program are described. All system output is analyzed. The GEODYN Program is the nucleus of the entire GEODYN system. It is a definitive orbit and geodetic parameter estimation program capable of simultaneously processing observations from multiple arcs of multiple satellites. GEODYN has two modes of operation: (1) the data reduction mode and (2) the orbit generation mode

National Geodetic Satellite Program, Part II: Smithsonian Astrophysical Observatory

A sequence of advances in the determination of geodetic parameters presented by the Smithsonian Astrophysical Observatory are described. A Baker-Nunn photographic system was used in addition to a ruby-laser ranging system to obtain data for refinement of geodetic parameters. A summary of the data employed to: (1) derive coordinates for the locations of various tracking stations; and (2) determine the gravitational potential of the earth, is presented

Atmospheric densities from Explorer 17 density gauges and a comparison with satellite drag data

Atmospheric density data from Explorer XVII GAUGES and satellite drag dat

Compendium of Applications Technology Satellite user experiments

The achievements of the user experiments performed with ATS satellites from 1967 to 1973 are summarized. Included are fixed and mobile point to point communications experiments involving voice, teletype and facsimile transmissions. Particular emphasis is given to the Alaska and Hawaii satellite communications experiments. The use of the ATS satellites for ranging and position fixing of ships and aircraft is also covered. The structure and operating characteristics of the various ATS satellite are briefly described

Ionospheric perturbations on STADAN VHF tracking accuracy

Ionospheric perturbations on STADAN very high frequency tracking accurac

How to Connect the Americas: An IS/IT Academic Research Plan for Tomorrow

During the last decade we have engaged in several heretofore separate and at least initially, somewhat independent research initiatives: 1) Virtual teams and collaborative technologies [Ballantine, Becker, et. al.; 1999], [Becker, Ballantine, et. al., 1999, 2001], [Becker; 2003], [Becker and Cline; 2005]; 2) building bridges between researches across the borders of the Americas [Becker and Sanchez; 2006, 2007, and 2008]; and 3) analyzing the dramatic and alarming declines in IS/IT majors [Becker, Hassan, and Naumann, 2006]. Within the last few years we have come to discover that these research streams appear to be converging in a welcome and pleasantly synergistic manner. When combined these research streams result in an action plan to utilize a combination of virtual collaborative technologies and face-to-face interactions with faculty and students throughout the Americas to increase the number of IS/IT majors at all educational levels: undergraduate, masters and doctoral degrees. This paper describes what brought us to this epiphany and my plan for the next year-long phase of this study, which will commence in summer 2009 for this author. A partial list of the planned activities, objectives and metrics are shown in Appendix

Vanguard - A history

Discussing origin, course of development, and results of Vanguard Projec