The Global Positioning System

des Instituts für Geodäsie

Heft 20-1/1985

The Global Positioning System:
An Alternative to Six Degress
of Freedom Inertial Navigation

Naval Surface Weapons Center, Dahlgren / USA


In: WELSCH, Walter M. / LAPINE, Lewis A. (Hrsg.) [1985]:
International Federation of Surveyors - FIG -
Proceedings Inertial, Doppler and GPS Measurements for National and Engineering Surveys
Joint Meeting of Study Groups 5B and 5C, July 1-3, 1985

Schriftenreihe Universitärer Studiengang Vermessungswesen, Universität der Bundeswehr München, Heft 20-1, Neubiberg, S. 279-290.


This paper demonstrates the potential capabilities of the Global Positioning System (GPS) for determining a platform's orientation. Orientation plus positioning capabilities qualify GPS as an alternative to inertial navigation. Phase measurements were obtained from two TI4100 Geodetic Receivers connected to the same frequency standard and to two antennas on a static 25 m baseline. It is shown that if the integer number of cycles between the initial phase measurements is determined, the orientation of a platfrom can be calculated using phase measurements taken at the same time instant from four satellites.

The paper discusses conditions and potential procedures for determining this integer number of cycles. Instantaneous azimuth and elevation (yam and pitch) estimates are obtained from a series of measurements; the accuracy of these unfiltered estimates is discussed. The test case accuracies were found to be very close to values predicted by simulation.

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