Geodetic Applications of the Texas Instruments TI 4100 GPS Navigator

des Instituts für Geodäsie

Heft 20-2/1985

Geodetic Applications
of the Texas Instruments TI 4100 GPS Navigator

Texas Instruments Incorporated, Lewisville / 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 20-2, Neubiberg, S. 405-423.


When first conceived 12 years ago, the Global Positioning System (GPS) was designed to provide absolute, three-dimensional, real-time navigation with accuracy in the 10-meter range. When combined with state-of-the-art GPS receivers, GPS can provide precise relative position accuracies in the centimeter (and millimeter) range.

This paper presents the receiver design and data of the TI 4100 GPS Navigator - a GPS receiver designed to optimally meet the demanding relative positioning accuracy requirements of the geodetic surveyor, in addition to the real-time needs of the standard navigation community. Two TI 4100 systems (standalone) collect all the data necessary for better than first-order, three-dimensional baseline determination. Standard off-the-shelf TI 4100 systems collect simultaneous raw observables of time-tagged code state and carrier phase (full cycles and fractions). Also provided by the TI 4100 are the real-time navigation solution and the broadcast ephemeris required by postprocessing software to determine precise baselines. Preliminary postprocessing results using broadcast ephemeris are presented in this paper.

The receiver subsystem of the TI 4100 is identical to the advanced geodetic receiver supplied by Texas Instruments under contract to the National Geodetic Survey (NOAA/NGS), the Defense Mapping Agency (DMA), the U.S. Geological Survey (USGS), and the Naval Surface Weapons Center (NSWC). These systems are planned for use during the 1980s and 1990s as the GPS standard for establishing geodetic control.

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