Autonomous drifting buoys that acquire position data using Global Positioning System (GPS) navigation have proven valuable in Lagrangian measurement applications requiring greater accuracy and data density than is available through other technologies such as ARGOS satellite tracking. The limits on measurement accuracy in a GPS drifter are set by the geographic accuracy of the GPS position. Stan...

Gregory Johnson is a Senior Program Manger at Alion Science & Technology, JJMA Maritime Sector. He heads up the New London, CT office which provides research and engineering support to the Coast Guard Academy and R&D Center. He has a BSEE from the USCG Academy (1987) a MSEE from Northeastern University (1993) and a PhD in Electrical Engineering from the University of Rhode Island (2005). Dr. Jo...

Interest in the study of global gravitational models has increased recently all over world because it is necessary for height datum transformations. Today International Center Global Earth Models (ICGEM) provides largest collection produced through data from satellite's missions CHAMP, GRACE, and GOCE ... Etc. To allow easy access internet with its more intelligent technologies, one Gravity Org...

Solar cycle 23 is expected to reach a maximum in the year 2000. This has produced a recent flurry of research about the possible adverse effects of the ionosphere on the millions of GPS users. The introduction of the Global Positioning System (GPS) ushered in a new era of affordable precise navigation. Differential GPS (DGPS) corrections have reduced positioning errors from about 100 meters to ...

People’s Republic of China is one of the most rapidly developing countries in the world today. There is a great demand on highly actual and accurate spatial information of the whole country, especially of West China which becomes the focus of development of the Chinese government right now and in the next years, but where still not enough topographic maps are available. This raises great challe...

As the computational power of mobile devices increases, so does the demand for more sophisticated applications and services. In particular the demand for location-aware services is likely to increase substantially. Such services will vary in how accurate a position solution they will require. However, there can be little doubt that some will require an accuracy that can only be provided through...

Die Erfassung und Vermittlung sowie der Erwerb vielfältiger für erfolgreiches Lehrkrafthandeln bedeutsamer Kompetenzen bilden wichtige Inhalte aktuellen Lehrerbildungsforschung. In vielen Projekten Qualitätsoffensive Lehrerbildung (QLB, BMBF, 2014) werden beispielsweise Erkenntnisse zur relevanter Kompetenzfacetten, zum Verhältnis von Theorie Praxis zu einer wissenschaftsbasierten Wissensvermit...

Autonomous GPS and three differentially corrected GPS (DGPS) sources were tested under static conditions to assess suitability for precision agriculture applications in the vicinity of Hays, KS. DGPS sources included the U.S. Coast Guard Beacon, Wide Area Augmentation System (WAAS), and OmniSTAR, a commercial service. Both WAAS and OmniSTAR broadcast correction messages from geostationary satel...

GRINGO (GPS RINEX Generator) is a program which has been developed at the Institute of Engineering Surveying and Space Geodesy (IESSG) at the University of Nottingham, to record the pseudorange and full carrier phase data from 12-channel Garmin handheld GPS receivers, in standard RINEX (Receiver INdependent EXchange) format. It offers owners of these receivers the possibility of post-processing...