نتایج جستجو برای: global positioning systems

تعداد نتایج: 1594635  

2007
Pratap N. Misra

• The combination of signals planned to be available for civil use from the U.S.'s Global Positioning System (GPS) and the former U.S.S.R.'s GLONASS system offers the promise of an accurate and economical sole-means navigation system for civil aviation. An FAA-sponsored program at Lincoln Laboratory has examined the technical issues associated with the integrated use of the two autonomous syste...

2005
Ravinder Kumar L. Umanand

A methodology for developing a simple theoretical model for calculating global insolation on a horizontal surface is described in this paper. The input parameters to the model are the latitude of the desired location and the amount of total precipitable water content in the vertical column at that location. Both the parameters are easily measurable with inexpensive instrument such as global pos...

1995
Y. E. Bar-Sever

Proper modeling of the Global Positioning System (GPS) satellite yaw attitude is important in high-precision applications. A new model for the GPS satellite yaw attitude is introduced that constitutes a significant improvement over the previously available model in terms of efficiency, flexibility, and portability. The model is described in detail, and implementation issues, including the prope...

1997
R. Linfield

Comparison of simultaneous Global Positioning System (GPS) and water vapor radiometer (WVR) measurements at Goldstone over 82 days in the period between June 25 and October 6, 1996, shows agreement in zenith wet path-delay estimates to <6 mm rms. The level of agreement is consistent with the expected levels of GPS and WVR errors. This method shows considerable promise for improving the accuracy...

2010
Paul H. Lord

The Global Positioning System (GPS) is a U.S. military system made possible by 24 satellites in precise orbits circling the earth's surface twice daily (Garmin Corporation@, 1998; Connolly, 1998). GPS technology has been in widespread use in the civilian sector for most of the last decade. Nevertheless, it is not often considered for lake mapping because it is not as precise as traditional surv...

2007
Bruce G. Wilson

In November 2003, the City of Hamilton, Ontario, Canada equipped five solid waste collection trucks with Trimble Telvisant CrossCheck® GPRS 1900 Mobile data recorders. Three of the trucks are garbage packers, the fourth truck is a side-loading recycling truck, and the fifth vehicle is a 60/40-split co-collection truck equipped with a cart lifter. These trucks operated in a variety of situations...

2002
Judah Levine J Levine

I will discuss how time and frequency information can be distributed using satellites. I will focus on using the signals transmitted by the US global positioning system satellites, but I will also discuss other satellite-based systems such as the Russian GLONASS system, the proposed European Galileo System and two-way satellite time transfer, which uses active ground stations that communicate w...

2008
G. E. Hilley K. M. Johnson M. Wang Z. - K. Shen R. Bürgmann

Fault slip rate estimates along the Altyn Tagh and Kunlun strike-slip faults in northern Tibet vary considerably between short-term geodetic and long-term geologic studies. Here we reanalyze and model all global positioning system (GPS) data from northern Tibet to determine if these differences might be explained by previously unmodeled transient processes associated with the earthquake cycle, ...

2008
F. D. Chu C. C. Lee

We have examined the ionospheric plasma irregularities that were recorded by using three ground-based receivers of the global positioning system (GPS) located at Brazilian longitudes during the period of a complete solar cycle, 1995–2005. The statistic results show that ionospheric irregularities are very easy to occur in December solstice months but rare to occur in June solstice months. Besid...

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