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, ...

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...

In this contribution we give a brief review of the theory of integer estimation as it has been developed for use with the Global Positioning System (GPS). First we consider the GPS observation equations (GPS and Integers). These observation equations are not of the usual type, since some of the parameters are known to be integer. This implies that an extention of ’classical’ adjustment theory i...

Accurate navigation on the moon, Mars, or any other astronomical body is essential to scientific investigation. The research presented in this paper covers the constellation design of a Lunar Global Positioning System (GPS) using the CubeSat platform. Since CubeSats have significantly smaller dimensions than most current satellites, their associated cost is much less to place into orbit. This c...

One of the most difficult and expensive tasks in making noise pollution maps is the collection and processing of the data needed to create acoustic models. In the case of road traffic noise maps, obtaining speed data for light and heavy vehicles a problem that has usually been avoided by using a road’s speed limit or by making assumptions based on experience from similar road types. Here global...

This report describes a simulation model developed to evaluate the impact of using Intelligent Transportation Systems (ITS), such as Global Positioning Systems (GPS) for bus tracking, on controlling buses in wide-area transit networks. Control strategies with ITS will be compared against those without ITS (i.e., they do not rely on communication or tracking). The model is developed using a gene...

The global positioning system (GPS) provides accurate positioning and timing information that is useful in many applications. In particular, portable consumer GPS applications require cheap compact low-power receivers. This 115mW receiver, implemented in an analog 0.5μm CMOS technology, comprises the entire radio-frequency (RF) and analog sections in addition to the local oscillator (LO) freque...

A Global Positioning System (GPS) network in the polar cap, along with ionosonde and SuperDARN radar measurements, are used to study GPS signal amplitude phase scintillation associated a cap patch. The patch was formed due north-to-south transition of interplanetary magnetic field (IMF Bz). moved antisunward an average speed ~600 m/s lasted for ~2 h. Significant occurred on leading edge patch, ...