With a total of four new regional and global navigation satellite systems that have launched first satellites or even started an operational service, the GNSS landscape has experienced major changes in recent years. As part of the Multi-GNSS Experiment (MGEX) of the International GNSS Service (IGS), a global network of multi-GNSS monitoring stations has been established and various analysis cen...

In recent years there appeared a need for astronomical observations timed with sub-millisecond accuracy. These include e.g. timing stellar occultations by small, sub-km or fast Near Earth Asteroids, but also tracking artificial satellites at Low Orbit using optical sensors. Precise astrometry of fast-moving satellites, and accurate have parallel needs, requiring reliable time source good knowle...

The increasing interests in using renewable energies are coming from solar thermal energy and solar photovoltaic systems to the micro production of electricity. Usually we already have considered the solar tracking topology in large scale applications like power plants and satellite but most of small scale applications don’t have any solar tracker system, mainly because of its high cost and com...

This paper demonstrates a GPS receiver research platform. It can generate digital Immediate Frequency (IF) GPS signal and some signal synchronize functions on high dynamic and weak signal environment. It is based on a mathematical signal model which expresses the digitized IF GPS signal as a function of various errors during propagation. The simulator is able to simulate more than 12 GPS satell...

This paper represents a new active phase array antenna for Ku-band mobile service that will be possible in satellite broadcasting service. The main idea for the antenna is to use minimum active array element with cost-effective one-dimensional subarrays with inclined pencil beam structure for 34 dBi gain. For this antenna, we also used the squint beam tracking algorithm. This tracking gives dif...