What is an “epoch” and how does this cause a GPS Week Rollover issue?

In the past decades, Global Navigation Satellite Systems (GNSS) have revolutionized positioning and navigation activities…

Geological data show that the region of Central-west Bulgaria is characterized by the presence of active deformations and modern seismic activity. The southern region of Sofia shows a complex tectonics formed by the intersection of several active faults.

Due to rapidly increasing applications of GNSS dependent systems, motivation has increased to spoof these signals for illegal or concealed transportation and to mislead receiver timing used by critical infrastructure. Detection and mitigation of spoofing…

In the last few months we have been witnessing a remarkable (and, to some extent, surprising) increase of interest for GNSS high accuracy positioning, involving both systems and receivers.

Reports of problems with GPS appear with increasing frequency. As two of many examples:

Those in the GNSS/PNT community will say it’s because virtually every technology uses GNSS signals, and most depend upon them. When signals are disrupted, something bad could happen.
But how likely is that? What is the risk and are we willing to take it? These are questions that many governments are starting to ask.

Now a days more than hundred Global Navigation Satellite System (i.e. GPS, GLONASS, Galileo, Beidou, and IRNSS) signals are available everywhere all the time at free of cost. Hence, dependency on the GNSS technology has been…

Isro develops desi atomic clock, to be used in navigation satellites
In a significant development, Indian Space Research Organisation (Isro) has developed an atomic clock that will be used in navigation satellites to measure precise location data. The space agency currently imports atomic clocks from European aerospace manufacturer Astrium for its navigation satellites.
Tapan Misra, …

Precise levelling is a traditional method to measure height differences. Currently work stages are performed by hand. In this paper the challenges of robotizing precise levelling measurements are discussed. The difference to the existing solutions…