Everywhere you look there are 3's because 3 is the ultimate number that the universe as we know and perceive it is built upon ...

In this paper, a novel three-dimensional coordinate positioning algorithm based on factor graph is proposed to improve the measurement accuracy of the indoor global positioning system (iGPS) under ...

In the process of low orbit satellite navigation search and rescue, there is significant relative motion between the satellite and the ground, resulting in substantial Doppler frequency shifts. Spread ...