A fast positioning method based on high-precision clock for GNSS receivers

Aiming at the problem of how to make use of the atomic clocks offered by Micro-PNT to make Global Navigation Satellite System (GNSS) receivers fulfill fast positioning with the recovery of the satellite navigation signal, this paper discusses the fast positioning method which omits the step of frame synchronization and proposes a constellation-triangle selecting algorithm based on high-precision clock. This method raises the speed of positioning by saving enormous time needed for the frame synchronization. Moreover, it ensures the positioning precision by eliminating the position error brought by omitting the frame synchronization procedure. Besides, the quantity of calculation is greatly reduced compared with the four-satellite positioning algorithm and GDOP selecting method. At last, positioning experiments of different methods are carried out adopting the data produced by ephemeris simulation software. The experiments indicate that the proposed method can accelerate positioning and ensure high precision of the positioning results with high-precision clock as well.