Impact Assessment of the Asynchronous Clocks Between Reference and User Receivers in Differential Pseudolite Navigation System

Compared with the Global Navigation Satellite System (GNSS), asynchronous pseudolite (PL) navigation system does not provide corrections for frequency deviation between PL signals. To realize precise positioning, a reference receiver is utilized to reduce effect of PLs via differential method using carrier phase measurements. However, there exists time user and receivers due their clocks. With this deviation, cannot be removed thoroughly. Theoretical derivation experimental verification indicate that residual error in double difference measurements proportional receivers. solve problem, two approaches, refer hardware software methods, are proposed, which experimentally proven feasible.