Study of a New Pseudo-range Differential Method for the Correction of Ephemeris Error and Ionospheric Error

摘要

Pseudo-range differential is an important differential method, but the pseudo-range differential precision becomes decreased with the increase of distance between users and the reference stations. A new pseudo-range differential method is proposed, that is wide-area-weighted pseudo-range differential method. Six pseudo-range differential reference stations are built in China region, the user choose pseudo-range correction data of the reference stations near the user which use the weighted data as its pseudo-range correction, which can achieve high precision pseudo-range differential in wide area. Selection method of the right and reference station is researched, the method is verified by simulation test, the weighted data method of six, five, four and three reference stations for ephemeris and ionospheric error correction condition is analyzed, and simulation results show that: using the weighted pseudo-range observation error of the three stations nearest the users has the best correction effect among them, in the whole China region, which can achieve precision superior to 0.5m about pseudo-range differential.