Range distance compensation algorithm for assisted GNSS positioning

In this paper a positioning algorithm based on range distance compensation is proposed for the condition of only three visible satellites, making User Equipment (UE) get location information more effective when the quantity of satellites acquired can´t satisfy solving condition. Using the structure of Assisted Global Navigation Satellite System (AGNSS) positioning system, UE is guaranteed to acquire navigation information of the three visible satellites rapidly, and with the compensation of range distances between UE and two adjacent base stations, which is obtained from the auxiliary services, the three visible satellites´ data constructs a full-rank equation set to achieve positioning. By analyzing positioning results and accuracy, it is indicated that the confidence of this method´s positioning error, according to 3GPP request of assisted satellite navigation accuracy error within 50m, reaches 94.56%. The validity of this algorithm is demonstrated, and a novel methodology for researching in AGNSS positioning performance enhancement is proposed.