Single Epoch Carrier Phase Positioning for Indoor Pseudolite Systems

Carrier phase positioning with indoor pseudolite can achieve high-precision positioning and has received extensive attention. Correct ambiguity resolution (AR) is the key to carrier phase positioning. However, the complex indoor environment has serious blocking, which can lead to signal interference and cycle slips. Existing methods, like the OTF method and the KPI method, are unable to deal with these problems. This paper proposes a single epoch carrier phase positioning algorithm for indoor pseudolite systems, which is more resistant to interference and cycle slips. The algorithm consists of a positioning algorithm and a validation algorithm. The positioning algorithm searches in the ambiguity domain for the smallest carrier phase residuals to achieve AR, and then realizes high-precision positioning. The validation algorithm evaluates positioning results through the residual ratio and eliminates the positioning results that may have errors. Numerical simulation proves the effectiveness of this algorithm.