A new approach to calibrate pseudolite position using multi-antenna and carrier phase measurement without cycle ambiguity

Abstract

This paper proposes a new approach to calibrate positions of pseudolite antennas. Conventional method uses inverted-GPS algorithm with carrier phase measurements collected at several points whose positions are known. The most significant problem of this method is the weakness to the change of cycle ambiguity values due to the occurrence of cycle slips or lock losses. Once the cycle ambiguity values are changed, the measurements become unusable and we must re-collect corresponding channel's measurements from beginning. This inefficient process of conventional method makes it take too much time and effort. Introducing the multi-antenna which is proposed in this paper, the ambiguity can be eliminated epoch by epoch for every single carrier phase measurement. Moreover, the number of calibration points can be reduced down to 3 by use of measurements collected at unknown positions. Using proposed methods, the process of collection of carrier phase measurements becomes considerably simple and comfort. Simulation results are presented to verify proposed algorithms.