An efficient method for carrier phase ambiguity resolution in GPS attitude determination

Integer ambiguity resolution is a key problem of GPS attitude determination system. A modified ambiguity resolution method based on LAMBDA is proposed in the paper. First, regularized least-squares algorithm is used in the float value estimation, and LAMBDA algorithm is applied in the ambiguity search to improve search efficiency. Then, baseline length information is used to reduce the number of epochs required for ambiguity resolution. Finally, a modified ratio test is proposed to assure the correct integer ambiguity to be chosen.