Research about calculating Beidou dual-frequency combination fixed wide lane ambiguity

Abstract

In view of the key technology of solving ambiguity of high precision move positioning, due to the traditional LAMBDA method to solve ambiguity, the passage improve and put forward a double-frequency observation model calculating ambiguity wide lane. Combined with the observation model and partial data, through self-programming for any four Beidou satellites wide lane ambiguity and satellite ambiguity solving process was simulated. The simulation results show that on the one hand, double-frequency wide lane portfolio model can be effectively applied to the fixed ambiguity, on the other hand, the ambiguity of solving process of the high reliability. For high precision move positioning, real-time solution of ambiguity is a difficulty and a focus research question, is also a key link in the process of decision system positioning precision. The current common methods of OTF generally require multiple epoch observation data, the high precision dynamic real-time meet sex is bad, so we need for the whole week ambiguity study of single epoch algorithm. However, the traditional single epoch ambiguity during the least-squares solution, tend to be less because observation epoch in observation method equation appear rank-defect phenomenon, causes are not present in the observation matrix inverse matrix to solve. According to the above problem, based on the analysis of the traditional method to solve the fuzzy degree, put forward a kind of linear combination based on double-frequency observation model, and through the step-by-step elimination method of solving ambiguity and the baseline vector, respectively. B , remember N αβ . Ambiguity and baseline vector of the observation equation containing two unknowns, for the convenience of solving, now through step-by-step elimination method expunction first one unknown, unknown to solve another stay. Take elimination unknown coordinate first, then determine the method of ambiguity, after elimination unknown coordinate, through the pseudorange and wide lane combination of observation equations can draw wide lane observation the ambiguity float solution of the factor and its covariance matrix, using the LAMBDA method based on covariance factor to determine the ambiguity search space of fixed. Finally, according to the linear relation, calculate 1 B and 2 B. In the process of solving 1 B and 2 B , using the same method to determine the ambiguity step by step. In double-frequency wide lane observations of carrier wave equation after elimination observations of 2 B , the observation equation containing to beg frequency ambiguity parameters 1 B and three