Principle And Algorithm Research For MAC

MAC is a novel network RTK technology, which sends the corrections difference using standard data format. It overcomes all of the weakness of the previous network RTK technology and gradually gaining a wide range of applications. Because of its theoretical research involves much proprietary information, the study of this theory is very little in china. In this paper, author through network data collecting, processing, computing, distribution and services to achieve a more in-depth study of the MAC positioning technology, and elaborate the principle and the realization method of MAC technology, provide a more complete idea of the master-auxiliary station. At the same time, the research work done for follow-up technology accumulation. The main work of this article includes the following aspects:In this paper, the origin and characteristics of network RTK was talked about, network RTK techniques and traditional RTK techniques are compared from five aspects. There introduced several major network RTK technology, including the VRS technology, FKP technique, CBI technology, ARS technology, and MAC technology which is major object of study in this paper. Then, based on the results of the analysis put forward three key technologies in MAC, chief among them is the solution of ambiguity and the arithmetic of the corrections differential, and pointed out that the realization of master-auxiliary station must first solving the above two questions.Conduct a study aim at location algorithm of MAC to clarify that correction difference can be resolved into two components: i.e., dispersive and non-dispersive parts, and they are the most important correction in MAC. Deduce the mathematical models of MAC technology and graphically explained in detail the common ambiguity level of meaning. Deduce the formula of correction, and carried out a detailed analysis in the rover applications.Describes the implementation process of the MAC, based on its hardware requirements, point out that the Continuously Operating Reference System is a platform in this process. Illustrates the data processing process and leads to a reference station and rover's basically protocol that is NTRIP and NMEA, which is used for communication. RTK's data format is based on the RTCM. It discusses the two correction methods of MAC technology, which is Master-Auxiliary Corrections and Individualized Master-Auxiliary Corrections, Finally, The latest RTCM Ver3.1 messages detailed analysis, and decoding of the message by programming.Described in detail the principles of several interpolation algorithms and models and their application of MAC technology, including the weighted average method, Linear Interpolation Method, Low-Order Surface Model, Partial Derivative Algorithm, Optimization Triangle Interpolation Algorithm and Least-Squares Collocation, at last a detailed derivation of the formula for generating correction.