The Study Of Differential Positioning And Attitude Determination Using GPS

In terms of common people around the world,GPS system is most often used for navigation and location.Attitude measurement is a new application of GPS following navigation and location.Based on the concrete research and development of mapping handset,this thesis first goes over the formation and common coordinate system of GPS,the composition of GPS satellite signals,the principles of navigation and location,pseudo-range measurement technology,carrier phase measurement technology,differential positioning technology and positioning error of GPS system.Then it focuses on the basic principles and concrete implementation scheme of GPS differential positioning technology,and discusses the basic principles of GPS attitude measurement.Next,on the basis of a thorough understanding of relevant theories,the author relates to specific technological needs of the project research and development,combines concrete application environment,design cost and application field,etc,and works out the concrete technology implementation scheme of single frequency GPS pseudo-range differential positioning and dual-frequency GPS carrier phase differential positioning with wireless transmission module,single frequency GPS card and dual-frequency GPS card,through which single frequency GPS pseudo-range differential positioning and dual-frequency GPS carrier phase differential positioning are realized and GPS positioning precision is effectively improved.After that,the thesis elaborates the attitude measurement technique with single baseline composed of dual-GPS antenna,and figures out the concrete attitude measurement scheme using GPS.Finally,the author points out some problems in the actual implementation process of the design,analyzes the causes of error in great details,and gives some suggestions for further research about the improvement of system precision,the implementation of GPS attitude measurement design,and the analysis of errors in system positioning.Innovation points of this thesis:on the basis of GPS differential positioning,and investigating and analyzing the traditional RTK technology,pointing out the roundedness of RTK,the author of this thesis design a new plan,this plan can realize the auto changing-over between the base and rover,at the same time,this plan can reduce the cost,and also enlarge the work area.