Research And Implementation Of RTK Positioning System Based On Ntrip Protocol

Global navigation satellite system positioning technology is gradually maturing and playing an important role in military,aerospace,agriculture,Internet of things,transportation and other industries.In order to improve positioning accuracy,Real Time Carrier Phase difference(RTK)technology is the most widely applied technology at present.Combining navigation and positioning technology with communication technology,it makes centimeter-level high-precision positioning.And it plays an important role in the field of dynamic high-precision position of demand.Based on the development of positioning technology,this topic carries out the research of RTK positioning system based on NTRIP protocol.The main work contents are as follows:(1)This paper studies the relevant technology and theory of RTK system,including RTK system and NTRIP protocol,analyzes the composition and working principle of RTK system,discusses the composition structure and basic principle of NTRIP protocol,as well as the format and content of messages that each part communicates with each other.(2)Based on the theoretical research of RTK system,the overall design framework of RTK system is proposed,including reference station,mobile station,wireless transmission equipment and server.Based on the overall framework,complete the selection and design of the system hardware,select appropriate reference station and mobile station positioning board and complete the relevant configuration,design the hardware part of wireless transmission equipment.(3)The design of RTK system software is divided into wireless transmission equipment software design and server software design,that is,NTRIP Caster software design.Based on the wireless communication mode of mobile station and server,the wireless transmission equipment can collect and upload the mobile station positioning data in real time.Based on NTRIP protocol,the real-time differential data of the reference station and the positioning data of the mobile station are obtained,and the data is analyzed and processed according to the differential data format.Then,the differential data is sent to the mobile station.(4)This topic completes the overall layout of RTK system.A complete RTK system is built based on the overall framework by using the base station and mobile station successfully configured and the wireless transmission equipment and server software successfully debugged.Finally,the positioning accuracy of the system is tested.