Research And Application Of An Algorithm For BDS/GPS Single-frequency Reverse NRTK Positioningg

With the rapid development of global satellite navigation and positioning system,location service has been used in every aspect of social life,people also more and more strong demand for high precision positioning,with the rapid development of network RTK positioning technology and the popularization,the high precision positioning has been applied in many fields,especially in disaster monitoring,atmospheric detection is widely used in fields such as,these applications need to the construction site of large-scale,however,the current commonly used dual frequency receiver cost is higher,limits the popularization and application of technology,this article in view of the present high precision cost problems in large scale,the beidou/GPS single frequency reverse network RTK key technology,the design and implementation based on real-time monitoring and early warning of geological disasters of GNSS software.The main research content and results of this article are as follows:(1)in view of the BDS/GPS integrated positioning involves the unification of the spacetime benchmark problem,time is commonly used in GNSS positioning system are introduced in detail and the coordinate system,and gives the BDS/GPS integrated navigation positioning system and the coordinate system in time benchmark and unified method.(2)the data pretreatment is divided into coarse-difference detection and removal and cycle detection and repair in GNSS navigation orientation.Introduced the commonly used method of gross error detection and eliminate,in view of the problem of cycle slip detecting and repairing,this paper introduced the high order single frequency according to differential method,doppler observation method,an adaptive filtering method.In this paper,the method of higher difference and doppler observation is analyzed,and the conditions of two methods are obtained.(3)this paper introduces the process of RTK positioning algorithm,elaborated on the establishment of the double difference observation equation and linear,morbid equation of processing and using the LAMBDA algorithm fixed ambiguity problem and other problems.Influence for single frequency receiver positioning error influence of the ionosphere,introduces the commonly used the ionosphere error correction model and double difference ionospheric correction method,this paper introduces the commonly used in network RTK ionospheric correction model.(4)the use of c # language,the design and implementation based on real-time monitoring and early warning of geological disasters of GNSS software,this paper introduces the overall design scheme of software,according to the deformation characteristics of vast amounts of data,puts forward the storage form of file and database,convenient data management.The components,functions and implementation methods of software modules are introduced in detail.Based on the measured data,the software algorithm is analyzed and the correctness of the algorithm is verified.