Application Research Of GPS Technology On Modern Highway Survey

These years, with our national economy and the investment in basal establishment construct increasing, the highway has been developed rapidly, and many modern high-grade highways have being built in recent years. The survey of these highways has many characters such as longer line, higher precision, short time and data sharing, .etc. So, we should add more technology content to the survey, design and construction of the highway to improve the modern level of highway's construction.The application of GPS to highway survey is a great technological revolution, and its foreground is very wide. This paper studies mainly using static relative position of GPS to build highly precise three-dimensional control network of highway and using real-time kinematic position of GPS to locate and layout quickly. At the same time, it combines examples of highway survey to analyze and validate. Aiming at the universal problem that GPS net projection distortion goes beyond the limits, this paper brings forward that we should adopt the regional coordinate system based Gauss Projection and Lambert Projection according to tending towards and length. In allusion to the problem that public points are not compatible in GPS net of highway, the paper advances the test method using public points based two-dimensional restrict adjustment. By analysis of the height simulation model of GPS net, the paper brings out dynamic adding power simulation arithmetic to improve precision. The methods of RTK surveying and choosing of regional transform parameters are studied. It puts forward that various methods should be chose neatly in highway projects, and regional transform parameters should be updated dynamically in subsection, and multifarious test methods should be applied synthetically to achieve full-scale quality control of RTK result. Finally, the paper advances concrete scheme about integration of highway survey.