Quality Management Control Of Highway Surveying And Mapping Project

The establishment and maintenance of geo reference framework is a process of continuous development and renewal.It can provide necessary benchmarks for surveying and mapping construction and engineering construction,as well as benchmark information for geophysical,meteorological and global change research.However,the distribution of global stations is not uniform,and the number of stations is limited,which can not meet the needs of countries for the earth reference framework.It is urgent for countries to establish and maintain the regional reference framework to achieve the encryption of the earth reference framework.With the wide application of Beidou satellite navigation system,it has a broad application prospect and important practical significance to further establish regional benchmark based on Beidou satellite navigation system.Based on the data of GP/BDS continuous operation base station in mainland China,this paper studies the method of BDS based regional base establishment.The main research contents and results are as follows:(1)This paper summarizes the research progress of Beidou satellite navigation system,international earth reference framework and regional earth reference framework at home and abroad,introduces the characteristics and performance of Beidou navigation and positioning system,and analyzes the application scenarios of different regional benchmarking methods according to the characteristics of Beidou navigation system.(2)This paper introduces the GNSS double difference mathematical model,analyzes the error sources of BDS regional datum established by the double difference model,and selects 40 BDS/GPS continuous operation datum stations in the mainland of China at the same time,analyzes the influence of different BDS precise ephemeris,troposphere parameters and antenna phase center correction on the accuracy of regional datum establishment.(3)The baseline repeatability of BDS was analyzed.Using GPS long-term observation coordinate value as a prior starting point,the accuracy and applicability of constraint adjustment and quasi stable adjustment in regional datum establishment are compared and analyzed,and the millimeter level BDS regional datum establishment is realized.