Quality Checking And Analysis On GNSS Data In China Ocean Observing Station

Based on the observational data of China's coastal GNSS operational observing system from 2009 to 2016, this paper analyzes the data quality of China's coastal GNSS observation station on the basis of summarizing the relevant data quality analysis at home and abroad, and discusses the correlation of data quality indicator, analyzes the factors affecting the quality of data. The method of improving the accuracy of data settlement is put forward, which provides effective suggestions for the subsequent operation and maintenance of the system. The main work of this paper is as follows:1.This paper makes a systematic analysis of the data quality of GNSS observation stations along the coast of china. The data quality of continuous observation data is analyzed in three regions according to the latitude, and the influence of regional differences on the quality of data is discussed. The correlation of data quality detection indexes is studied. The data quality of GPS,BDS and GLONASS multi-Situation is compared to provide a reference for the follow-up data solution system;2. The factors affecting the quality of the data are analyzed from three aspects: high-altitude ionospheric environment, ground observation environment and hardware equipment. It is found that the observation environment has little effect on the quality of the data, but the aging of the hardware equipment is the main reason for the poor data quality year by year. The response of the GNSS observation data quality when extreme weather occurs is analyzed, the result shows that the variation of ionospheric delay before and after disaster will often cause a slight fluctuation of data quality, the daily maintenance of the quality of the data and quasi real time monitoring system should be paid attention to;3. The data quality of some coastal GNSS stations and the surrounding IGS tracking stations is compared and analyzed. The results show that the phenomenon that IGS tracking station data quality has become worse is not obvious. The routine maintenance of the tracking station is more scientific and the receiver. The receiver is in constant temperature and humidity environment can effectively delay the aging of hardware devices, which provides effective reference and suggestions for the operation and maintenance of China's coastal GNSS business system;4?The influence of data quality on the results of data analysis is analyzed,and the precision of data calculation is improved by using the method of tick star filtering.