Marine GPS data quality analysis based on epoch-by-epoch phasedifference and TEQC
As one of the important means of ocean observation,global positioning system (GPS) buoys play an important role in ocean monitoring. This paper used GPS data collected from experimental buoys deployed in the East China Sea area of Lianyungang,Jiangsu Province as an example and adopted data preprocessing software (TEQC) to analyze the quality of GPS buoy data from the perspectives of signal-to-noise ratio,multipath effect,and accuracy factor. The method of epoch-by-epoch phase difference was introduced to analyze the stability and data quality of GPS buoy data. The analysis results show that the signal-to-noise ratios of GPS L1 and L2 observations between 35 and 45 dBHz account for 85.3％ and 92.1％,respectively. Compared with fixed land stations,the noise performance is comparable or even slightly better. The multipath effects of L1 and L2 observations are mostly concentrated in the range of-0.46-0.46 m and-0.35-0.35 m,and compared with fixed land stations,the multipath effects of GPS buoy data are slightly higher. The accuracy factor of GPS buoy data is slightly higher than that of fixed land stations. The results of epoch-by-epoch phase difference analysis show that the stability and quality of GPS buoy data are worse than those of fixed land stations,and the harsh environment of the ocean has a significant impact on GPS data.
data quality of global positioning system in marineepoch-by-epoch phase differencemultipath effectsignal-to-noise ratioaccuracy factor
万方数据
维普
