摘要
Abstract
This paper studied calculation methods for low-cost global navigation satellite system(GNSS)buoy data to improve the accuracy of sea surface height extraction.The post-processing kinematic(PPK)method was used to calculate the GNSS buoy data,and a sea surface height extraction method based on singular spectrum analysis(SSA)was proposed,with results compared to those obtained through low-pass filtering.Experimental results show that when the base station is 5 km away,the tropospheric error correlation is strong,and the tropospheric correction effect is not significant.However,when the base station is 25 km away,the accuracy of the tropospheric correction increases by 6.3％.In terms of the selection of the elevation angle,the 20° elevation angle demonstrates the best performance in terms of the improvement in precision between the standard deviation and the average value,and it has a significant advantage over other elevation angles.Further-more,compared to the filtered data,the sea surface height extracted using the SSA method shows a reduction of about 7％in maximum difference with the sea surface height measured by tide gauges,a 17％decrease in average difference,and a 19％reduction in standard deviation.In conclusion,the SSA method demonstrates significant advantages in improving the accu-racy of sea surface height extraction,especially in complex marine environments,where it can effectively enhance the accu-racy of sea surface height extraction.The high-precision calculation method for low-cost GNSS buoys proposed in this paper and the sea surface height extraction method based on SSA provide effective solutions for improving the measurement accu-racy of sea surface height.关键词
全球卫星导航系统浮标/低成本/海面高/奇异谱分析Key words
global navigation satellite system buoy/low cost/sea surface height/singular spectrum analysis分类
测绘与仪器
