基于GNSS浮标数据的PPP和PPK方法解算海面高精度对比分析

Precision comparison and analysis of sea surface height measurement using PPP and PPK methods based on GNSS buoy data

全球导航卫星系统(GNSS)浮标技术的广泛应用为海面高测量提供了一种新的思路和方法。使用直径为2 m的GNSS浮标采集了5 d的GNSS观测数据,通过精密单点定位(PPP)和事后处理动态相对定位(PPK)方法对数据进行解算,得到海面高,并对解算的海面高进行低通滤波,将滤波前后的海面高数据与压力计观测的海面高进行对比分析。结果显示:PPP和PPK方法的解算精度(内符合精度)相当;与压力计的对比结果表明,PPK方法的解算精度略高于PPP方法,其与压力计数据的差值整体上较小,但精度相差不大;在滤波后,PPP和PPK方法的定位精度都得到了提高,滤波处理有助于提高海面高观测精度。

The wide application of global navigation satellite system(GNSS)buoy technology provides a new idea and method for sea surface height measurement.This paper utilized a buoy with a diameter of 2 m to collect GNSS observation data for 5 days and solved the data with precise point positioning(PPP)and post processed kinematic(PPK)methods.The sea surface height was obtained,and low-pass filtering was applied to the calculated sea surface height.The sea surface height data before and after filtering were compared with the sea surface height observed by the pressure gauge.The results show that the solving accuracy(internal coincidence accuracy)of PPP and PPK methods is similar.Comparing the results with the pressure gauge shows that the accuracy of the PPK method is slightly higher than that of the PPP method,the difference between PPK and the pressure gauge data is small on the whole,and the accuracy is not much different.After filtering,the positioning precision of both PPP and PPK methods is improved,and filtering helps improve the observation precision of sea surface height.