Shipborne GNSS acquisition of sea surface heights in the Baltic Sea

IF 0.9 Q4 REMOTE SENSING
A. Liibusk, Sander Varbla, A. Ellmann, K. Vahter, R. Uiboupin, N. Delpeche-Ellmann
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引用次数: 2

Abstract

Abstract For determining precise sea surface heights, six marine GNSS (global navigation satellite system) survey campaigns were performed in the eastern Baltic Sea in 2021. Four GNSS antennas were installed on the vessel, the coordinates of which were computed relative to GNSS–CORS (continuously operating reference stations). The GNSS–CORS results are compared to the PPP (precise point positioning)-based results. Better accuracy is associated with the GNSS–CORS postprocessed points; however, the PPP approach provided more accurate results for longer than 40 km baselines. For instance, the a priori vertical accuracy of the PPP solution is, on average, 0.050 ± 0.006 m and more stable along the entire vessel’s survey route. Conversely, the accuracy of CORS-based solutions decreases significantly when the distances from the GNSS–CORS exceed 40 km, whereas the standard deviation between the CORS and PPP-based solutions is up to 0.075 m in these sections. Note that in the harbor (about 4 km from the nearest GNSS–CORS), the standard deviation of vertical differences between the two solutions remains between 0.013 and 0.024 m. In addition, the GNSS antennas situated in different positions on the vessel indicated different measurement accuracies. It is suggested for further studies that at least one GNSS antenna should be mounted above the mass center of the vessel to reduce the effects of the dominating pitch motion during the surveys.
波罗的海海面高度的船载GNSS采集
为了精确确定海面高度,2021年在波罗的海东部开展了6次海洋GNSS(全球导航卫星系统)测量活动。船上安装了四个GNSS天线,相对于GNSS - cors(连续运行参考站)计算其坐标。将GNSS-CORS结果与基于PPP(精确点定位)的结果进行比较。GNSS-CORS后处理点精度越高;然而,PPP方法在超过40公里的基线上提供了更准确的结果。例如,PPP解决方案的先验垂直精度平均为0.050±0.006 m,并且在整个船舶测量路线上更加稳定。相反,当与GNSS-CORS的距离超过40 km时,基于CORS的解决方案的精度明显下降,而在这些路段,基于CORS的解决方案与基于ppp的解决方案之间的标准差高达0.075 m。请注意,在港口(距离最近的GNSS-CORS约4公里),两种解决方案的垂直差的标准差保持在0.013 - 0.024 m之间。此外,位于船上不同位置的GNSS天线表示不同的测量精度。建议在船舶质心上方至少安装一根GNSS天线,以减小测量过程中主俯仰运动的影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of Geodetic Science
Journal of Geodetic Science REMOTE SENSING-
CiteScore
1.90
自引率
7.70%
发文量
3
审稿时长
14 weeks
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