A continuously operating GNSS station within a lake interior is uncommon, but advantageous for testing the GNSS Interferometric Reflectometry (GNSS-IR) technique. In this research, GNSS-IR is used to estimate ten years of lake surface heights for Lake Taupō in New Zealand. This is achieved using data collected from station TGHO, approximately 4 km from the lake’s shoreline. Its reliability is assessed by comparisons with shoreline gauges and satellite radar altimetry lake surface heights. Relative RMS differences between the daily averaged lake gauge and GNSS-IR lake surface heights range from ± 0.027 to ± 0.028 m. Relative RMS differences between the satellite radar altimetry lake surface heights and the GNSS-IR lake surface heights are ± 0.069 m and ± 0.124 m. The results show that the GNSS-IR technique at Lake Taupō can provide reliable lake surface height estimates in a terrestrial reference frame. A new ground-based absolute satellite radar altimetry calibration/validation approach based on GNSS-IR is proposed and discussed.

在湖内连续运行的 GNSS 站并不常见，但有利于测试 GNSS 干涉反射计 (GNSS-IR) 技术。在这项研究中，GNSS-IR 用于估计新西兰陶波湖十年的湖面高度。这是使用从距湖岸线约 4 公里的 TGHO 站收集的数据实现的。它的可靠性是通过与海岸线测量仪和卫星雷达高度测量湖面高度的比较来评估的。每日平均湖面高度与 GNSS-IR 湖面高度之间的相对 RMS 差异范围为 ± 0.027 至 ± 0.028 m。卫星雷达测高湖面高度与GNSS-IR湖面高度之间的相对RMS差异为±0.069 m和±0.124 m。结果表明，陶波湖的 GNSS-IR 技术可以在陆地参考系中提供可靠的湖面高度估计。提出并讨论了一种新的基于GNSS-IR的地基绝对卫星雷达测高校准/验证方法。