Analysis and compensation method for tidal level measurement errors of GNSS offshore platforms based on dynamic attitude modeling

The dynamic tilt of offshore platforms has a certain impact on the tidal level measurement accuracy of the Global Navigation Satellite System (GNSS). To address this issue, this study proposes an evaluation method based on physical simulation and mathematical analysis, which applies to GNSS offshore platforms without inertial measurement units (IMUs). By establishing a simulation model to simulate the platform tilt under different sea conditions and combining the tide level measurement data at different antenna heights, the influence mechanism of attitude changes on measurement accuracy was systematically analyzed. The experimental results show that the measurement error is positively correlated with the antenna height and the intensity of sea conditions. Further quantitative analysis indicates that optimizing the antenna installation height can effectively suppress the measurement deviation caused by attitude.