Offshore towed-streamer positioning based on variance component estimation

Marine Compass Data Quality Control Method Based on Robust Surface Fitting

“…Arc models require smooth connections between end nodes of various arc segments and rely heavily on discretization, making them susceptible to the influence of compass observations and error accumulation effects. Polynomial models are currently the most widely studied positioning models, comprising polynomial models based on streamer offsets and tangential azimuth angles [9], and has gradually developed into a polynomial curve fitting with rigorous theory, high computational efficiency, and has the ability to make full use of observation data model [23].…”

“…As shown in figure 2, considering the mileage of each sensor on the towed streamer from the starting point as the independent variable and the sensor's coordinates as the dependent variable, a polynomial function relationship between the two can be established, with the model's parameters being the coefficients of the polynomial curve [23]. By utilizing approximate parameters obtained through preprocessing, observation error equations can be estimated, followed by the creation of virtual observation error equations, ultimately leading to the estimated values.…”

Determination of Anchor Drop Sequence during Vessel Anchoring Operations Based on Expert Knowledge Base and Hydrometeorological Conditions

“…With advances in technology, the maritime industry has seen an increased demand for specialized vessels capable of holding a designated position for extended periods of time. Such vessels can perform a variety of functions, including oil exploration [1,2], performing salvage operations, laying pipelines [3,4], conducting seismic surveys [5] or operating wind farms [6]. In many applications, for example in ROVs [7], the preferred positioning system is dynamic positioning, using a set of thrusters to maintain the vessel's position.…”