Adaptive riser angle position reference system

Details Adaptive riser angle position reference system Adaptive riser angle position reference system

1980-08-13

1982-09-21

Smith, Jerry

Boots, shoes, and leggings

114144B, 364449, G06F 1520, B63H 1500

Patent

active

043510272

ABSTRACT:
An adaptive riser angle position reference system and method for determining the horizontal position of a marine vessel relative to an underwater wellhead from angular deviations from vertical of a riser between the vessel and the wellhead are disclosed. The system comprises sensors for determining deviation from vertical of the riser at positions proximate the wellhead and the vessel and a compensation filter for adaptively filtering signals indicative of the lower and upper riser angles in accordance with filter coefficients which are determined by riser parameters. The filter coefficients are established by riser parameter identification means which effectively compares riser response, as indicated by the lower and upper riser angles, with the responses of a plurality of riser models, and selects filter coefficients corresponding to the most accurate model.

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Grimble, et al, "The Design of Dynamic Ship Positioning Control Systems Using Extended Kalman Filtering Techniques", IEEE, CH1478-7/79/0000-0488, 1979.

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