Dynamic positioning of marine vessels

Details Dynamic positioning of marine vessels Dynamic positioning of marine vessels

2007-02-26

2010-02-16

Pihulic, Dan (Department: 3662)

Communications, electrical: acoustic wave systems and devices

Distance or direction finding

With electromagnetic wave

Reexamination Certificate

active

07663976

ABSTRACT:
Dynamic positioning of a vessel10connected to the seafloor14by a riser12utilizes a measurement of riser12bottom angle combined with a measurement of vessel10velocity, optionally obtained from a Doppler log16. These two signals are combined to produce a single position estimate using an algorithm such as a Kalman filter. Using riser bottom angle only would result in an unstable control system, since the bottom angle lags the vessel motion by a considerable amount and the relationship is non-linear. Using the velocity measurement alone would result in a slow drift of position. The combination of the two eliminates the disadvantages of the individual measurements.

REFERENCES:
patent: 4012919 (1977-03-01), Rosa et al.
patent: 4317174 (1982-02-01), Dean
patent: 5978739 (1999-11-01), Stockton
patent: 2007/0233389 (2007-10-01), Stephens
patent: 1508624 (1982-03-01), None
patent: 2083220 (1982-03-01), None
patent: 2435692 (2007-09-01), None
patent: WO81/02442 (1981-09-01), None
Stephens, R. I., Meahan, A. J. and Flint, J. C.: “Using Doppler logs for safer DP”, Nov. 2005, pp. 1-9.
UK Patent Office Search Report for GB Application No. 0604205.5, date of search Jun. 27, 2006 (1 page).

Affiliated with

Also associated with

Rating

Dynamic positioning of marine vessels does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Dynamic positioning of marine vessels, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dynamic positioning of marine vessels will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4182836