186 results about "Ship dynamics" patented technology

The invention discloses an automatic identification and monitoring system for ships in sea area of a 110kv submarine cable. The automatic identification and monitoring system for the ships in sea area of the 110kv submarine cable comprises a platform, a support system and six functional modules, wherein the platform is a unified frame structure platform functioning as a unified plug-in type platform, a unified date model, a unified data exchange bus and a unified data interface; the support system is an AIS (Automatic Identification System) ship dynamic sub-system; the six functional modules are an electronic chart display platform module, a data receive and interface module, a submarine cable area alarming module, a history playback module, a thematic element management module and an alarm video linkage module. According to the automatic identification and monitoring system for ships in the sea area of the 110kv submarine cable, on basis of achieving AIS ship monitoring in the operation region of the submarine cable, all-weather automatic and intelligent monitoring and early-warning to the operation region of the submarine cable is achieved by data intelligent analysis and automatic warning functions, so that accidents caused by that ships anchor in the submarine cable region are basically avoided, operation security of the submarine cable is ensured, and power supply quality of the submarine cable is improved.

The invention relates to a multi-model self-adaptive fusion filtering method of a ship dynamic positioning system and belongs to the technical field of ship dynamic positioning. The method includes the steps: (1), building a ship three-degree-of-freedom low-frequency and high-frequency motion model, and acquiring a filter state formula and a measuring formula; (2), utilizing a differential global positioning system and a platform compass to measure position information and a heading angle, and collecting information in real time; (3), utilizing prior information and posterior information to initialize input of a model-based filter; (4), on the basis of a system model, utilizing a strong tracking filter and a Sage-Husa filter for parallel filtering; (5), subjecting the model to probability updating, and utilizing residual covariance output by the filters to calculate model probability matched with the model; (6), according to the model probability, acquiring fusion output of multi-model state estimation, namely ship position and heading information. The multi-model self-adaptive fusion filtering method has the advantages of strong robustness, high accuracy in Sage-Husa filter state estimation, stable system, high positioning accuracy and the like.

The invention provides a method for predicting a ship trajectory. The method at least comprises the steps that current related information of a target ship is obtained from ship actual measurement data,wherein the related information at least comprises ship information,a course angle and an instant navigational speed; a ship position state is predicted through a distributed extend Kalman filter algorithm according to current information of the ship,wherein the prediction processes comprise that a discrete nonlinear system is established to be used for describing a target ship state and sensormeasurement,a variance constraint method is used for determine a Kalman gain matrix of each time node,state estimation and upper-bound matrix of the ship at a current moment are calculated to predictstate estimation and upper-bound matrix of the ship at the next moment,the state estimation and upper bound estimation of the ship are updated according to the state estimation and upper-bound matrixof the ship at the next moment,nonlinear consistency Kalman filtering is carried out by adopting a preset ship dynamic model to obtain ship position information at the next moment after filtering.

The invention discloses a submarine cable surveillance protection system. The submarine cable surveillance protection system comprises a shore-based submarine cable surveillance center, a submarine cable positioning system, a ship monitoring system, a wireless communication system and a submarine cable protection system, wherein the submarine cable positioning system is used for acquiring positioning information of a submarine cable, reporting the positioning information to the shore-based submarine cable surveillance center, and planning a submarine cable protection area through the shore-based submarine cable surveillance center; the ship monitoring system is arranged on sea islands or on shores, and used for acquiring navigation information of a ship and returning the navigation information of the ship to the shore-based submarine cable surveillance center; the wireless communication system is used to establish an interaction communication link between the submarine cable positioning system, ship monitoring system and the submarine cable protection area and the shore-based submarine cable surveillance center; and the submarine cable protection system is used for carrying out corresponding intervention on the ship which is illegally stopped in the submarine cable protection area. The submarine cable surveillance protection system can carry out submarine cable real time positioning, civil ship dynamic monitoring, improper ship stopping early warning, and law enforcement evidence obtaining, so that stable operation of the submarine power cable is ensured.