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In the last years considerable emphasis has been placed on safety at sea. There is the maritime security and surveillance system whose main aim is to execute tasks in the interests of maritime safety and to react in case of emergency. They are monitored by networks of radar stations. On such areas we obtain a lot of navigation data which could be used to improve ship’s parameters (position), using know in geodesy modern M-estimation methods. Simultaneous acquisition of navigational information from many independent radar stations will render it possible to obtain a more accurate ship position in marine traffic surveillance systems in relation to the calculated position. A position expected in an adjustment calculus is received from a watch officer. It is burdened with a fallacy of navigation systems and the quality of marking ship’s route on a map. In the case of navigational-parameter measurements used for depicting ship position, one can obtain incorrect results due to a disturbance in the measurement process. In extreme cases, such erroneous data could significantly differ from the anticipated results. Deviating observations could significantly influence the values of measurement results. In order to eliminate the determination of erroneous measurements, one could use resistant estimation methods with suitably selected attenuation functions. The accuracy of a determined position will not be better than the capabilities of the device used. Adjustment gives the possibility of eliminating or minimizing human errors as well as the errors in the indications of navigational devices. This paper presents the latest robust estimation methods using Danish attenuation function for adjustment of navigational observation, using radar observation.

REFERENCES [1] Actions to be taken to prevent acts of piracy and armed robbery, Model course 3.23 (2011 Edition). [2] Best Management Practices for Protection against, Somalia Based Piracy, Version 4, August 2011. [3] Guide to Maritime Security and ISPS Code, IMO, 2012 Edition. [4] International Convention on Standards of Training, Certification and Watchkeeping for Seafarers (STCW) as amended, including the 1995 and 2010 Manila Amendments, IMO, 2011 Edition. [5] Radojević S. M., The case of Somali pirates, ‘Military Work’, 2012, Vol. 64, No. 1. [6] Radojević S

and generic set of such responsibility can be represented by the master’s role. The architecture elaboration process defines the functions to be carried out on board ship under a master’s formal responsibilities and pilot’s responsibilities. Fig. 2. Flow of User Needs excerpted from E-Navigation Architecture Specification Process [own study] Functions carried out on board ship: — Support and Control of Navigation; — Safe Navigation; — Management of Information; — Support Incident and Emergency Management; — Support Maritime Security. Functions