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Sea Current and Wind as Additional Factors in Computing the Fuzzy Ship Domain Minimum Safe Distance
Felipe P. Vista IV,Chang Goo Lee,Hak Tae Kim,Kil To Chong,Kim Young Chul 대한전자공학회 2010 ICEIC:International Conference on Electronics, Inf Vol.1 No.1
Collision alert system aboard ship usually determines if another vessel is inside its fixed minimum safe distance to alert the navigators. Utilizing the existing method of augmenting this fixed minimum safe distance with a minimum fuzzy safe distance is a great way to improve the safety factor. Incorporating the effects of water current and the wind as additional factors in addition to ship size, ship speed and sea state in computing the minimum fuzzy safe distance is proposed. Simulation results show that the proposed additional factors gave satisfactory results.
Vista, Felipe P.,Chong, Kil To Hindawi Limited 2018 Journal of sensors Vol.2018 No.-
<P>This paper describes the design, development, and implementation of a real-time sensor fusion system that utilizes the classification and weighing plus extended Kalman filter algorithm to derive heading for navigation using inexpensive sensors. This algorithm was previously tested only through postprocessing using MATLAB and is now reprogrammed using Qt and deployed on a Linux-based embedded board for real-time operation. Various data from inexpensive sensors such as global positioning system devices, an electronic compass, and an inertial measurement unit were utilized to ultimately derive a more reliable and accurate heading value. The algorithm flow can be described with the GPS values first being evaluated and classified which are then fused with the EC heading using classification and weighing, whose result is then passed through an EKF to fuse with the IMU data. Real-time tests and trials were done to prove the operational capability of the developed process. The complete setup and configuration processes of the systems for development and deployment via Qt are also provided for those interested to replicate the process.</P>
Fusing Multiple Inexpensive GPS Heading Data via Fuzzified Ad-Hoc Weighing
Vista IV, Felipe P.,Lee, Deok Jin,Chong, Kil To Trans Tech Publications, Ltd. 2015 Applied Mechanics and Materials Vol.776 No.-
<P>Applying the same principle behind the Ad-hoc weighing used in fusing data from two inexpensive GPS and an electronic compass (EC) brought up the problem of numerous conditions when trying to fuse data from three GPS devices. Fusing data from two GPS and one EC required at least thirty-two (32) conditions while using three GPS would require 182 conditions that would have entailed a complex set of programming codes. Fuzzy logic was explored as a possible candidate to replace the hard-coding of if-then-statements but still perform the ad-hoc algorithm as desired. The GPS Fix and HDOP (horizontal dilution of precision) values are utilized to derive the corresponding weight to be assigned to the individual GPS as well as the overall fused GPS data. Experimental tests using actual GPS data showed the effectivity of the proposed method.</P>
Marine Tracking System using AIS, GPS, and ENC
Felipe P. Vista IV(비스타네 필립),Beom Seok Park(박범석),Chang Goo Lee(이창구),Yeong Chul Kim(김영철),Kil To Chong(정길도) 대한전기학회 2009 정보 및 제어 심포지엄 논문집 Vol.2009 No.10
For a marine navigator, keeping track of one's location in a specific area especially while on the way, or under way, is very important. Knowing the details of the immediate surrounding area where one is currently located comes as a very close second. Keeping these two important factors in mind, we propose an IT-based system for the marine industry that would keep track of own-ship and other ships in the area while stationary or in the move while at the same time showing the information about the current area from an Electronic Navigation Chart (ENC).