1/6/2024 0 Comments Ortelius ship aisThe MIL-STD-1553 bus is a standard data bus, mostly use in spacecraft on-board data handling subsystem in the military. For the purpose of interfacing low-speed peripheral device on FPGA, I2C bus which is a multi-master, the two-wire bi-directional serial bus is used. The functional simulation of the bus is also carried under different test cases. The paper presents the design and implementation of I2C and MIL-STD-1553 bus protocol, which interfaces FPGA board and on board computers in satellite and synthesized on Virtex-5 FPGA in Xilinx ISE 14.2 platform. Transmission of information requires various interfaces. Satellites that are fitted with S-AIS receivers, receives the information and transmits it to the on-board computers. Vessels equipped with AIS provide vessel navigation information like their speed, location etc. The AIS is used to detect a collision of ships. This paper concentrates on the Automatic Identification System (AIS receiver) and various interfaces on FPGA which is used in the satellite. Results show a high level of correspondence between the data that is robust to dense shipping or high traffic, and the confidence in the data association is improved when using class (i.e., ship type) information. Two case studies in the UK are used to evaluate the performance of the classification-aided data association technique based on the types of SAR product used for maritime surveillance: wide-area and large-scale data association in the English Channel and focused data association in the Solent. These predictions are subsequently used in the data association which uses a rank-ordered assignment technique to provide a robust match between the data. Specifically, a ship classification model is first trained on AIS data and then transferred to make predictions on SAR ship detections. Therefore, a classification-aided data association technique is proposed which uses a transfer learning method to classify ship types in SAR imagery. This often results in an erroneous and/or inaccurate maritime picture. The data association is particularly difficult in dense shipping environments, where ships detected in SAR imagery can be wrongly associated with AIS observations. An important requirement of SAR and AIS data fusion is accurate data association (or correlation), which is the process of linking SAR ship detections and AIS observations considered to be of a common origin. A wide range of research activities exploit spaceborne Synthetic Aperture Radar (SAR) and Automatic Identification System (AIS) for applications that contribute to maritime safety and security.
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