Research On Sea Surface Target Positioning Technology Basing On Infrared Images

The rapid development of economy in our country has made maritime trade activities more frequent and more maritime accidents ensued.In the event of a major accident,the rescue and salvage department needs to know the exact location of the accident quickly and accurately to facilitate maritime search and rescue.Therefore,it is of great significance to study the location of sea targets based on infrared images in order to improve the level of search and rescue in our country.This topic comes from the national science and technology support plan "The Airborne Infrared Search and Location Technology for Distressed Targets on Open Sea Surface." The main task of the entire task is to develop a set of underwater distress target airborne infrared search system.As an important part of the project,this project is mainly responsible for the research of sea surface target positioning technology based on infrared images.After the infrared imaging system captures the sea scene image and identifies the distress target by the target detection algorithm,the coordinates of the distress target in the WGS-84 coordinate system are solved by using the positioning algorithm model established in this paper,which is convenient for subsequent rescue and salvage operations.According to the specific requirements of the subject,under the premise of knowing the pixel coordinates of the target image,the seven types of coordinate systems are defined and the conversion relations between different coordinate systems are studied.Combining with the internal parameters of the infrared detection system such as focal length and pixel size,directional angle and other external parameters and the search system position,attitude and other parameters to establish the target location model.Positioning system as part of the infrared search system,the hardware components include infrared acquisition system with image acquisition system,with two-dimensional attitude acquisition camera photoelectric pod stable platform and infrared search system position and attitude acquisition inertial navigation equipment.This paper designs ground experiments and flight experiments to finish target location.The ground experiment refers to the search system fixedly placed somewhere,shooting different locations on the sea surface.Flight experiment refers to the infrared search system is mounted on the aircraft,so that the aircraft in the air in different positions and attitude of the same target on the sea shooting.Through the sea experiment,the system's positioning accuracy and error analysis are obtained.