Development Of Underwater Magnetic Target Detection System

The target detection technology based on the magnetic anomaly signal is a new type of magnetic detection technology,which is emerging with the improvement of the measurement accuracy of the magnetic sensor in recent years.It takes the target substance containing magnetic materials for geomagnetic disturbances distribution,resulting in physical phenomena of geomagnetic anomaly distributing as the basis to determine the target information by measuring the distribution of magnetic signal feature extraction of magnetic signal.Underwater magnetic target detection system has a wide range of applications in the field of ocean salvage,acquisition of submarine,ocean exploration and so on.This paper first introduces the origin of the subject,then take the research background,significance,the current research situation and development trend as a starting point,elaborated the research content and the main goals to be reached.Magnetic sensor is the main component of underwater magnetic target detection system,paper classify the sensor and introduce the principle simply.The paper analyzes the composition and correction equation of magnetic signal from the output of underwater detection system of magnetic,which equipped with robots "underwater dragon No.two".The main work of the system includes: system hardware design,implementation of embedded system software,the man-machine interface design and the structural design.Hardware design includes power managment circuit,sensor signal processing,analog to digital conversion circuit,network interface circuit,microcontroller and memory circuit,etc.The embedded system software includes microprocessor resource initialization,system real-time clock implementation,magnetic data acquisition unit software implementation,data storage unit software implementation and network data transmission unit software implementation.The human-computer interaction interface includes debugging mode and data transmission mode.The experiment of underwater magnetic target detection system consists of three parts.The main purpose of the geomagnetic station experiment is to verify the reliability of the magnetic sensor data and the stability of the circuit,and check the effection of the titanium alloy cabin to the magnetic sensor.The main purpose of the Qiandao Lake test is to evaluate the response of the system to the magnetic anomaly.The experiment of the South China Sea is mainly to verify the function and reliability of the magnetic calibration algorithm for the underwater robot.At the experimental data processing stage,the paper introduces the theory of the two step estimation method and the basic particle swarm algorithm,and uses the Matlab language to achieve this two algorithms.Then,the experimental data of the South China Sea is analyzed to verify the correctness of the magnetic composition equation and the two calibration algorithm.At the end,paper put forward the problems existing in the research,which lays the foundation for further research.