Research On Underwater Target Detection Method And Error Analysis Based On Gravity Field

Underwater target detection is an important way for humans to understand and understand the ocean.The accuracy of detection has always been a hot issue.The underwater vehicle is an important tool for target detection,and ensuring the safety of the underwater vehicle itself is a necessary prerequisite for the completion of the mission.Due to changes in geology,limited accuracy of reference maps,and long-standing reference maps,it is one of the reasons that threaten the safety of underwater vehicles due to the lack of understanding of the front environment and the collision with unknown objects.Secondly,because most underwater target detection technologies transmit their own signals during target detection,which will undermine their concealment,a passive underwater-based target detection method based on gravitational field is very meaningful.The underwater target detection method and detection error based on the gravity field have always been the focus of underwater target detection.This paper firstly analyzes the feasibility of the target detection based on the gravity field from the basic principle of the gravity field.Through the simulation data,it is found that the gravity gradient value is directly proportional to the density when only the density is different.Secondly,the gravity gradient data of seawater,rocks,and submarine models obtained from the simulation are plotted.It is analyzed that when the accuracy of the gravity gradient value is 10-5E,the detection range is 1000 m.Therefore,the following text is used to set the route to carry out.Underwater target detection based on gravity field.Then,fusion detection based on gravity and gravity gradient is performed in this paper,and the method is compared with the target detection method using only gravity gradient.The accuracy of detection has always been one of the important evaluation indicators for underwater target detection.Therefore,this paper uses the method of numerical analysis to analyze the detection error,and the error of fusion of gravity and gravity gradient target detection is within 5%.Simulation and verification are carried out.The simulation proves that the effect of fusion of gravity and gravity gradients for underwater target detection is better than that using only the gravity gradient.The error is within the allowable range and underwater target can be detected for underwaterFinally,this paper also proposes a underwater gravity gradient target detection method based on Newton iteration method,which transforms the relative position of target detection into a nonlinear equation set composed of three nonlinear equations in a three-dimensional coordinate system.The simulation experiment results show that the underwater gravity gradient target detection based on Newton iteration method can achieve the underwater target detection better.Compared with other methods,this method can only use the gravity gradiometer to compare the accuracy of the detection with gravity and gravity gradient fusion target detection accuracy of about 1%,and accuracy has been improved.This target detection uses only a gravity gradiometer,which reduces costs compared to target detection based on gravity and gravity gradients.