Research And Application Of Phase Characteristics Of Complex Object For Underwater Active Electric-detection System

Underwater active electrical positioning technology is a new type of underwater detection and environmental perception technology.Its discovery is inspired by the weak electric fish active electrical positioning system.The amplitude-frequency characteristics obtained by the underwater active electric field detection system(UAES)can effectively evaluate the material composition,shape,conductivity and other information of the measured object.Traditional UAES often only collects and analyzes amplitude-frequency information.Although it can obtain some valid information,it ignores the equally important phase information.We used single-frequency signals,multi-frequency signals,and constructed bionic sampling signal signals to detect metal assemblies and organisms,respectively.At the same time,we have innovated and upgraded the detection signals and detection devices of the underwater detection system to improve its detection efficiency and detection performance.1.First of all,data collection,through reading a lot of domestic and foreign literature,collect and analyze the research on weak current fish,and the research and development of underwater detection technology.The research focus and application prospects of vulnerable fish are described.Make reasonable assumptions and prospects on the basis of research,and sort out the theoretical development process and experience.On the basis of previous researches,we propose innovative,meaningful and practical research directions and research goals.2.Secondly,the Cole-Cole model with the highest industry recognition and signal reduction is used to simplify the excitation polarization effect,and the theoretical model of the underwater electric field detection system for weak current fish is constructed.Using short-time Fourier transform and spectral analysis,the detection signal is analyzed to obtain its amplitude-frequency characteristics and phase-frequency characteristics,and feature values are extracted.And apply the principle of bionics to construct a bionic bimodal pulse signal with lower power density and more suitable energy distribution as the detection pulse signal.3.Based on the above theoretical analysis,conduct experiments.The following signals are used as the excitation signals of the underwater electric field detection system: 1)sinusoidal single-frequency excitation signal;2)multi-frequency square wave pulse signal;3)triangular wave signal;4)pulse sampling signal constructed using bionics principle.The objects to be tested can be selected from simple to complex: 1)homogeneous bodies of copper and iron with different geometric shapes in the inorganic body;2)homogeneous bodies in the inorganic body and complex inorganic bodies such as ores;3)organic plants Plant tissues such as bananas,potatoes,eggs and fish in the body;4)Aquatic animals with connective tissues and eggs in animal organic tissues.And the result processing and analysis of the collected experimental data.4.Again,through the two phases of absolute phase difference and relative phase difference experimental analysis,summarize the experimental results.Analyze the errors that appear in the experiment,and put forward reasonable assumptions and verifications for the causes.The effects of electrode materials,electrical conductivity,measured object distance and surface materials on the experimental results were qualitatively studied through specific experiments.5.Finally,summarize and summarize the full text,prospect and feasibility analysis of potential applications.