The Research Of Acoustic Positioning Technology Based On The Long Baseline Positioning System

Acoustic wave is the only information carrier which can propagate longdistances insea water.Acoustic positioning technique plays an important role in marine surveying andcharting.Acoustic positioning technology is an ideal means of underwater targetmeasurement.The main principle of the acoustic positioning system is:Using multiple arrayreceived signal, the acoustic source to receiving point distance is by measured the soundradiation of underwater target from the Launch to the receiver the time throughdelay,solving the positioning Equations The target location information, in order to achievethe target location.The long baseline positioning system has high positioning accuracy andcould positioning a large range.so it is one of the most commonly used positioning systemsin marine surveying and charting.The long baseline positioning system commonly usedGlobal positioning mathematical model,hyperbolic positioning mathematical model.These types of location positioning principle of mathematical models through thecalculation of the acoustic signal propagation time multiplied by the speed of acoustic toget the slant range between the target and hydrophone,and then solving nonlinear equationsto locate the target.Usually the speed of acoustic is get through the experience of acousticvelocity method.The experience of the acoustic velocity method is suitable for little changein acoustic speed profile, the deep ocean or short-range positioning can be ignored of theseabed and sea level on the role of acoustic propagation.This paper researches the simultaneous localization and non-synchronous positioningsystem of the acoustic positioning model.Explores the synchronous and asynchronousacoustic positioning of the solution method,and positioning system’s positioning algorithmin the depth of the unknown and the known circumstances, when to solver Position, as faras possible the elements of the received signal is greater than the target dimension,the extraobservations will be able to improve the positioning accuracy of the model, more accuratethree-dimensional coordinates of the target.Using Monte Carlo method to analysised the positioning accuracy of Synchronous and asynchronous positioning.It has each errorsource and target position on the impact of synchronous and asynchronous positioningsystem’s positioning accuracy.And discussed the feasibility and applicability ofsynchronous and asynchronous positioning. Some useful conclusions are obtained throughsimulation and analysis,when the target in the array, the synchronous and asynchronousalgorithm can achieve high accuracy.compared the synchronous and asynchronouspositioning system,The non-synchronous algorithm does not require emission source andreceiver equipment to precisely,and has the innate superiority to locate targets when it doesnot facilitate the precise time or to facilitate the installation of the cooperative acousticbeacons. Therefore, the scope of its application is broader.