Research On High Precision Personnel Location Method In Ship Cabin Based On UWB

In recent years,with the advancement of ship informatization,the location information service for ship cabin personnel has become a focus of attention.At present,the positioning methods for personnel in ship cabins mostly use positioning technologies such as Bluetooth and RFID,which can no longer meet the needs of intelligent ships in the new situation.Therefore,this thesis combines the specific ship cabin environment and researches the method of locating personnel in ship cabin based on UWB technology to improve the accuracy of cabin personnel location,which is of great significance for the intelligent management of ship personnel location information.Firstly,the positioning principles and characteristics based on UWB technology were studied,and various positioning algorithms of UWB were compared.Considering the size of positioning equipment,construction difficulty,cost,practicability of algorithm,positioning accuracy and other factors,the Two-sided and Two-way ranging algorithm based on time-offlight method is adopted for ranging,and a trilateral positioning algorithm is used to calculate the positioning coordinates.Secondly,combined with the specific cabin environment,the propagation characteristics of UWB signals in the cabin are analyzed,the deployment scheme of the locator is formulated,and a network architecture of the personnel positioning system in the ship environment based on POE power supply and TCP/IP communication is designed and built.According to the ranging algorithm model,the causes of errors in the process of cabin personnel positioning were analyzed.The influence of steel structure cabin on UWB positioning was analyzed through experiments,and the ranging error compensation model based on least square method was established to fit the ranging error.The experimental results show that the ranging error compensation algorithm studied in this thesis can significantly improve the ranging accuracy of UWB,reducing the ranging error by 61.91%.Then,in order to accurately identify the NLOS signal in the UWB positioning process,the NLOS recognition algorithm based on Gaussian mixture model is studied and analyzed,and compared with K-means algorithm to verify the practicability of the algorithm.Using the accuracy rate and recall rate as evaluation indicators,the experimental results show that GMM has a high accuracy rate and can better recognize NLOS signals.Finally,the overall scheme of the ship cabin personnel positioning system is formulated.The hardware terminal of the positioning base station and the positioning tag is designed based on the UWB communication module.The communication protocol between the base station and the tag,as well as the communication protocol between the base station and the gateway,is designed according to the ranging algorithm.By constructing an experimental site in the ship’s cabin,the overall function of the system is tested,and positioning data under different cabin environments is collected for experimental analysis.The final results show that the cabin personnel positioning system in this thesis can basically meet the demand for high-precision positioning of personnel.