The Positioning System Design Of Buoy And Short Base Line

More and more attention is paid to the underwater acoustic positioning technology dueto the fast development of Underwater Target Tracking System. The positioning accuracyfor Underwater Acoustic Positioning System needs to be calibrated in order to checkwhether the system accuracy can meet the design demand while the system is accepted. TheBuoy–type Short Baseline Positioning System expounded in this paper is used for precisepositioning through suspending acoustic source at sea and provides the calibration basemark at sea for the calibrated underwater acoustic system. This paper discusses thecombination positioning theory, accuracy simulation, factors influencing on positioningaccuracy, hardware platform design for the Buoy–type Short Baseline Positioning System.At last, the results of the lake experiment and the sea validation experiment for the wholesystem are provided. They demonstrate that the system design is feasible and credible.In order to give the precise coordinates of the suspended acoustic target at sea, theunderwater acoustic positioning system based on the combination of buoy and shortbaseline is designed. The correlative factors influencing the positioning error of thecombined system are studied, such as synchronization error between GPS data and attitudegyro data, sound velocity curve, heading angle measurement error, pitch and roll anglemeasurement error and so on.According to the demand of the combined system, the cRIO processor is utilized,which can process SBL positioning data and GPS and PHINS data and so on. SBL signalprocessing hardware platform is designed. Finally, the operating and controlling softwarefor the combined system is compiled by LabVIEW according to the requirements of thesystem. GPS and attitude gyro data are received in real-time and in synchronism using thetwo serial ports. Combining the positioning for the suspended acoustic source of SBL, thesuspended acoustic target position coordinate is calculated.In the end, the lake validation experiment for the Buoy-type Short Baseline System andthe sea validation experiment are described. The trial result is analyzed. The results showthat the positioning error for the Buoy-type Short Baseline System as a high preciseunderwater acoustic positioning system which gives a base mark at sea meets the accuracyrequirements and can provide high accuracy position standard at sea for the otherunderwater target positioning system.