The Three Gorges Ship Lift Navigation Of Ship Dynamic Draft Detection System Research

The key to safe and efficient operation of the three gorges ship lift is navigable depth of into compartments of ship lift ship to draft,but the current domestic and foreign research on ship lift navigation of ship draft detection technology is not mature,can't ship the detection of real-time navigation of the ship draft value.So to develop a set of three gorges ship lift is suitable for the navigation of ship detection system is very necessary for safe and efficient operation of ship lift,meet the three gorges ship lift navigation ships from the ship draft fast detection,speed detection and the ship violation forensics save information needs.Paper on the basis of waterway waters study of ultrasonic propagation characteristics of underwater sound field transmission model.Are proposed according to the ultrasonic propagation characteristics of the ultrasonic wave diffraction theory and the ultrasonic propagation of multiplicity of underwater effect.Also studied the water bubbles and ship speed influence on detection of dynamic to draft.Paper finished the composition of three gorges ship lift navigation of ship dynamic draft detection system and the design of each subsystem.The three gorges ship lift navigation of ship dynamic draft detection system is made up of the draft AIS detection subsystem,ship detection subsystem,the ship speed detection subsystem,information acquisition and processing subsystem and ship illegal evidence information stored query subsystem of five parts.Thesis completed the software and hardware design of ship draft detection subsystem and on-site installation.According to the actual situation of three gorges ship lift,the system hardware design mainly includes the acquisition unit based on FPGA control,based on the STM32 data acquisition unit,water level measuring module and data transmission module;System software design mainly adopts the data parity and CRC cyclic redundancy check algorithm to solve the problem of transport distance data transmission error,the ultrasonic sensor data feature standardized algorithm solve the problem of inconsistent between multi-channel sensor parameters,using coarse value localization algorithm solve the problem of ultrasonic sensor keep out draft detection system number,amplitude subdivision algorithm is used to solve the problem of ultrasonic sensor shade depth draft detection system,using average filtering and median filtering algorithm to solve the problem of random abnormal data,USES the wide choices least-squares linear regression prediction algorithm solve the problem of ship wake noise.Through laboratory experiments and the national unit of measurement certification,ship lift navigation of ship draft detection system under the laboratory environment measuring contrast difference is 0.028 m.Engineering design into the ship lift stable to use a year later,the system of testing result important for measuring contrast difference is 0.056 m.In the system measurement results can be used as a maritime sector as the basis of actual important navigation of ship in real time.