Design And Implementation Of Tail Subsystem In Marine Controlled Source Electromagnetic Launch System

The exploration and development of deep-sea resources is currently one of the main directions for the country to vigorously develop the marine industry.Marine controlled source electromagnetic method plays an important role in the exploration of subsea oil,natural gas,combustible ice and other resources.Marine controlled source electromagnetic theory is based on transmitting antenna for carrying out analysis of the ideal state level.However,in marine controlled-source electromagnetic exploration,the height,position and attitude of the transmitting antenna of the electromagnetic transmitting system will be changed by the influence of the seafloor current,topography and ship speed,and the inversion results will have large deviations through the data processing of the electromagnetic response data of the receiving system,which will affect the exploration effect.The tail subsystem is the carrier to monitor the motion state of the transmitting antenna.Therefore,this paper investigates the design and implementation of the tail subsystem of the marine controllable source electromagnetic emission system.This thesis relies on the "13th Five-Year Plan" National Major Project of the Ministry of Science and Technology,"Research and Development of Deep-Water Dual-Vessel Towed Marine Electromagnetic Exploration System",to study the impact of data error caused by the change of height,position and attitude of the transmitting antenna,and the electromagnetic interference radiated by the transmitting antenna,and to develop the tail subsystem for monitoring the motion status of the transmitting antenna in the marine controlled source electromagnetic transmitting system.The hardware design of the subsystem is based on the ARM7 embedded microcontroller,equipped with high-precision altimeter,attitude and orientation module,ultra-short baseline positioning beacon and hydroacoustic communication equipment,and completed the construction of the hardware platform for power management,state acquisition,data return and data storage circuits.On the one hand,the status data of the transmitting antenna is recorded into the storage device along with the time stamp,on the other hand,it is uploaded from underwater to the deck monitoring room through a complete communication link,which facilitates the remote monitoring and control of the underwater transmitting antenna by the upper computer monitoring software.Finally,we conducted indoor tests and marine tests to verify the reliability and stability of the tail marker subsystem,and the state data acquisition function is complete,which provides the data basis and technical support for the subsequent correction of the response data errors caused by the change of the transmitting antenna motion state.