Technology And Realization On Multiple Sensors Data Acquisiton And Transmission Controlling For Marine Seismic Streamer System

In the next20years, China will usher in an important opportunity for both oiland gas. With the increasingly severe shortage of land resources, population growth,environmental degradation and other issues, a "blue revolution" is rising worldwidewith a symbol of marine resources development. This essay was in part by the ChinaTianjin Science and Technology and the China Tianjin Science and Technology SeaProject, aiming to develop a multiple array piezoelectric detection streamer andrelated equipment with intellectual property rights. After designed and derived themodule of the structure of marine seismic streamer system, the software and hardwareof the system was designed and debugged. Finally, the initial system prototype jointdebugging experiments were completed. The Main work was shown as follows:1、Based on the characteristics of marine seismic streamer system, this essayemphatically analyzed every module of the system. Meanwhile, the topologicalstructure and the transmission mode of the system were optimized and improved.Command signal and synchronous signal would be transmitted at the same time. Thesynchronous signal was extracted from command signal and calibrated at the fixedtime, in order to avoid the accumulation of synchronization error, improve thesynchronization signal accuracy and decrease the volume of the system.2、This essay analyzed a variety of transmission technology, designed an arraysignal data transmission technology with adjustable transmission rate, far transmissiondistance, small volume and high reliability. The clock data recovery chip, the drive,the equalizer and the network transformer realized the real-time adjustable rate anddistance reliable transmission.3、The transmission system logic was designed according to the systemhardware circuit. In order to eliminate the lowest rate limitation, the workprogrammed serial-parallel and parallel-serial conversion to take the place of chipwhich had the same function. Simultaneously, this essay designed data transmissionbyte alignment method and programmed I2C bus to control peripherals.4、This essay proposed a high-precision synchronous method, which is suitablefor the structural characteristics of the hydrophone array and used to handle theacquisition synchronization problems among multiple sensors in the hydrophone array. A two-stage synchronization method was adopted to ensure that the acquisition wassynchronous in the same digital package and between different digital packages.5、The work builded a system prototype testing platform. Experimental tests hadbeen completed in two aspects, including board-level hardware testing and systemlevel testing. The test results verified the feasibility and reliability of the systemdesign, which had basically reached the requirements of marine seismic explorationsystem.