Data Acquire Board Development For Ocean Multiple Cable And Multi-component Electromagnetic Receiver

The receiver will be towed when start a two-ship towed marine electromagnetic exploration,can make exploration efficient and dense,its suitable for detailed survey of seabed oil and gas resources.This dissertation design is based on the requirements of the deep-water double-ship towed marine electromagnetic exploration system,develop low noise,low drift error,large dynamic range and can be used for actual marine exploration,the mainly research is the developed of receiver on hardware and software.This paper according to the requirements of the project contract and combined with the previous technology of marine electromagnetic receiver research,designed master receiver(responsible for power management,command transfer,clock synchronization,and data upload in real time)and slave receiver(Responsible for electromagnetic field data acquisition,storage and transmission),the hardware include data amplifier board,acquire board,power board and data transmission board;design program for ARM?CPLD and MSP430;developed network control program,data acquisition monitoring program and environmental parameter monitoring program based on PC,so user can control the receiver conveniently.Electromagnetic field data,motion sensor data and altitude sensor data can be Stored in receiver and transfer to PC at the same time.Finish a detailed test of performance parameters and technical indicators such as frequency response,noise,dynamic range and so on of the receiver in door,Electromagnetic field data,motion sensor data and altitude sensor data can be Stored in receiver and transfer to PC at the same time.Include in the implementation of low noise and low time drift error technology based on the conventional Ocean electromagnetic observation,made three key observation technology: long-distance data transmission,high-precision vector magnetic measurement technology by towed near ocean bottom and GPS transmission real-time.Receiver intended target:Channels: 6(Ex,Ey,Ez,Hx,Hy,temp);Highest sampling rate: 2400Hz;Noise floor: E:2n V/rt(Hz)@1Hz,H: 400 n V/rt(Hz)@1Hz;Dynamic range: E: 110 d B,H: 126 d B;Data transmission speed: more than ?1MB/s;Attitude drift: less than ±1°;Maximum working depth: 1500m;...