Accurate Measurement Research Of Marine Gravimeter And Development Of Control Platform

Gavity distribution of the earth is the important data information for exploring the structure of the earth and development of aviation and space industries.Three quarters of the earth's surface are covered by Oceans..Marine gravimeter is the key instrument for acquiring gravity of sea areas of the earth surface.Based on the study of GSS-2 marine gravimeter, this paper designed and developed a new measurement and control system for GSS-2 marine gravimeter. Theoretical research and simulation analysis on the method of accurate measurement are also given.Main works of this paper are:1. Focusing on the upgrading of the old measurement and control system, an entirely new system is designed as slave-computer which is based on PLC and electromagnetic relay respectively as core control unit and logic control device.2. A Industrial computer is used as host-computer, and a new host-computer software is designed base on VB6.0.The function of the host-computer software include logic control, database administration, ploting system for gravity value and three axises acceleration, receiving GPS signal, etc.3. This paper gives the transfer function of GSS-2 marine gravity sensor by system identification based on step response method and least square method.Based on the transfer function and the new control system, a colsed loop control ing model is established.4. Based on the closed loop controlling model, this paper presents an improved self-tuning fuzzy PI controller.The simulation experiment proves that the improved self-tuning fuzzy PI controller is better than the PI controller.5. An effective solution for correcting cross-coupling effect of GSS-2 marine gravimeter is proposed based on three axises acceleration.Computing formula and the method of computing the constant coefficient are also proposed in the paper.