The Design And Realization Of Underwater Gravity Real-time Measurement And Processing Platform

Underwater gravity real-time measurement and processing technology is a technology that can measure and process gravity anomaly in real time during carrier navigation underwater,and widely used in geological exploration,auxiliary navigation and other fields.This paper takes underwater gravity measurement as the application background and combines the actual needs of gravity-assisted inertial navigation to design and implement an underwater gravity real-time measurement and processing platform.The main research content and results of the paper are as follows:The design goals of the platform hardware architecture are analyzed,and the design scheme of the hardware architecture is given.Taking FPGA chip as platform’s data preprocessing and distribution center,OMAP＿L138 chip as platform’s data solving center,ARM chip as auxiliary file system organization and USB driver.The selection scheme of each chip of the platform is determined,and the data transmission method between the chips is designed based on the interface of the chips.The requirements analysis and design scheme of FPGA chip module design are given,and the clock module,data transceiver module,decoding module,data preprocessing module,and timing module of FPGA in the platform are designed,realize the platform’s data real-time receiving and sending,decoding,synchronization,storage and other functions.Data communication channels such as FPGA / DSP and FPGA / ARM are built.The functional verification of key module of the platform’s FPGA is carried out through experiments.The test results show that the functions of each module meet the design requirements.The platform’s OMAP＿L138 chip and ARM chip software designs are completed.On the OMAP＿L138 chip,the online solution of the platform’s original data is realized,and on the ARM chip,the platform data storage function and the data reading function through the USB driver are realized.In order to verify the effectiveness of the underwater gravity real-time measurement and processing platform,the platform was carried on a measuring ship for a long-term test.The test results show that the platform meet the design requirements in terms of function,accuracy,stability and so on.