Research On Information Acquisition Technology Of Underwater Profile Buoys

At present,marine economy has become an important part of global economic growth.In order to safeguard the marine rights and interests,safeguard the marine safety and strengthen the development and management of marine resources,various means have been adopted to monitor the environmental parameters of the sea.Underwater profile buoy has become a research hotspot because of its fast,accurate,all-weather,large-scale collection of the information of temperature,salinity,depth of global ocean.In this paper,we focus on the information acquisition technology of the ARGO buoy of underwater profile buoys.The research content is divided into the following aspects:Firstly,the Platform Message Transceiver Radio Frequency Module(PMT)is the platform of the third generation of ARGOS system,which is a major improvement of technology,is studied systematically.The signal system and information transmission format of ARGOS1/2/3 system are analyzed and compared,and the mechanism of data acquisition and transmission are studied based on different transmission modes.Under the condition of disengaging the configuration software,the registration of the data set is realized with the serial port monitor,and the relevant parameter information and operation flow of the PMT are summarized through practice.Secondly,based on the principle and model of single satellite passive frequency measurement,the least squares iterative algorithm is introduced.According to the practical application of the buoy,the extended Kalman filter algorithm and its recursive flow are studied,and the equation of state and the equation of measurement are deduced in detail.The influence of several error sources on positioning accuracy is simulated and analyzed.Thirdly,the capture algorithm of PMT signal is studied,and the acquisition of signal is realized by using FFT frequency domain acquisition algorithm.The carrier tracking loop of the FLL auxiliary PLL is designed to realize the accurate tracking and demodulation of the signal.The accuracy of Doppler frequency measurement is simulated and analyzed for several PLL loop errors.Fourthly,by building a test platform,it is proved that the software receiver has a good ability of capturing and demodulating,which proves that it can complete the digital signal processing flow from capture and trace to decoding,so as to realize high-precision measurement of the signal,and The terminal design of the software receiver is completed.The performance of the extended Kalman filter is verified by STK simulation.This paper studies the information acquisition technology of the third generation of ARGOS,which includes data transmission,acquisition,tracking,demodulation,decoding and buoy location.The third generation of ARGOS has just started in the international arena,and domestic research is in a blank phase.The research results of this subject can make our country obtain the data of ocean observation data of ARGO buoy in the world in the future so as to break the information blockage of developed countries,which provides important technical support and protection for marine research and development of our country,and lays a solid foundation for the building of independent marine monitoring system of our country,makes outstanding contributions for the defense of national interests.