Research On Coding And Decoding Method Based On Phase Tuning Mode

At present,more than 100 sets of BH series manufactured by directional well companies serve domestic and foreign oil fields with drilling instruments.The downhole instrument data transmission rate is 0.5 to 1 BPS,and 0.7 BPS are commonly used.Today,with the general application of drilling instruments,The advantage is no longer obvious.This coding scheme relies on the wide and narrow pulse signals generated by pulse waiting and motion to encode.The main tasks completed in this paper are: completing the research of the phase modulation coding method,completing the research of the phase modulation encoding signal processing technology and decoding technology,completing the research of the directional probe data transmission method and compatibility,completing the study of the adaptability of the pulse device to the phase modulation encoding method,and completing the decoding and exploration.And test software development.In China,the technology for the transmission of drilling fluid information has been in the stage of introduction,use of digestion and imitation.Due to the monopoly of foreign technologies,only the products of negative pulse and positive pulse pressure continuous wave signal generators are available.And the signal transmission rate is far lower than the transmission rate of the continuous wave signal generator.In the world,continuous wave pulse device is widely used to increase the data transmission rate,but the system is complex and the application cost is high,which is not conducive to promoting the application in the low-end market.Therefore,it is necessary to carry out research on coding and decoding methods that can increase the data transmission rate without significantly increasing the manufacturing cost,in order to enhance the competitiveness of the drilling instruments.By using the phase modulation encoding and decoding method in this paper,the existing resources can be fully utilized without increasing the cost,and the MWD Data transfer rate can be effectively improved.