摘要
测井技术的成像化和组合化发展使得井下仪器上传的数据量越来越大,需要开发高效率的通信系统以解决数控测井中的通信瓶颈。提出了一种基于正交频分复用OFDM(Orthogonal Frequency Division Multiplexing)的单芯测井电缆调制解调系统方案,并完成了实现此方案的软硬件系统设计。此外,在MATLAB中进行了系统级仿真,模拟了调制解调系统的实现过程和所需的数字信号处理方法,仿真结果表明设计正确、可行。设计中采用了调制解调技术OFDM,使单芯电缆测井系统的数传速率从原来多用的22.8 kbit/s提高到102.4 kbit/s,满足了成像测井及组合测井对单芯电缆测井系统的数据传速率要求。
In exploitation of oil and natural gas, the amount of datum uploaded from downhole logging tools will be larger and larger with the logging technology transformed into imaging and resultant. So it is essential to develop high efficiency communication system to solve the bottle- neck problem of NC logging technology. For this purpose, proposed is one OFDM-based modulation ＆ demodulation system scheme for single-core logging cable, and completed is the hardware and software system design to fulfil the scheme. Then carried out is the system-level simulation in MATLAB to simulate the realization process of the system and the methods of digital signal processing. The simulation result demonstrates that the design is correct and feasible. Due to the use of advanced modulation and demodulation techniques of OFDM, the data transmission rate is improved from 22. 8kbit/s to 102.4kbit/s. This transmission rate meets the request of the imaging logging and resultant logging for single-core cable logging system.
出处
《测井技术》
CAS
CSCD
2008年第6期589-593,共5页
Well Logging Technology
基金
国家自然科学基金项目(50674036)
