摘要
本文描述了测井系统中经电缆传送井下数据的一种新的调制技术——四相码调制.该调制技术具有传输效率高、全部用数字电路实现调制解调、工作稳定等优点.与4PSK调制技术相比,它更适合于在测井系统中应用。
A new modulation technique——four phases code modulation (4PCM) in the transmission of logging data is described in this paper. It has the advantages of high transmission effi-ciency, full digitization of modulation and demodulation, and stable operation. Comparedwith 4PSK modulation, this new technique is more suitable for well logging system.
