基于数字均衡技术的测井信号解码系统

Production Logging Decoding System Based on Digital Equalization Technology

针对传统测井信号解码系统的硬件电路结构复杂且不易调整的不足,提出一种基于数字均衡技术的测井信号解码系统。系统采用高速AD对测井信号进行采集,采用FPGA对AD采集后的信号进行FIR低通滤波、数字微分以及数字均衡滤波处理;数字均衡滤波器的输入系数由系统根据训练序列的特性学习获得。FPGA对AD采集数据进行幅度判断,根据测井信号大小自动调整电路增益,增强系统的电缆适应性。实际应用效果表明采用数字均衡设计极大程度降低硬件均衡电路的复杂性,并能根据训练序列自主获得均衡系数,提高解码系统的电缆适应性及测井信号传输的可靠性。

A logging signal decoding system based on digital equalization is proposed to reduce the complexity and difficulty in structure adjustment of the hardware of the traditional logging signal decoding system.The system uses high-speed AD to collect logging signals,and FPGA to process the signals by FIR low-pass filtering,digital differentiation and digital equalization filtering.The input coefficient of the digital equalization filter is the result that the system learns from the training series.In addition,the FPGA judges the amplitude of the AD data and automatically adjusts the circuit gain according to logging signals,so as to enhance the cable adaptability of the system.Practical applications show that the digital equalization design can greatly reduce the complexity of the hardware equalization circuit,and can independently obtain the equalization coefficient according to the training series.This can greatly improve the cable adaptability of the decoding system and the reliability of transmitting logging signals.