【摘要】 针对传统电法仪在测量电阻率大的地层时存在测量精度低的问题,提出了一种在交流电法仪中应用数字互相关技术降噪的方案。该方案将交流电法仪接收电极上的测量信号和激励源的参考信号进行AD转换后,在DSP处理器中计算测量信号和参考信号的互相关函数,提取测量信号中与参考信号同频率的有用分量,从而可有效滤除信号传输过程中的各种噪声干扰。测试结果表明,采用数字互相关技术处理交流电法仪的微弱测量信号,可提高交流电法仪的测量精度和抗干扰能力。更多还原

【Abstract】 In view of problem of low measurement accuracy when traditional electric equipment measures formation with big resistivity,the paper proposed a scheme of using digital cross-correlation technology to reduce noise in AC electrical equipment.The scheme makes AD conversion for measuring signal of receiving electrode of AC electrical equipment and reference signal of exciting source,and calculates cross-correlation function of the measuring signal and the reference signal in DSP processor to extract useful components in the measuring signal which has the same frequency with reference signal,so as to effectively filter various noises in signal transmission process.Test result shows that using digital cross-correlation technology to process weak measuring signal of AC electrical equipment can improve measuring precision and anti-interference ability of AC electrical equipment.更多还原