一种数字检波算法在随钻电阻率测量中的应用

针对井下随钻电阻率测量工作环境恶劣,微弱信号常常难以精确测量和保证稳定的问题,设计一种不同于常规模拟检波的数字检波算法。该算法可克服模拟检波电路的固有电路误差、温度变化等对检测数据的影响,能够精确进行小信号的滤波与检测。为检验其可行性,使用Matlab对算法进行了仿真验证,仿真结果显示,可有效克服不同种类噪声、不同信号相位变化的影响。经过实际应用显示,该算法可明显提高检波精度,保证数据稳定性。

Application of digital demodulation algorithm in resistivity measurement while drilling

This digital demodulation algorithm was designed to solve the problems of resistivity MWD,and to improve the measuring accuracy and stability in the hard environment. The algorithm can overcome the influence of the inherent errors of ana-log demodulation circuits and the temperature change on the test data,and can realize the precise filtering and test of small sig-nals. The feasibility of the algorithm was verified with the simulation software Matlab. The simulation result indicates that the al-gorithm can effectively reduce the effect caused by different noises and signal phase variation. The practical application result shows that the algorithm can obviously enhance the demodulation accuracy of the measuring circuit and ensure the stability of test data.