邻井定位多频优化过零梯形激励信号源设计

通过分析正弦波、方波和最优化过零方波作为激励信号源的优点和不足,设计了集合这三种激励信号源优点的优化过零梯形波,以满足主动型邻井定位技术的测距范围和精度需要。同时提出了基于优化过零梯形波信号源的多频信号检测算法:首先,把接收端的三频含噪信号进行DFT算法处理,找出三个最大幅值对应的频率,求出对应频率的恢复信号幅值;其次,进行幅值校正得到三个频率原始激励信号的真实幅值;最后,对计算出的每个信号的频率及幅值进行重新构造,得到重构信号。仿真实验表明,优化过零梯形波的基波能量占比接近于正弦波,高于最优化过零方波,便于其扩大测距范围、增加测距精度,而且优化过零梯形波作为激励信号源容易在工程上实现。

Design of Multi-Frequency Optimal Zero-Crossing Trapezoid Wave Excitation Signal Source for Adjacent Wells Location

By analyzing the advantages and disadvantages of the sine wave, square wave and optimal zero-crossing square wave as excitation signal sources, an optimized zero-crossing trapezoidal wave integrating the advantages of these three excitation sources is designed to meet the ranging range and accuracy needs of active adjacent wells positioning technology. In addition, the multi-frequency signal detection algorithm based on this optimized signal source is proposed. Firstly,the three-frequency noisy signal at the receiver is processed by DFT algorithm to find out the frequency corresponding to the three maximum amplitudes and calculate the amplitude of the recovered signal corresponding to the frequency; Then, the true amplitudes of the original excitation signals of three frequencies are obtained by amplitude correction; Finally, the frequency and amplitude of each signal are reconstructed to obtain the reconstructed signal. The simulation results show that the proportion of the fundamental energy of the optimized zero-crossing trapezoidal wave is close to that of the sine wave and higher than that of the optimal zero-crossing square wave, which is convenient to expand the ranging range and increase the ranging accuracy,and this wave is easier to be used as the excitation signal source in the project.