Receiver Of Underground Ultra-Low Frequency Wireless Communication

In the course of oil exploitation on a regular basis must be in accordance with underground data (such as the underground pressure, flow, temperature, etc.) and adjust the design development program. Although there are ways to ground some of the parameters measured, calculated by the theory of exploitation of underground layer of the work of the state. However, oil, water, steam mixed complex and unstable situation, it is to predict the outcome with a larger difference between the actual situation. To this end, there is an urgent need to address the deep well pump underground direct measurement data. In this paper, through a wireless data transfer method, to achieve the underground data collection. The main contents are as follows:introduced the current domestic and foreign logging methods used, and to make use of these methods of logging the problems and difficulties, the use of OFDM communication, a new method of measuring the underground data. the use of MATLAB's powerful data-processing capability, OFDM signal through the simulation of 8-order Bessel filter range of signals after the phase characteristics of those changes have taken place, which in theory can be used to verify whether such methods of communication as instruments of communication methods. part of the simulation hardware, programming the use of single-chip discrete send 2Hz～9Hz signal to verify the feasibility of OFDM communications.hardware design, a large number of simulation data and results on the basis of the design of hardware circuits. From the beginning of impedance conversion circuit design. 50Hz to filter out the earth's current, using 2 pairs of 50Hz notch filter T. Expounded in the switched-capacitor filter is not feasible in the subject. Choice of discrete components Bessel low-pass filter design, described in detail different operational amplifiers in the process, and detailed test results on the basis of the final conclusions are given.Practice has proved that the use of OFDM as a method of communication is feasible, notch filter design and the design of the discrete components in the experimental phase of the filter is feasible, a large number of experimental data in order to further the design of the instrument is given a solid foundation.