Analysis of Factors on Down-hole Electromagnetic Wave Wireless Transmission Channel Mathematic Model

摘要

All factors that may influence the channel performance and signal attenuation are identified by analyzing the electromagnetic wave channel mathematic model performance. The curves that depict influence of every parameter on output signals are given so as to validate the proposed mathematic model. It is concluded from the simulation results that 1. When stratum impedance is different, signal attenuates in varying degrees, even if the transmitting equipments are placed in the same depth. 2. Signal attenuation almost does not happen if transmitted signal frequency of driver is from 10Hz to 100Hz, namely, at the frequency bands, the signal can't be distorted. 3. Signal attenuation increased with the augmentation of sending device depth, signal-to-noise ratio is very little, and that is to say, capacity of channel between oil well and ground is very limited.