The Study of Anti-noise Immunity for Electromagnetic Method Based on m Pseudo-random Sequence

Abstract

Electromagnetic methods play an important role in the exploration of metal ore mineral, oil and gas resources. It is very difficult to obtain a high signal to noise ratio with increasingly electromagnetic noise using conventional anti-noise method. In recent years, the pseudo random sequence attracts a lot of attention because of its anti-noise performance. This paper describes two common methods used to extract the impulse response from the pseudo-random sequence response studies have shown that the two methods are available to get high-precision impulse response without noise.The extraction accuracy of the results using the two methods were compared with date contained in the noise, that shows that the results of method 2 is better than 1, then analyzing the reasons for this situation. Finally, the study is made to improve the ability of the anti-pseudo-random sequence of methods, including to improve the order of the pseudo-random sequence, using a different encoding, change the number of cycles in order to achieve the purpose of noise suppression.