Review of the pseudo-random m sequence and its application in electrical prospecting of exploration geophysics
Chun Shao-hen · Progress in geophysics · 2014
M sequence is the most widely used pseudo random sequence at present.It was first used in the direct sequence spread spectrum system.Then it gradually used in digital encryption,synchronization and bit error rate measurement,etc.Pseudo random m sequence is very similar with white noise in self-correlative characteristic and the bandwidth of the sequence is very wide.Because using the sequence can highly improve signal-to-noise ratio in electrical prospecting system,and enhance the system's anti-interference ability,its application in electrical prospecting is taken seriously more and more.Firstly this paper introduces the primitive polynomial,software and hardware generation method and some characteristics of pseudo-random m sequence.And then the narrowband interference suppression algorithms are introduce systematically.The algorithms has much reference and enlightenment significance to geophysical field.Then this paper introduces the method of parameter selection for the application of the sequence in electrical prospecting.Finally,we introduce the application of the sequence in the electrical prospecting in detail,the present study situation and the formula of the earth system impulse response in order to promote the application of m pseudo-random sequence in the electrical prospecting.