伪随机m序列及其在电法勘探中的应用进展

Review of the pseudo-random m sequence and its application in electrical prospecting of exploration geophysics

m序列是目前应用最为广泛的一种伪随机序列,它最早被用于直接序列扩频系统中,后逐渐被用于数字加密、同步和误码率测量等领域.由于该序列具有类似白噪声良好的自相关特性和频带宽等优点,基于它可以实现高信噪比电法勘探系统,增强系统的抗干扰能力,因此在电法勘探中的应用越来越被重视.本文首先介绍伪随机m序列的本原多项式,软硬件产生方法,及该序列的一些特性.然后系统给出扩频通讯里窄带干扰压制算法,这些算法对地球物理勘探领域的干扰压制算法有借鉴和启迪意义,并提供了在电法勘探中该序列参数选取方法.最后详细阐述了该序列在电法勘探中的发展和研究进展,及每种方法中大地系统冲激响应公式的完整推导,以推进伪随机m序列在电法勘探中的发展.

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 rn 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.