m伪随机序列中码元宽度选择及影响因素分析  

Selection and Factors Analysis of the Code Width for m Pseudo-random Binary Sequence

作　　者：王显祥[1] 尤农人 邓居智[1] WANG Xian-xiang;YOU Nong-ren;DENG Ju-zhi(Nuclear Technology Applications Ministry of Education Engineering Research Center,East China University of Technology,Nanchang 330013,China)

机构地区：[1]东华理工大学核技术应用教育部工程研究中心

出　　处：《东华理工大学学报（自然科学版）》2019年第3期253-259,共7页Journal of East China University of Technology(Natural Science)

基　　金：核技术应用教育部工程研究中心开放基金(HJSJYB2016-5);国防科工委科研项目(科工二司[2014]1587号);江西省教育厅科学技术研究项目(GJJ160588)

摘　　要：码元宽度是m伪随机编码的重要参数之一,过宽无法保证高频部分信噪比,过窄则造成发射时间和能量的浪费。为此,本文首先研究了选择合适码元宽度的方法,并在总结相关数值模拟结果的基础上,给出了计算合适码元宽度的经验公式。随后,研究了影响合适码元宽度的因素,通过公式推导及数值模拟,表明均匀半空间下码元宽度应与电阻率成反比,与收发距平方成正比;一维模型中,合适码元宽度仍与电阻率成反比,但不再与收发距平方成正比。In recent years,it is more popular using the pseudo-random binary sequence as the source current in electromagnetic method,because of its anti-noise performance.Code width is an important parameter of m pseudo-random binary sequence,determining the highest frequency of m pseudo-random binary sequence.Research show that code width should be selected appropriate,signal-to-noise of high frequency date is lower if the code width is too wide and it will waste of time and energy if the code wide is too narrow.It is studied for the selection method of the suitable code width by analyzing the frequency or time domain electromagnetic date.It summarize the results of numerical simulation models,and give the relevant empirical formula.Then,the factors are studied that affect the code width selection,and it shows that the code width,in uniform half-space model,should be proportional to the square of the offset and the conductivity.In the 1D model,it is still proportional to conductivity,but is no longer proportional to the square of the offset.

关 键 词：伪随机序列 电磁法 码元宽度 

分 类 号：P631.3[天文地球—地质矿产勘探]