摘要
近年来,基于伪随机信号系统辨识的电法勘查仪器受到广泛关注.教科书和许多文献都指出,伪随机信号系统辨识的突出优点是通过对伪随机信号观测数据的相关处理(即所谓"相关辨识"),具有很强的抗干扰能力.笔者在研制伪随机信号激电仪的过程中发现,相关辨识的抗干扰性并不理想.本文基于仿真模拟和野外试验结果,讨论了相关辨识的抗干扰性.结论是利用全周期相关函数值计算大地(系统)频率响应的伪随机相关辨识,不具有明显增强的抗干扰性.文章分析了其原因.
In recent years, the instruments for electrical and electromagnetic prospecting using pseudo random signal are attracted a wide spread attention. It is pointed by the textbooks and many literatures, that the outstanding advantage of the system identification by pseudo-random signal is of a strong anti-jamming ability based on the correlated data process i.e. correlation identification. During the manufacture and debugging of our instruments it is found that the anti-interference performance of the correlation identification is undesirability. We’ll discuss the anti-interference performance of the correlation identification based on the analogue simulation and field test data in this article. The conclusion is that the pseudo random correlation identification which use correlation function values in a whole period to calculate the frequency response of the system, do not have markedly enhanced anti-interference ability. The reasons of this phenomenon are analyzed in this article.
作者
罗延钟
陆占国
孙国良
黄伟才
高隆钦
LUO Yan-zhong;LU Zhan-guo;SUN Guo-liang;HUANG Wei-cai;GAO Long-qin(China University of Geosciences,Wuhan 430074,China;Beijing Orangelamp Geophysical Exploration Company Limited,Beijing 102200,China;Beijing University of Aeronautics and Astronautics,Beijing 100083,China)
出处
《地球物理学进展》
CSCD
北大核心
2020年第2期760-766,共7页
Progress in Geophysics
关键词
电法勘查
观测仪器
伪随机信号
系统辨识
相关辨识
Electric and electromagnetic prospecting
Instrument
Pseudo random signal
System identification
Correlation identification
