摘要
针对川藏铁路、西南山区等高海拔的勘探,急需一套自动采集电磁勘探系统.本文基于伪随机广域电磁法和自动控制技术,攻克了伪随机多频信号发送与接收相结合的自动控制的难题.首先根据2n伪随机序列信号,生成多频波可控信号源,并推导了伪随机多频波信号的自动采集时间节点控制公式;接着设计了一套自动采集参数结构表和通信控制方法,用于实现在不同设备间的参数交互;最后在伪随机广域电磁法装备上编写自动采集控制核心算法,实现了伪随机广域电磁法自动采集系统.结果表明:通过实验测试,自动采集系统可以得到准确的时间域和频域数据,同时工作时间上节省20%,人力资源上可以节省71%.伪随机广域电磁法的自动采集功能实现了非技术人员介入的数据采集,可降低施工成本,提高勘探效率,尤其是在类似于川藏铁路的勘探中,可由登山队员或当地藏民携带仪器进行数据采集.
Abstract
The wide field electromagnetic method(WFEM)has conducted solid theoretical and practical research,but the research on the automation and intelligence of detection equipment is still relatively weak.This paper develops an automatic acquisition system for WFEM.Firstly,the time node control formula for automatic acquisition is derived,and then a set of automatic acquisition parameter structure table and communication control method are designed.Finally,the core algorithm of automatic acquisition and control is realized on the basis of WFEM equipment technology.Experiments show that the WFEM automatic acquisition system can successfully realize automatic acquisition,and the time domain and frequency domain data obtained are in line with expectations.At the same time,it saves 20%in construction time and 71%in human resources.
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