本文選題：編碼源電磁法 + 相關(guān)辨識(shí)��； 參考：《地球物理學(xué)進(jìn)展》2017年03期

【摘要】：與常規(guī)互相關(guān)法辨識(shí)系統(tǒng)脈沖響應(yīng)的方法不同,本文提出了一種直接由循環(huán)互相關(guān)法辨識(shí)系統(tǒng)頻率特性的方法,用于地球物理譜激電法勘探.具體方法是:采用編碼源信號(hào)為激勵(lì)波形,運(yùn)用循環(huán)互相關(guān)法可恢復(fù)出系統(tǒng)的頻率響應(yīng).仿真計(jì)算結(jié)果表明:本方法在強(qiáng)干擾條件下可高精度辨識(shí)出待辨識(shí)系統(tǒng)的頻率響應(yīng),較高的采樣率和疊加次數(shù)可有效提高測(cè)量精度.野外譜激電法實(shí)驗(yàn)中,采用編碼源激發(fā),中間梯度裝置,最大供電極距5200 m,接收電極距20 m,陣列式同步采集,供電電流8 A條件下,在強(qiáng)干擾工作區(qū)獲得了可靠的視電阻率、相對(duì)相位和金屬因素剖面異常.通過實(shí)測(cè)數(shù)據(jù)分析:該方法有助于提高系統(tǒng)頻率響應(yīng)的辨識(shí)精度,且有很高的頻率分辨率;增加采樣周期數(shù)是在強(qiáng)干擾區(qū)獲得高質(zhì)量數(shù)據(jù)的有效途徑.
[Abstract]:Different from the conventional cross-correlation method, this paper presents a method to identify the frequency characteristics of the system directly by the cyclic cross-correlation method, which is used for geophysical spectral IP exploration. The specific method is that the frequency response of the system can be recovered by using the coded source signal as the excitation waveform and the cyclic cross-correlation method. The simulation results show that the method can identify the frequency response of the system with high precision under strong interference, and the high sampling rate and stacking times can effectively improve the measurement accuracy. In the field experiment, the source excitation, the intermediate gradient device, the maximum power supply pole distance of 5200 m, the receiving electrode distance of 20 m, the array synchronous acquisition, the power supply current of 8 A, and the reliable apparent resistivity are obtained under the condition of strong interference working area. The relative phase and metal factor profile are abnormal. Through the analysis of the measured data, the method is helpful to improve the identification accuracy of the system frequency response and has a high frequency resolution, and increasing the number of sampling periods is an effective way to obtain high quality data in the strong interference region.
【作者單位】： 甘肅省有色地質(zhì)調(diào)查院;中國地質(zhì)大學(xué)(北京)信息工程學(xué)院;中南大學(xué)地球科學(xué)與信息物理學(xué)院;
【基金】：相關(guān)辨識(shí)技術(shù)在譜激電中的應(yīng)用研究(41374185)資助
【分類號(hào)】：P631.3
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本文編號(hào)：1908280