本文選題：航空頻率域電磁法 + 實(shí)時(shí)�。� 參考：《地球物理學(xué)報(bào)》2016年10期

【摘要】：磁偶極子的航空頻率域電磁法儀器在飛行測(cè)量的過程中由于儀器偏置的存在,且儀器偏置會(huì)隨著外部氣壓、溫度等環(huán)境因素以及收發(fā)線圈晃動(dòng)的影響而呈現(xiàn)非線性變化,使得觀測(cè)數(shù)據(jù)出現(xiàn)誤差,因此需要對(duì)儀器偏置進(jìn)行校正.而傳統(tǒng)的在測(cè)線飛行前后將儀器抬至高空的"零場(chǎng)值"標(biāo)定方法具有成本高、受測(cè)區(qū)環(huán)境影響大以及采用線性插值獲取測(cè)線飛行過程中儀器偏置的精度低等缺點(diǎn).本文根據(jù)儀器偏置與儀器姿態(tài)角變化無關(guān)的特性,通過測(cè)得儀器的姿態(tài)角信息,在滿足重疊偶極子模型的條件下,實(shí)現(xiàn)對(duì)儀器偏置的高精度實(shí)時(shí)校正.模型仿真結(jié)果表明,在30m常規(guī)飛行高度下,該方法實(shí)時(shí)測(cè)得的儀器偏置精度接近于110m高空測(cè)得的精度;校正后儀器偏置的絕對(duì)誤差與理論二次場(chǎng)的比值即相對(duì)誤差小于5%,滿足反演大地電導(dǎo)率的精度要求.該方法不僅減少了飛行的工作量,降低了飛行成本和飛行難度,而且可更加精確地獲得測(cè)線飛行過程中儀器偏置的非線性變化值,提高航測(cè)數(shù)據(jù)的觀測(cè)精度.
[Abstract]:The airborne frequency domain electromagnetic instrument of the magnetic dipole has a nonlinear variation due to the existence of the instrument bias during the flight measurement process, and the instrument bias changes with the influence of the external pressure, temperature and other environmental factors, as well as the sloshing of the transceiver coil. The error of the observed data makes it necessary to correct the bias of the instrument. However, the traditional calibration method of "zero field value" which carries the instrument to the high altitude before and after the flight of the measuring line has the disadvantages of high cost, great influence by the environment of the measuring area and low precision of the instrument bias in the course of the flight by linear interpolation. According to the characteristics that the instrument bias is independent of the change of the instrument attitude angle and the information of the instrument attitude angle is obtained, the high precision real-time correction of the instrument bias is realized under the condition that the overlapping dipole model is satisfied. The model simulation results show that the accuracy of the instrument bias measured in real time by this method is close to that measured at a height of 110 m at a conventional flight altitude of 30 m. The ratio of absolute error of bias to theoretical quadratic field after correction is less than 5, which meets the precision requirement of inversion of earth conductivity. This method not only reduces the flight workload, flight cost and flight difficulty, but also more accurately obtains the nonlinear variation value of the instrument bias during the flight, and improves the observation accuracy of the aerial survey data.
【作者單位】： 中國(guó)科學(xué)院電子學(xué)研究所;中國(guó)科學(xué)院電磁輻射與探測(cè)技術(shù)重點(diǎn)實(shí)驗(yàn)室;中國(guó)科學(xué)院大學(xué);
【基金】：國(guó)家重大科研裝備研制項(xiàng)目“深部資源探測(cè)核心裝備研發(fā)”子項(xiàng)目“航空瞬變電磁勘探儀”(ZDYZ2012-1-03-05)資助
【分類號(hào)】：P631.33

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本文編號(hào)：1977445