摘要
基于电磁理论,导出了含介电参数、电导率参数和磁导率参数的导电导磁层状大地务件下的固定翼航空瞬变电磁响应的计算公式.编制了计算机程序,并对理论模型进行正演计算,根据计算结果分析了模型的介电常数、电阻率和磁导率参数、飞行高度参数对响应的影响.理论模型的计算结果显示当其它条件相同时,介质电阻率越小或磁导率越大,则航空电磁响应也越大;而介质的介电参数变化仅影响早期的电磁响应,晚期的响应可以忽略介电因素的影响;对导电性或导磁性强的介质而言,飞行高度变化导致接收信号的相对误差变大.
Based on the electromagnetic theory, the forward formulae is obtained for Fixed-wing Airborne Transient Electromagnetic(ATEM) method in a magnetic conductive layered earth which contains dielectric parameters, conductivity and permeability parameters. The computer program for computing the ATEM response is worked out and the forward computing is completed for the theoretical models. According to the results of forward computing, we analyzed how the dielectric constant, resistivity, susceptibility and flight height influence the electromagnetic response. The results show that (1) Under the same condition, the lower the resistivity of Ihe layered earth lhe greater the early time airborne electromagnetic response; (2)The dielectric parameters affect only the early time electromagnetic response and can be ignored at the late time; (3) The larger the permeability the greater the airborne electromagnetic response, so for the high permeability media, we can not ignore the influence of magnetic; (4)The higher the flight, the weaker the airborne electromagnetic response; The change in flight height will caused the distortion of airborne electromagnetic response, the lower flight height will cause the larger distortion than the higher flight height; For the good conductivity medium or the good permeability medium, the change in flight height will cause the larger relative error in the received signal.
出处
《地球物理学进展》
CSCD
北大核心
2011年第5期1796-1801,共6页
Progress in Geophysics
基金
国家863计划重大项目子课题(2006AA06A206-07):时间域固定翼航空电磁勘查系统研发一二三维正反演方法技术研究资助
关键词
固定翼航空瞬变电磁
电磁响应
层状介质
介电常数
电阻率
磁导率
Fixed-wing Airborne Transient Electromagnetic, electromagnetic response, layered medium, dielectric constant, resistivity, susceptibility