• 责任者：Ji Yanju (Key Laboratory of Earth Information Detection Instruments ; Ministry of Education ; College of Instrument Science and Electrical Engineering ; Jilin University ; Changchun 130026 ; China) ; Wang Yuan
• 刊名：Chinese Journal of Geophysics
• 出版年：2013
• 卷期：56(11)
• 关键词：航空电磁法 ; aero-electromagnetic methods
• 页码：p.3640-3650
• 图表：15 illus., 21 refs.
• 分类号：1600
• issnNo：ISSN0001-5733
• isbnNo：CN11-2074/P

     The time-domain semi-airborne electromagnetic system mounted on an airship has outstanding efficiency,low costs and high depth of exploration.Using a 2D FDTD method,this study analyzes the characteristics and variation rules of grounded long wire source airborne electromagnetic responses,and the effect of flight altitude.A receiver is developed on an unmanned airship,using a 32bit MCU with the Cortex-M3 processor,reducing electromagnetic noise by placing a fully differential amplifier in the front of the analog circuit,and recording multi-channel signals synchronously with 24-bit resolution.To achieve ground remote control,we establish a high-speed communication network through WiFi-Mesh connection based on multihop topology.To reduce noise,a method based on ICA is used according to the characteristics of the engine noise analysis.We have carried out two survey tests in a region of Nantong and a pastoral area in Inner Mongolia using the developed receiver on the unmanned airship,and compared the exploration results using the grounded long wire source airborne electromagnetic system,TEM,and MT system.The results indicate that the grounded long wire source airborne electromagnetic method is practical and effective.With the successful flight tests of the developed system,it can be used as a new approach for investigations in deserts,costal beaches,swamps and mountains.