THE APPLICATION OF DIGITAL TRANSMISSION TO AIRBORNE ELECTROMAGNETIC SYSTEM
ZHOU Xi-hua1,2, XIONG Sheng-qing2, ZHANG Hong3, JIN Long-zhe2
1. China University of Geosciences, Beijing 100083, China;
2. China Aero Geophysical Survey and Remote Sensing Center for Land and Resources, Beijing 100083, China;
3. Beijing Information Technology Institute, Beijing 100085, China
This paper has briefly discussed working principles of the electromagnetic system, the digital transmitter and the multi-frequency digital transmitting technology, and also dealt with the application of digital transmission to the electromagnetic system. The technical performance and survey capability of the electromanetic system have been greatly improved by introducing the up-to-date digital transmitting technology, which reduces the weight of the system, increases the flexibility and lowers the system drift and noise level.
[1] Smith K Mark,Lai Zheren,et al. A New PWM Controller with One-Cycle Response[J].IEEE transaction on Power Electronics,1999,14(1).
[2] Sayed-Amr El-Hamamsy. Design of High-Efficiency RF Class-D Power Amplifier[J].IEEE transaction on power electronics,1994,9(3).
[3] Won J,Oren A, Funak F.A programmable broadband helicopter-towed electro-magnetic sensor[J].Geophysics,2003,68(6).
[4] Larry.IMPULSE Helicopter Electro-Magnetic Survey System.IMPULSE Manual,2003.
[5] Won I J,Keiswetter D A,Fields G,et al. GEM-2: A new multi-frequency electromagnetic sensor[J].J Environ Engin Geophys,1996(1):129.
[6] Franc Cermelj.Design of a class D-Amplifier,a thesis submitted in partial fulfillment of the requirements for the degree of bachelor of engineering in electrical engineering at the University of Newcastle.Australia,University of Newcastle.
[7] 郭良德.西方国家航空物探技术的若干进展[J].物探与化探, 2000, 24(5):341.
[8] 张洪瑞,范正国.2000年来西方国家航空物探技术的若干进展[J].物探与化探, 2007, 31(1):1.
[9] 赵凯华,陈熙谋.电磁学[M].北京:人民教育出版社,1978.