摘要
针对瞬变电磁信号具有早期衰减快、幅度大,中、晚期信号衰减慢、幅度小的特点。提出了基于DSP的瞬变电磁接收机的设计方案,解决了资源开采时因存在强电磁干扰而使进一步勘探停止的问题。为了检测接收机性能,对其噪声水平及瞬变电磁信号的采集能力进行测试,并通过模型实验证明了瞬变电磁接收机接收电磁信号的动态范围大于138dB,相当于接收机具有24位A/D的分辨率,满足地质探测的要求。此接收机系统具有高密度、高分辨率、大动态范围的快速采样能力。
As to transient electro-magnetic signal with characters of a large amplitude at early stage high-speed decaying and a small amplitude at midterm or later period slow-speed decaying, we present one design based on transient electromagnetic receiver based on DSP, which settled the problem that when exploration is disturbed with strong electromagnetism the further detection is stopped. The testing of receptivity is kept through the testing of noise level and receptivity of transient lector-magnetic signal. Dynamic range of receptivity to transient electro-magnetic receiver is greater than 138DB,which is equal to receiver owning distinguishability of 24 bits, so it is satisfied with demanding of earth-probing radar through testing of model. This receiving system has characters of high density, high distinguishability and large dynamic range.
出处
《长春理工大学学报（自然科学版）》
2008年第1期27-30,共4页
Journal of Changchun University of Science and Technology(Natural Science Edition)
关键词
采集单元
通信单元
同步单元
动态范围
Data acquisition unit
communication unit
simultaneous unit
dynamic range
