Geomagnetic noise analysis and suppression from Next Generation Autonomous Systems 2009 Sea trials
Geomagnetic noise analysis and suppression from Next Generation Autonomous Systems 2009 Sea trials
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DOI：
10.1109/oceans.2010.5664294
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发表时间：
2010-12
期刊：
影响因子：
--
通讯作者：
M. Hughes;M. Tomic
中科院分区：
文献类型：
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作者：
M. Hughes;M. Tomic
由世界各地海军团体推动的一个突出研究领域涉及无线、声学连接、全场磁传感器的进步。2009年，进行了下一代自主系统（NGAS）海上试验，测试了此类传感器的能力。在这次试验中，环境地磁噪声被记录下来，以便更好地理解这些磁传感系统引起的噪声。本文给出了对NGAS噪声数据集的分析结果。提出了四类磁噪声，包括声调制解调器诱导噪声、时钟漂移诱导噪声、地磁背景波动和地磁超低频脉冲。提出了一种消除时钟漂移引起的噪声的鲁棒方法，其噪声抑制效果提高了20 dB以上。给出了地磁背景波动的统计性质和日变化性质。有趣的是，每小时的噪音差异被发现在每天凌晨1点左右达到最小，比一天中的其他时间低15分贝。此外，还介绍了两种噪声抑制技术的应用结果。最后，讨论了超短波脉冲对单传感器探测系统的影响。
A prominent area of research promoted by naval groups throughout the world involves the advancement of wireless, acoustically-linked, total-field magnetic sensors. In 2009, a Next Generation Autonomous Systems (NGAS) sea trial took place which tested the capabilites of a field of such sensors. During this trial, ambient geomagnetic noise was recorded in an effort to provide an improved understanding of the noise induced on these magnetic sensing systems. Results from the analysis of the NGAS noise data set are presented in this paper. Four categories of magnetic noise are presented including: acoustic-modem induced noise, clock-drift induced noise, geomagnetic background fluctuations, and geomagnetic ULF pulsations. A robust method for eliminating clock-drift induced noise is presented, which yields over 20 dB improvement in noise suppression. The statistical and diurnal properties of the geomagnetic background fluctuations are shown. Interestingly, the hourly noise variance was found to reach minimums at around 1 AM UTC each day that were 15 dB lower than the rest of the day. Additionally, the results of applying two noise-suppression techniques are presented. Finally, the effects of ULF pulsations on a single-sensor detection system are discussed.