Nichols Brendan, Sabra Karim G
Department of Mechanical Engineering, Georgia Institute of Technology, 801 Ferst Drive, Atlanta, Georgia 30332, USA
J Acoust Soc Am. 2015 Sep;138(3):EL329-35. doi: 10.1121/1.4929615.
Autonomous underwater gliders fitted with vector sensors can be used as a spatially distributed sensor array to passively locate underwater sources. However, to date, the positional accuracy required for robust array processing (especially coherent processing) is not achievable using dead-reckoning while the gliders remain submerged. To obtain such accuracy, the gliders can be temporarily surfaced to allow for global positioning system contact, but the acoustically active sea surface introduces locally additional sensor noise. This letter demonstrates that cross-coherent array processing, which inherently mitigates the effects of local noise, outperforms traditional incoherent processing source localization methods for this spatially distributed vector sensor network.
配备矢量传感器的自主水下滑翔器可用作空间分布式传感器阵列，以被动定位水下声源。然而，迄今为止，在滑翔器仍处于水下时，使用航位推算无法实现稳健阵列处理（尤其是相干处理）所需的位置精度。为了获得这种精度，滑翔器可以临时浮出水面以便与全球定位系统接触，但活跃发声的海面会在局部引入额外的传感器噪声。本文表明，交叉相干阵列处理固有地减轻了局部噪声的影响，在这种空间分布式矢量传感器网络中，其性能优于传统的非相干处理源定位方法。
