Debever Claire, Kuperman W A
Marine Physical Laboratory, Scripps Institution of Oceanography, La Jolla, California 90093, USA.
J Acoust Soc Am. 2007 Oct;122(4):1979-86. doi: 10.1121/1.2769830.
Adaptive matched-field processing (MFP) is not only very sensitive to mismatch, but also requires the received sound levels to exceed a threshold signal-to-noise ratio. Furthermore, acoustic sources and interferers have to move slowly enough across resolution cells so that a full rank cross-spectral density matrix can be constructed. Coherent-broadband MFP takes advantage of the temporal complexity of the signal, and therefore offers an additional gain over narrow-band processing by augmenting the dimension of the data space. However, the sensitivity to mismatch is also increased in the process, since a single constraint is usually not enough to achieve robustness and the snapshot requirement becomes even more problematic. The white noise constraint method, typically used for narrow-band processing, is applied to a previously derived broadband processor to enhance its robustness to environmental mismatch and snapshot deficiency. The broadband white noise constraint theory is presented and validated through simulation and experimental data. The dynamic range bias obtained from the snapshot-deficient processing is shown to be consistent with that previously presented in the literature for a single frequency.
自适应匹配场处理（MFP）不仅对失配非常敏感，而且要求接收声级超过阈值信噪比。此外，声源和干扰源必须在分辨率单元上移动得足够慢，以便能够构建满秩互谱密度矩阵。相干宽带MFP利用了信号的时间复杂性，因此通过增加数据空间的维度，相对于窄带处理提供了额外的增益。然而，在此过程中对失配的敏感性也会增加，因为单一约束通常不足以实现鲁棒性，而且快照要求变得更加成问题。通常用于窄带处理的白噪声约束方法被应用于先前推导的宽带处理器，以增强其对环境失配和快照不足的鲁棒性。提出了宽带白噪声约束理论，并通过仿真和实验数据进行了验证。从快照不足处理中获得的动态范围偏差与文献中先前针对单频给出的结果一致。
