Applied Physics Program, University of Michigan, Ann Arbor, Michigan 48109, USA.
Department of Mechanical Engineering, University of Michigan, Ann Arbor, Michigan 48109, USA.
J Acoust Soc Am. 2019 Dec;146(6):4727. doi: 10.1121/1.5138124.
Matched field processing (MFP) refers to a variety of source localization schemes for known complicated environments and involves matching measured and calculated (replica) fields to identify source locations. MFP may fail for several reasons, most notably when the calculated fields are insufficiently accurate. This error commonly prevents MFP-based long-range (>100 km) source localization in the deep ocean (from 5 to 6 km depth) for signal frequencies of hundreds of Hz, even when extensive high-signal-to-noise ratio field measurements are available. Recently, below-band MFP utilizing the frequency-difference autoproduct [Worthmann, Song, and Dowling (2015). J. Acoust. Soc. Am, 138(6), 3549-3562] achieved some shallow-ocean localization success at a 3 km source-to-array range with signal frequencies in the tens of kHz. The performance of this technique, when extended to matching the measured frequency-difference autoproduct with a composite mode-ray replica, is described here for deep ocean source localization. The ocean propagation data come from the PhilSea10 experiment and involve source-to-array ranges from 129 to 379 km and nominal 100-Hz-bandwidth signals having center frequencies from 250 to 275 Hz. Based on an incoherent average of five signal samples, the frequency-difference technique was 90%-100% successful at four different source-to-array ranges using single-digit-Hz difference frequencies.
匹配场处理（MFP）是指针对已知复杂环境的各种源定位方案，涉及到测量和计算（副本）场的匹配，以确定源位置。MFP 可能会因多种原因失败，最常见的原因是计算场不够准确。这种误差通常会阻止 MFP 在深海（从 5 到 6 公里深）中进行基于数百 Hz 信号频率的长距离（>100km）源定位，即使有广泛的高信噪比场测量数据。最近，利用频率差自积的带外 MFP[Worthmann、Song 和 Dowling（2015）。J. Acoust. Soc. Am，138（6），3549-3562]在 3km 的源到阵列距离范围内，在数十 kHz 的信号频率下实现了一些浅海定位成功。当将该技术扩展到测量的频率差自积与复合模态射线副本匹配时，本文将描述其在深海源定位中的性能。海洋传播数据来自 PhilSea10 实验，涉及 129 到 379km 的源到阵列距离和中心频率从 250 到 275Hz 的 100Hz 带宽信号。基于五个信号样本的非相干平均，在四个不同的源到阵列距离使用个位数 Hz 的差频，频率差技术的成功率为 90%-100%。
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