Centre for Imaging, Department of Informatics, University of Oslo, P.O. Box 1080 Blindern No-0316 Oslo, Norway.
J Acoust Soc Am. 2011 Oct;130(4):2024-34. doi: 10.1121/1.3626526.
The problem of locating point-like targets beyond the classical resolution limit is revisited. Although time-reversal MUltiple SIgnal Classification (MUSIC) is known for its super-resolution ability in localization of point scatterers, in the presence of noise this super-resolution property will easily break down. In this paper a phase-coherent version of time-reversal MUSIC is proposed, which can overcome this fundamental limit. The algorithm has been tested employing synthetic multiple scattering data based on the Foldy-Lax model, as well as experimental ultrasound data acquired in a water tank. Using a limited frequency band, it was demonstrated that the phase-coherent MUSIC algorithm has the potential of giving significantly better resolved scatterer locations than standard time-reversal MUSIC.
超越经典分辨率极限的点状目标定位问题再次被提出。尽管时间反转多重信号分类（MUSIC）在点散射体定位方面具有超分辨率能力，但在存在噪声的情况下，这种超分辨率特性很容易失效。本文提出了一种相位相干的时间反转 MUSIC 算法，它可以克服这一基本限制。该算法已经使用基于 Foldy-Lax 模型的合成多散射数据以及在水箱中采集的实验超声数据进行了测试。利用有限的频带，证明了相位相干 MUSIC 算法在提供明显更好的散射体位置分辨率方面具有潜力，优于标准的时间反转 MUSIC。
