Quantitative identification of causes of instrumental acoustic signal distortion in Global Navigation Satellite System-Acoustics Combination observations.

Yuto Yoshizumi, Yusuke Yokota, Tadashi Ishikawa, Koya Nagae, Shun-Ichi Watanabe, Yuto Nakamura, Kenji Kouno
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Abstract

The Seafloor Geodetic Observation-Array (SGO-A), operated by the Japan Coast Guard, relies on the Global Navigation Satellite System-Acoustics combination (GNSS-A) technique, which integrates satellite positioning systems and undersea acoustic ranging to determine seafloor crustal deformation at the centimeter level for earthquake disaster prevention. Recently, we found distortion in the SGO-A 10-kHz carrier wave that degraded the accuracy. Carrier wave distortion can cause errors on the scale of several centimeters to twenty centimeters, which greatly impedes centimeter-level observations. This study investigated this carrier wave degradation by an underwater acoustic communication experiment conducted in 2022, using a transducer similar to that used by SGO-A. Also, we reproduced degraded waveforms through a grid search-like method for quantitatively evaluating the extent to which the interior of the equipment contributed to deterioration. Our results underscore the importance of careful consideration in signal processing, as the observed waveform degradation is not solely attributed to hardware structures but also to internal electrical circuits. The findings suggest that conventional signal identification methods may lead to errors, providing motivation for a shift towards experimental and experiential timing-based waveform identification approaches to enhance accuracy in GNSS-A systems.
定量识别全球导航卫星系统-声学组合观测中仪器声学信号失真的原因。
日本海上保安厅运行的海底大地测量观测阵列(SGO-A)依靠全球导航卫星系统-声学组合(GNSS-A)技术,将卫星定位系统和海底声学测距技术相结合,以测定厘米级的海底地壳形变,从而预防地震灾害。最近,我们发现 SGO-A 10 千赫载波失真,降低了精度。载波畸变可造成几厘米到二十厘米的误差,极大地阻碍了厘米级观测。本研究通过 2022 年进行的水下声学通信实验,使用与 SGO-A 使用的传感器类似的传感器,对载波衰减进行了调查。此外,我们还通过类似网格搜索的方法重现了衰减的波形,以定量评估设备内部对衰减的影响程度。我们的结果强调了在信号处理过程中仔细考虑的重要性,因为观察到的波形劣化并不完全归因于硬件结构,还与内部电路有关。研究结果表明,传统的信号识别方法可能会导致误差,这就促使我们转向以实验和经验为基础的定时波形识别方法,以提高全球导航卫星系统-A 系统的精确度。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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