Efficient Underwater Acoustical Localization Method Based On Time Difference and Bearing Measurements

Zhang, Liang; Zhang, Tao; Shin, Hyo‐Sang; Xu, Xiang

doi:10.1109/tim.2020.3045193

Cited by 34 publications

(16 citation statements)

References 30 publications

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“…This paper addresses a VMS localization method, considers 2D bearings-only localization. In the future, the proposed VMS approach will be applied in various localization schemes, such as 3D angle-of-arrival localization [ 41 ], time-of-arrival localization [ 42 , 43 , 44 ], time-difference-of-arrival localization [ 45 , 46 , 47 , 48 ], or doppler-bearings localization [ 49 , 50 ].…”

Section: Discussionmentioning

confidence: 99%

Locating an Underwater Target Using Angle-Only Measurements of Heterogeneous Sonobuoys Sensors with Low Accuracy

Kim

2022

Sensors

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This paper considers locating an underwater target, where many sonobuoys are positioned to measure the bearing of the target’s sound. A sonobuoy has very low bearing accuracy, such as 10 degrees. In practice, we can use multiple heterogeneous sonobuoys, such that the variance of a sensor noise may be different from that of another sensor. In addition, the maximum sensing range of a sensor may be different from that of another sensor. The true target must exist within the sensing range of a sensor if the sensor detects the bearing of the target. In order to estimate the target position based on bearings-only measurements with low accuracy, this paper introduces a novel target localization approach based on multiple Virtual Measurement Sets (VMS). Here, each VMS is derived considering the bearing measurement noise of each sonar sensor. As far as we know, this paper is novel in locating a target’s 2D position based on heterogeneous sonobuoy sensors with low accuracy, considering the maximum sensing range of a sensor. The superiority (considering both time efficiency and location accuracy) of the proposed localization is verified by comparing it with other state-of-the-art localization methods using computer simulations.

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Section: Discussionmentioning

confidence: 99%

Locating an Underwater Target Using Angle-Only Measurements of Heterogeneous Sonobuoys Sensors with Low Accuracy

Kim

2022

Sensors

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“…e time difference method mainly uses the difference of two or several consecutive frames in the digital video sequence to extract the moving target of basketball shooting training [29][30][31]. e basic process of the time difference method is shown in Figure 2.…”

Section: Extracting the Goal Of Basketball Shooting Trainingmentioning

confidence: 99%

Standardized Judgment Method of Shooting Training Action Based on Digital Video Technology

Guo

Hui

2021

Scientific Programming

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Aiming at the difficulty of standardizing the action of basketball shooting training, a new method of standardizing the action of basketball shooting training is proposed based on digital video technology. The digital video signal representation, video sequence coding data structure, and video sequence compression coding method are analyzed, and the pixels of basketball shooting training action position space are sampled to collect basketball shooting training images. The time difference method is used to extract the movement target of basketball shooting training from a digital video sequence. Based on digital video technology, the initial background image is estimated, and the update rate is introduced to update the background estimation image. According to the pixel value sequence of the basketball shooting training image, the pixel model of the basketball shooting training image is defined and modified. By judging whether the defined pixel value matches the background parameter model, the standardization of shooting training can be realized. The experimental results show that the proposed method has good stability, high precision, and short time in determining the standardization of shooting movement, can correct the wrong shooting movement in real time, and can effectively guide basketball shooting training.

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“…Compared with other sonic speed measurement methods, the time difference method has a faster response speed. The sensor using the time difference method is small in size and low in power consumption, hence the time difference method is very suitable for field measurements (Ko et al, 2012;Sun et al, 2020;Liu et al, 2021;Sun et al, 2021;Zhang et al, 2021). Most underwater sound velocity measurement sensors and profilers on the market use the time difference method.…”

Section: Introductionmentioning

confidence: 99%

The design and calibration of a low-cost underwater sound velocity profiler

Zhang

et al. 2022

Front. Mar. Sci.

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The sound velocity profile is the base of various underwater acoustic equipment. In this paper, a low-cost sound velocity profiler is designed based on the time difference method. It mainly includes three parts: the control unit, the storage module and the ultrasonic measurement module. Its overall volume is small, and the standby power consumption is low. It can be integrated into various underwater measurement platforms and profilers to realize the sound velocity measurement, and it also could be used as a self-contained sound velocity sensor. Furthermore, according to the sound velocity measurement principle and response characteristics, a calibration algorithm based on Recurrent Neural Network (RNN) and Discrete Wavelet Transformation (DWT) is proposed, which can improve the accuracy and adapt to the nonlinear response of the system by using multiple sets of time data obtained from the measurements. It is verified by calibration experiments that the neural network calibration algorithm can effectively reduce the nonlinear system error in the measurement, and its effect is better than the traditional linear regression method. The designed system prototype can achieve measurement accuracy of 0.05m/s after calibration, which can meet the needs of low-cost and high-precision underwater sound velocity measurement.

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Efficient Underwater Acoustical Localization Method Based On Time Difference and Bearing Measurements

Cited by 34 publications

References 30 publications

Locating an Underwater Target Using Angle-Only Measurements of Heterogeneous Sonobuoys Sensors with Low Accuracy

Locating an Underwater Target Using Angle-Only Measurements of Heterogeneous Sonobuoys Sensors with Low Accuracy

Standardized Judgment Method of Shooting Training Action Based on Digital Video Technology

The design and calibration of a low-cost underwater sound velocity profiler

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