The time arrival structure of acoustic pulse signals propagating in ocean waveguides is of great significance for underwater acoustic communication and navigation. Using the deep-sea sound propagation data from the ex...The time arrival structure of acoustic pulse signals propagating in ocean waveguides is of great significance for underwater acoustic communication and navigation. Using the deep-sea sound propagation data from the experiments respectively conducted in the East Indian Ocean(EIO) and the South China Sea(SCS) with explosion sources near the sound channel axis(SCA), long-range transmission loss(TL) and time arrival structure of acoustic pulses for different sound speed profiles(SSPs) are compared. In the EIO environment, sound energy transmitting along the SCA is relatively large, and the corresponding signals arrive first, whereas signals propagating away from the SCA arrive late. In the full receiving depth, it shows a branch structure where the waveform near the SCA arrives earlier than other depths, which is totally different with the characteristics of the sound pulse in the SCS. Combined with the parametric mathematical model of deep-sea sound channel, the influence mechanism of SSP on the time arrival structure of long-range pulse propagation is theoretically analyzed, which well explains the phenomenon observed in the two experiments.展开更多
In order to acquire hydrologic and acoustic information at the same time,the underwater glider is used as a synchro observing platform and an algorithm of source localization estimation based on the glider in deep wat...In order to acquire hydrologic and acoustic information at the same time,the underwater glider is used as a synchro observing platform and an algorithm of source localization estimation based on the glider in deep water is proposed.The hydrologic and acoustic data acquired by the glider in the Eastern Indian Ocean are used to analyze the self-noise of the glider and the characteristics of acoustics signal propagation.The underwater track of the glider is updated by using underwater dead reckoning.According to the time delay of the received signals,the underwater sound source localization estimation is realized.The results indicate that the self-noise of the glider is quite close to the ambient noise at the no-motor time.The sound transmission losses(TLs)of experiment and simulation are in great agreement.The estimation results of underwater sound source localization are consistent with measurement and the estimation error is less than 5%.The glider loaded with self-contained hydrophones can get hydrologic and acoustic information at the same time,which is important for the acoustic propagation analysis and target localization.展开更多
基金supported by the National Natural Science Foundation of China (11874061,U22A2012)the Youth Innovation Promotion Association of Chinese Academy of Sciences (2021023)。
文摘The time arrival structure of acoustic pulse signals propagating in ocean waveguides is of great significance for underwater acoustic communication and navigation. Using the deep-sea sound propagation data from the experiments respectively conducted in the East Indian Ocean(EIO) and the South China Sea(SCS) with explosion sources near the sound channel axis(SCA), long-range transmission loss(TL) and time arrival structure of acoustic pulses for different sound speed profiles(SSPs) are compared. In the EIO environment, sound energy transmitting along the SCA is relatively large, and the corresponding signals arrive first, whereas signals propagating away from the SCA arrive late. In the full receiving depth, it shows a branch structure where the waveform near the SCA arrives earlier than other depths, which is totally different with the characteristics of the sound pulse in the SCS. Combined with the parametric mathematical model of deep-sea sound channel, the influence mechanism of SSP on the time arrival structure of long-range pulse propagation is theoretically analyzed, which well explains the phenomenon observed in the two experiments.
基金supported by the National Natural Science Foundation of China(11874061,11674349)the Youth Innovation Promotion Association of Chinese Academr of Sciences。
文摘In order to acquire hydrologic and acoustic information at the same time,the underwater glider is used as a synchro observing platform and an algorithm of source localization estimation based on the glider in deep water is proposed.The hydrologic and acoustic data acquired by the glider in the Eastern Indian Ocean are used to analyze the self-noise of the glider and the characteristics of acoustics signal propagation.The underwater track of the glider is updated by using underwater dead reckoning.According to the time delay of the received signals,the underwater sound source localization estimation is realized.The results indicate that the self-noise of the glider is quite close to the ambient noise at the no-motor time.The sound transmission losses(TLs)of experiment and simulation are in great agreement.The estimation results of underwater sound source localization are consistent with measurement and the estimation error is less than 5%.The glider loaded with self-contained hydrophones can get hydrologic and acoustic information at the same time,which is important for the acoustic propagation analysis and target localization.
