Research on multi-user detection and delay estimation technology for underwater acoustic multi-user positioning system in mobile scenes

Zihan Zhou; Youwen Zhang; Shumin Tu; Wei Huang

doi:10.1117/12.3033679

13 June 2024 Research on multi-user detection and delay estimation technology for underwater acoustic multi-user positioning system in mobile scenes

Zihan Zhou, Youwen Zhang, Shumin Tu, Wei Huang

Author Affiliations +

Proceedings Volume 13180, International Conference on Image, Signal Processing, and Pattern Recognition (ISPP 2024); 131805B (2024) https://doi.org/10.1117/12.3033679
Event: International Conference on Image, Signal Processing, and Pattern Recognition (ISPP 2024), 2024, Guangzhou, China

Abstract

Underwater acoustic (UWA) communication (UWAC) and positioning technology plays an important role in the field of underwater resource utilization and development. UWA multi-user detection and positioning technology is the core issue in UWAC and positioning systems. The time-varying ocean environment provides UWA multi-user detection, Doppler estimation and compensation and time delay estimation pose great challenges. First of all, in response to the requirements of multi-user UWAC and positioning technology, this article proposes a multi-user detection and delay estimation scheme based on Direct Sequence Spread Spectrum technology, using a 7th-order sequence as the spread spectrum code; secondly, in order to overcome the Doppler problem caused by high-speed motion, this article proposes a Doppler estimation and compensation technology based on ambiguity functions; then, based on the actual FPGA hardware platform, joint multi-user detection and multi-user detection are implemented. Doppler estimation and compensation and high-precision delay estimation algorithm; finally, the simulation and experiment results show that the solution proposed in this article can realize multi-user detection, Doppler estimation and compensation and high-precision delay estimation under 4-user conditions in real time. The delay estimation accuracy is less than 12us when the signal-to-noise ratio is 3dB, and the multi-user detection probability is greater than 90%.

Citation Download Citation

Zihan Zhou, Youwen Zhang, Shumin Tu, and Wei Huang "Research on multi-user detection and delay estimation technology for underwater acoustic multi-user positioning system in mobile scenes", Proc. SPIE 13180, International Conference on Image, Signal Processing, and Pattern Recognition (ISPP 2024), 131805B (13 June 2024); https://doi.org/10.1117/12.3033679

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KEYWORDS

Doppler effect

Signal to noise ratio

Detection and tracking algorithms

Signal detection

Tunable filters

Education and training

Acoustics

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