Time-varying Large Doppler estimation compensation technology for underwater acoustic communication

• Long Chen,
• Jiaqing Lai,
• Pengpeng Hu,
• Qin Liang,
• Xianwen Zhao,
• Tingting Wang,

Vol. 19, No. 6, June 30, 2025
10.3837/tiis.2025.06.014, Download Paper (Free):

• Underwater acoustic communication
• spread spectrum
• Doppler estimation compensation
• phase cancellation
• time-varying Doppler

Abstract

In response to the large Doppler effect generated during underwater acoustic communication on rapidly moving ocean platforms, phase rotation phenomenon occurs in signal demodulation, seriously affecting the quality of mobile underwater acoustic communication. The chirp Z-transform-ambiguity function (CZT-AF) code residual phase cancellation Doppler compensation technology is proposed. Firstly, the Doppler is roughly estimated through chirp Z-transform (CZT), and then further fine estimated through ambiguity function (AF) method. Then, the received signal is resampled for Doppler compensation. The CZT-AF Doppler estimation compensation algorithm cannot guarantee complete elimination of Doppler effect and can only lock the Doppler of the signal in a small range, resulting in residual Doppler in the system; Using the idea of residual Doppler phase cancellation, the transmitted signal is first subjected to a complex domain specific transformation to make the signal phase have a certain connection. Through the phase transformation relationship designed for the transmission signal, the corresponding inverse transformation is carried out in the complex domain after demodulation to cancel out the remaining Doppler and achieve complete Doppler compensation. Through simulation analysis, the proposed algorithm has a good compensation effect on small range time-varying Doppler, solving the phase rotation problem caused by Doppler effect during demodulation and ensuring the stability of mobile underwater communication.

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