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In marine electromagnetic exploration, the successful application of high frequency acquisition technology and the realization of fast storage mode increased the data storage capacity and accuracy, while at the same time, it also increased the difficulty of data quality verification. In the course of the experiment, the data acquisition of next batch will be prepared through the quick data quality...
A novel pilot signal is proposed for the Doppler shift and the delay estimation in the underwater acoustic multi-path channel. A single-frequency signal and a Chirp signal are sent with a fixed time interval. The energy focusing character is applied to process the single-frequency signal part of the mixed signal for the Doppler shift, while the Chirp-based character of the fractional Fourier transform...
Complexity of underwater channel itself and high investment, high risk of field tests are limitations of underwater acoustic communication technology development. For high efficiency of underwater acoustic communication technology development, HLSP/UWAC (A Hardware-in-Loop Simulation Platform for Underwater Acoustic Communication) is proposed. Using configurable underwater acoustic modem as the core...
Aiming at reducing the system complexity, raising communication rate and supporting CDMA based applications, a direct sequence spread spectrum based underwater acoustic communication system is proposed. BPSK/QPSK modulation is used. A RA coding scheme is adopted to reduce the BER. To reduce the phase-acquisition complexity of receiver, a carrier modulation method which lets spread-spectrum code and...
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