Volume 39, Number 5, October 2021
|Page(s)||962 - 970|
|Published online||14 December 2021|
Doppler estimation and compensation method for underwater target active detection based on communication signal
School of Marine Science and Technology, Northwestern Polytechnical University, Xi’an 710072, China
The integration of underwater detection and communication uses communication signals to detect a target actively, but the Doppler effect deteriorates the parameter estimation performance of the integrated system. To eliminate the influence of the Doppler effect, a joint Doppler estimation and compensation method based on spectrum zooming and correction is proposed. Firstly, the synchronization signal is used to obtain the signal receiving delay and intercept the single-frequency signal segment in the received signal. Then, the discrete Fourier transform is used to find the frequency that corresponds to the maximum amplitude of the single-frequency signal segment. Finally, the frequency spectrum is refined and corrected within the range near the frequency. The Doppler factor is estimated and the received signal is compensated by the Doppler estimation value. The simulation results show that the proposed method improves Doppler factor estimation accuracy, increases the cross-correlation processing gain and improves DOA (direction of arrival) estimation performance, thus being robust to different Doppler effects.
Key words: Doppler estimation and compensation / integration of underwater detection and communication / communication signal / spectrum zooming / spectrum correction
关键字 : 多普勒估计与补偿 / 探测通信一体化 / 通信信号 / 频谱细化 / 频谱校正
© 2021 Journal of Northwestern Polytechnical University. All rights reserved.
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