复杂水下环境中的Dual-HFM速度谱优化

doi:10.12305/j.issn.1001-506X.2023.10.01

Abstract

Abstract:

The dual hyperbolic frequency modulated (Dual-HFM) speed spectrum estimation method pro-vides high-resolution continuous Doppler estimation results under ideal conditions. However, the sidelobe supp-ression caused by the multipath and dual-target environment weakens the ability of the speed spectrum method to suppress noise and affects the target parameter estimation. In this paper, the application of this method in various complex underwater acoustic environments such as multipath and dual-target is discussed in depth, and the position of the speed spectrum sidelobe caused by multipath and dual-target is derived. The speed spectrum sidelobe suppression method based on a multi-frame signal is proposed. It uses the difference between the target echo information and the multipath sidelobe clutter in the signal space of another dimension to suppress the speed spectrum sidelobe in the complex underwater environment, and retains the advantages of low speed spectrum calculation. The applicability of the proposed method is verified by numerical simulation, which provides a theoretical basis for Doppler estimation in low signal-to-noise ratio, multipath and dual-target envi-ronments.

Key words: dual hyperbolic frequency modulation (Dual-HFM), Doppler estimation, multipath effect, multi-frame signal, sidelobe suppression

CLC Number:

TN911.23

Yubin FU, Xiaochuan MA, Xuan LI, Bohao SUN, Xiaoyue CHEN, Xingyuan PEI. Dual-HFM speed spectrum optimization in complex underwater environments[J]. Systems Engineering and Electronics, 2023, 45(10): 2999-3007.

Figures/Tables 13

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编号	路径数量	子、主路径时延差
1	3	0, 1, 3
2	5	0, 1, 3, 5, 7
3	7	0, 1, 3, 5, 7, 9, 11

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Dual-HFM speed spectrum optimization in complex underwater environments

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