Multi-feature fusion cognitive underwater acoustic communication space-fast time adaptive processing algorithm

Abstract

The invention discloses a multi-feature fusion cognitive underwater acoustic communication space-fast time adaptive processing algorithm. The algorithm includes the following steps: introducing an interference feature analysis-based interference cognitive function on the basis of a traditional space-fast time adaptive array processing algorithm; calculating the number of interference sources by using an array covariance matrix feature decomposition mode, and estimating the direction of a target user and the direction of interference incoming waves by adopting a MUSIC spatial spectrum analysismode; separating interference signals by using a negentropy maximized Fast-ICA based blind source separation algorithm, analyzing time domain features by using an envelope detection mode, analyzing the time-frequency spectrum by using a short-time Fourier transform mode, and further extracting interference features to identify interference types; and finally, selecting appropriate interference samples to perform space-fast time adaptive cancellation according to the interference types, and further improving the convergence speed of the adaptive algorithm. The beneficial effects are that: the dimensionality reduction processing and cancellation sample selection of the space-fast time adaptive algorithm can be realized, and the fast and reliable convergence of the space-fast time adaptive processing can be guaranteed.

Description

technical field [0001] The invention relates to a space-time adaptive processing algorithm for underwater acoustic communication, in particular to a multi-feature fusion cognitive space-time adaptive processing algorithm for underwater acoustic communication, which belongs to the technical field of underwater acoustic communication anti-jamming. Background technique [0002] Due to the serious attenuation of electromagnetic waves in water and the limited transmission distance, underwater acoustic communication technology has become an important means of ocean development and exploration and submarine communication. Shallow sea acoustic communication is faced with interference from many aspects. The common forms of interference in underwater acoustic communication are mainly noise frequency modulation interference, pulse interference and linear frequency sweep interference. Noise FM interference has the characteristics of wide bandwidth, uniform power spectrum and large inter...

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Problems solved by technology

[0003] Compared with other user interference of target communication, the continuous wave interference caused by route ships and storms, the sound of marine life and the pulse interference caused by human construction in the ocean greatly reduce the performance of the underwater acoustic communication system

Although most of the interference can be effectively suppressed by the space-fast time adaptive processing algorithm, some interference cannot be directly processed by the space-fast time adaptive processing algorithm, such as pulse interference. The convergence of the adaptive algorithm is affected by the location of the pulse interference, and the suppression more difficult

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