High resolution line spectrum enhancement method of underwater target based on single vector hydrophone
Weak signal detection has always been a technical challenge for remote detection of passive sonar systems.In order to solve the difficult problem of target line spectrum detection under the condition of weak underwater signal,that is,under the condition of low signal-to-noise ratio (SNR ),based on the single vector hydrophone signal reception,a processing method of combining underwater target acoustic pressure with vibration velocity deconvolution(CPVD)in frequency domain is proposed ,which can achieve line spectrum enhancement and improve frequency domain resolution.Single vector hydrophone is used to ensure the small volume of sonar system.At the same time,its directivity can suppress noise and improve signal gain.On this basis,the CSD algorithm is used to enhance the line spectrum of weak signals in water to achieve effective detection.The proposed method overcomes the shortcomings of some enhancement algorithms and power spectrum analysis algorithms that require some prior knowledge and low frequency domain line spectrum resolution.From the simulation analysis and sea trial data processing results,the proposed underwater target line spectrum enhancement algorithm based on single vector hydrophone has advantages in improving frequency resolution under low SNR,an effective algorithm for line spectrum detection of weak signals is provided in passive sonar systems.
weak signal detectionsingle vector hydrophoneline spectrum enhancement
万方数据
维普
