Rejection of Direct Blast Interference Based on Signal Phase-Matching Array Processing |
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Authors: | Yun FeiChen Zhen ShanWang |
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Affiliation: | 1.Department of Ship Engineering,Dalian University of Technology,and also with Key Laboratory for Underwater Test and Control Technology,Dalian 116013,China;2.Key Laboratory for Underwater Test &Control Technology,Dalian 116013,China |
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Abstract: | In bistaic acoustic testing, there will be strong direct blast interference. An algorithm based on signal phase-matching array processing that rejects direct blast interference in bistatic acoustic testing has been studied, through which the object scattering signal is accurately extracted. Characteristics of bistatic acoustic testing and signal phase matching processing principle are fully integrated in this algorithm. Firstly, the direct blast interference is calculated from the receiving signal based on three subarrays signal phase matching processing. Secondly, the direct blast is rejected by subtraction from the receiving signal. In this way the limitations of the high signal to noise ratio that signal phase matching processing required for direct calculating the object scattering signal can be avoided. Simulation and sea trial results show that, when the ratio of signal to interference is greater than -20 dB, this algorithm of direct blast interference rejection based phase matching signal processing can accurately extract the object scattering signal. |
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Keywords: | Bistatic acoustic testing direct blast interference rejection signal phase matching processing |
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