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Rejection of Direct Blast Interference Based on Signal Phase-Matching Array Processing
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作者 Yun-Fei Chen Zhen-Shan Wang +1 位作者 Bing Jia Gui-Juan Li 《Journal of Electronic Science and Technology》 CAS 2013年第1期106-109,共4页
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 st... 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. 展开更多
关键词 Bistatic acoustic testing direct blast interference rejection signal phase matching processing.
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Using a linear array to estimate the velocity of underwater moving targets 被引量:2
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作者 严光洪 陈志菲 孙进才 《Journal of Marine Science and Application》 2009年第4期343-347,共5页
A new method uses a linear array that takes advantage of underwater physical sound fields to estimate the velocity of an underwater moving target. The mathematical model was established by considering the geometric re... A new method uses a linear array that takes advantage of underwater physical sound fields to estimate the velocity of an underwater moving target. The mathematical model was established by considering the geometric relationship between the moving target installed with only two transducers to radiate sound of different frequencies and the linear array. In addition, deterministic maximum likelihood and signal phase matching algorithms were introduced to effectively find the directions of arrival (DOAs) of the sound sources of the two transducers installed on the target. Factors causing velocity measurement errors were considered. To track the target, a linear array with a compass, a pressure transducer, a signal conditioner and a digital recorder was configured. Relevant requirements for the array parameters were derived. The simulation showed that a 16-element array with an aperture of less than lm can measure velocity with relative error of no more', than 4% when including typical system errors. Anechoic pool and reservoir experiments confirmed these results. 展开更多
关键词 underwater velocity measurement linear array direction of arrival (DOA) deterministicmaximum likelihood signal phase matching
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