基于并行全相位點通濾波的高性能互素譜分析方法
doi: 10.11999/JEIT190317
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天津大學(xué)電氣自動化與信息工程學(xué)院 天津 300072
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天津大學(xué)青島海洋技術(shù)研究院 青島 266200
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天津大學(xué)微電子學(xué)院 天津 300072
High-performance Co-prime Spectral Analysis Method Based on Parallelled All-phase Point-pass Filtering
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School of Electrical and Information Engineering, Tianjin University, Tianjin 300072, China
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Qingdao Institute of Ocean Technology, Tianjin University, Qingdao 266200, China
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School of Microelectronics, Tianjin University, Tianjin 300072, China
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摘要:
為根本消除欠采樣寬頻譜分析中的偽峰副效應(yīng)，該文提出基于并行全相位點通濾波的高性能互素譜分析方法。通過剖析經(jīng)典互素譜分析的機理，指出產(chǎn)生偽峰效應(yīng)的根源在于上、下通道的多相濾波支路之間存在多余的重疊邊界頻帶。故借助全相位點通濾波器組來取代經(jīng)典互素譜的原型濾波器，并且推導(dǎo)出基于并行點通濾波的互素譜分析流程。理論分析和仿真實驗均表明，新的方法顯著改善譜分析性能：不僅從根本上消除了偽峰產(chǎn)生的可能，而且相比于經(jīng)典互素譜分析還大大提升了譜分辨率，從而具有較高的密集譜成分辨識性能。在軟件無線電、雷達(dá)探測、無源定位、海事無線電等領(lǐng)域有廣泛應(yīng)用前景。
Abstract:In order to completely remove the spurious-peak side effect in the undersampling based wide-band spectral analysis, this paper proposes a high-performance co-prime spectral analysis method based on paralleled all-phase point-pass filtering. On basis of a deep analysis on the mechanism of the classical co-prime spectral analysis, it is discovered that this spurious-peak side effect arises from those redudant overlapping boundary-bands related to distinct polyphase filtering branches between the up data path and the down data path. Therefore, through replacing the prototype filters in the classical co-prime spectral analysis by the all-phase point-pass filtering banks, a novel co-prime analysis dataflow is derived based on paralleled all-phase point-pass filtering. Both theoretic analysis and numerical simulation show that the proposed spectral analysis method achieves remarkable performance improvement: it can not only completely remove the spurious-peak side effect, but also obtain a much higher spectral resolution than the classical co-prime analysis, thereby possessing another merit of distinguishing dense spectral components. The proposed spectral analysis method possesses vast potentials in the software-defined radio, radar detection, passive positioning and marine wireless communication etc.
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