High-performance Co-prime Spectral Analysis Method Based on Parallelled All-phase Point-pass Filtering
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摘要:
为根本消除欠采样宽频谱分析中的伪峰副效应，该文提出基于并行全相位点通滤波的高性能互素谱分析方法。通过剖析经典互素谱分析的机理，指出产生伪峰效应的根源在于上、下通道的多相滤波支路之间存在多余的重叠边界频带。故借助全相位点通滤波器组来取代经典互素谱的原型滤波器，并且推导出基于并行点通滤波的互素谱分析流程。理论分析和仿真实验均表明，新的方法显著改善谱分析性能：不仅从根本上消除了伪峰产生的可能，而且相比于经典互素谱分析还大大提升了谱分辨率，从而具有较高的密集谱成分辨识性能。在软件无线电、雷达探测、无源定位、海事无线电等领域有广泛应用前景。
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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