基于STFT的相干宽带调频信号2-D到达角估计
2-D DOA Estimation of Coherent Wideband FM Signals Based on STFT
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摘要: 宽带调频信号(FM)作为具有宽频带和时变方向向量的非平稳信号，其到达角的估计具有较大的难度。该文利用短时傅里叶变换(STFT)和宽带调频信号的时频聚焦性建立了新颖的空间时频分布方程，并利用矩形平面阵数据的分维结构和基于矩形平面子阵堆栈的奇异值分解法估计了相干宽带FM信号的2-D到达角。理论分析和仿真实验表明了算法的可行性。Abstract: Wideband FM signal occupies a wide band in frequency domain and has a time-varying direction vector. Therefore it is difficult to estimate its DOA, particularly the method to estimate 2-D DOA of coherent wideband FM signals has not been reported. This paper constructs a novel time-frequency equation based on STFT and the time-frequency distribution of wideband FM signals. The structure of rectangular or array and the SVD based on the stack of rectangular sub-arrays are also exploited to estimate 2-D DOA of coherent wideband FM signals. Theoretical predictions and simulation results indicate the efficacy of the proposed algorithm.
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