基于STFT的相干寬帶調(diào)頻信號(hào)2-D到達(dá)角估計(jì)
2-D DOA Estimation of Coherent Wideband FM Signals Based on STFT
-
摘要: 寬帶調(diào)頻信號(hào)(FM)作為具有寬頻帶和時(shí)變方向向量的非平穩(wěn)信號(hào)，其到達(dá)角的估計(jì)具有較大的難度。該文利用短時(shí)傅里葉變換(STFT)和寬帶調(diào)頻信號(hào)的時(shí)頻聚焦性建立了新穎的空間時(shí)頻分布方程，并利用矩形平面陣數(shù)據(jù)的分維結(jié)構(gòu)和基于矩形平面子陣堆棧的奇異值分解法估計(jì)了相干寬帶FM信號(hào)的2-D到達(dá)角。理論分析和仿真實(shí)驗(yàn)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.
-
Amin M G. Spatial time-frequency distributions for direction finding and blind source separation[J].in Proc. SPIE.1999, 3723:62-70[2]Gershman A B, Amin M G. Wideband direction of arrival estimation of multiple chirp signals using spatial time-frequency distributions[J].IEEE Signal Processing Lett.2000, 7(6):152-155[3]Huang Ke-ji, Tian Da, Chen Tian-qi. Direction-of-arrival estimation of wideband chirp signals using the Wigner ditribution of symmetrical sensor array. ICCCAS02, Chengdu, China, 2002:[4]25-1028.[5]Zoltowski M D. Beamspace root-MUSIC. IEEE Trans.on SP 1993, 41(1): 344.[6]Peleg S, Porat B. Linear FM signal parameter estimation from discrete-time observations. IEEE Trans on. AES, 1991, 27(4): 607-614. -
計(jì)量
- 文章訪問(wèn)數(shù): 5750
- HTML全文瀏覽量: 135
- PDF下載量: 669
- 被引次數(shù): 0
下載:
