基于四階累積過(guò)的陣列擴(kuò)展
FOURTH-ORDER CUMULANT BASED ARRAY EXTENSION IN DIRECTION-FINDING
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摘要: 在陣列測(cè)向問(wèn)題中應(yīng)用高階累積量除了信息利用更充分和抑制高斯噪聲等優(yōu)點(diǎn)之外還具有陣列擴(kuò)展的功能.本文推導(dǎo)了基于四階累積量的陣列擴(kuò)展方法,研究了虛擬陣的結(jié)構(gòu).放寬了協(xié)方差方法對(duì)信源數(shù)目的限制.但該方法在窄帶多信號(hào)方向估計(jì)應(yīng)用中存在局限.本文還推導(dǎo)了四階相干問(wèn)題和陣列擴(kuò)展的限制條件.最后給出了實(shí)驗(yàn)舉例.
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關(guān)鍵詞:
- 陣列; 信號(hào)處理; 測(cè)向; 高階累積量
Abstract: In the array processing problem, the high-order cumulants not only are capable to reduce the Gaussian noises but also have the aperture extension property. The method of the aperture extension using the fourth-order cumulants are studied and the structure of the corresponding virtual array are presented in this paper. The fourth-order coherent problem in the application in the narrow-band direction-finding system is given and analyzed. We obtain the array aperture extension condition of the fourth-order cumulant-based method to the multiple sources case. The numerical results support the analytic results. -
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