用均勻圓陣實(shí)現(xiàn)寬頻段來波信號頻率和二維角估計(jì)
REAL-TIME FREQUENCY AND 2D ANGLE ESTIMATION OF WIDE FREQUENCY BAND SIGNALS WITH UNIFORM CIRCULAR ARRAYS
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摘要: 本文提出了一種在DFT波束空間實(shí)時估計(jì)入射到均勻圓陣(UCA)上寬頻段(1～18GHz)信號的頻率、方位角和仰角的方法。該方法可在時間欠采樣條件下實(shí)現(xiàn)頻率無模糊估計(jì),在空間欠采樣條件下,用整數(shù)搜索法實(shí)現(xiàn)方位角和仰角無模糊估計(jì),且頻率、方位角和仰角估計(jì)可自動配對。模擬頻率間接估計(jì)算法的估計(jì)方差比直接估計(jì)算法的方差要小2～3個數(shù)量級。仿真實(shí)驗(yàn)表明了算法是有效的。
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關(guān)鍵詞:
- 寬頻段信號; 頻率和二維角估計(jì); 均勻圓陣; 自動配對
Abstract: A method is presented for real-time estimation of the frequency, azimuth and elevation angles of the signal incident on uniform circular arrays(UCA) over a very wide frequency band(1~18GHz) in DFT beamspace. The method provides unambiguous frequency estimation under temporal undersampling and unambiguous azimuth and elevation estimation using integer search algorithm under spatial undersampling. The estimations of azimuth and elevation angles are automatically paired with corresponding frequency estimates. The variance of the frequency estimates of indirect method is 2～3 magnitudes less than that of the direct method.Simulations are presented demonstrating the capabilities of the method. -
Zoltowski M D, Mathews C P. Real-time frequency and 2-D angle estimation with sub-Nyquist spatio-temporal sampling. IEEE Trans. on SP 1994, SP-42(10): 2781-2794.[2]肖先踢.空間譜估計(jì)測向技術(shù)應(yīng)用前景.電子對抗國防重點(diǎn)實(shí)臉皇論文集,1994.[3]Padmini C U,Naidu P S. Circular array and estimation of direction of arrival of a broadband source[J].Signal Processing.1994, 37:243-254[4]McCormick W S. Suboptimal real-time frequency/incident-angle estimation for multiple radar pulse. IEE Proc. -F, 1991, 138(3): 247-254. -
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