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標題: | 基於時分複用多進多出雷達使用非均勻天線陣列進行迭代二維來向角和多普勒估計 Iterative Two-dimensional Direction of Arrival and Doppler Estimation based on Time-division Multiplexing MIMO Radar with Non-uniform Arrays |
作者: | 侯崇毅 Chung-Yi Hou |
指導教授: | 蘇炫榮 Hsuan-Jung Su |
關鍵字: | 時分複用多進多出雷達,非均勻天線陣列,壓縮感知,二維欠定來向角估測,迭代估計的方法, TDM MIMO radar,Non-uniform arrays,Compressive sensing,Underdetermined 2D-DoA estimation,Iterative estimation scheme, |
出版年 : | 2023 |
學位: | 碩士 |
摘要: | 時分複用多進多出雷達系統已經是一項實現高角度解析度前景廣闊的技術。我們將時分複用多進多出雷達與非均勻天線陣列結合,以提升角度解析度並且增加可以估測目標物的數量。在目標物有移動速度的場景下,速度引起的相位失真會導致角度-多普勒耦合,這就需要事先進行相位補償,以確保二維來向角的估測是正確的。
在本論文中,首先會應用離散傅立葉轉換來估計多普勒頻率,然後我們提出了低複雜度聯合塊正交匹配追蹤算法來執行二維欠定來向角估測,以充分利用空間自由度。我們所提出的低複雜度聯合塊正交匹配追蹤算法的效能表現與前人的算法差不多,但是複雜度卻降低了空間自由度取更號的數量級。 此外,我們還提出了一個迭代估計的方法,這個方法可以使得二為來向角和多普勒頻率估測更加準確。在迭代估計的方法中,我們利用多進多出雷達中虛擬天線的效應來使得多普勒頻率估計的解析度大幅上升。模擬結果將顯示我們所提出的算法和方法能夠提供傑出的效能表現。 Time-division multiplexing (TDM) multiple-input multiple-output (MIMO) radar system has been a promising technology for achieving high-angle resolution. We combine the TDM MIMO radar with the non-uniform arrays to enhance the angular resolution and increase the number of detectable sources. In the context of moving source scenario, the motion-induced phase distortion leads to angle-Doppler coupling, which requires the phase compensation in advance for estimating the two-dimensional (2D) direction of arrival (DoA) accurately. In this thesis, the discrete Fourier transform (DFT) is first applied to estimate the Doppler frequency and then the low-complexity joint block orthogonal matching pursuit (Joint-BOMP) algorithm is proposed to perform the underdetermined 2D-DoA estimation to fully exploit the degree of freedom (DoF). The proposed low-complexity Joint-BOMP can reach the performance as well as that of the previous works while the computational complexity can be reduced by the square root of DoF. Furthermore, we propose an iterative estimation scheme to make the 2D-DoA and Doppler frequency estimations more accurate. For the iterative estimation scheme, we make the estimation of Doppler frequency enjoy the effect of virtual array in the MIMO radar to increase the resolution. Simulation results will demonstrate that the proposed algorithm and scheme can provide superior performance. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/90521 |
DOI: | 10.6342/NTU202303626 |
全文授權: | 同意授權(限校園內公開) |
顯示於系所單位: | 電信工程學研究所 |
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