基于多普勒譜估計的多通道SAR盲重構方法
發(fā)布時間:2018-11-03 12:45
【摘要】:方位信號重構是多通道合成孔徑雷達(sythetic aperture radar,SAR)成像過程中關鍵的一個步驟。文中在現(xiàn)有算法的基礎上進行改進和擴展,提出了一種基于多普勒譜結構估計的多通道SAR盲重構方法,能夠有效解決模糊分量個數(shù)和位置變化,導向矢量未知時信號重構的問題。該方法借助Capon譜估計的思想獲得混疊多普勒譜的結構圖,然后根據(jù)結構圖構造導向矢量,實現(xiàn)方位信號無模糊重構。所提出的算法能夠盡可能保持多普勒譜的完整性,并抑制多普勒譜邊緣的噪聲。仿真實驗驗證了所提算法的有效性。
[Abstract]:Azimuth signal reconstruction is a key step in multi-channel synthetic aperture radar (sythetic aperture radar,SAR) imaging. In this paper, we improve and extend the existing algorithms, and propose a multi-channel SAR blind reconstruction method based on Doppler spectral structure estimation, which can effectively solve the number and position changes of fuzzy components. The problem of signal reconstruction when the steering vector is unknown. Based on the idea of Capon spectrum estimation, the structure diagram of aliasing Doppler spectrum is obtained, and then the orientation vector is constructed according to the structure diagram to realize the azimuth signal without fuzzy reconstruction. The proposed algorithm can maintain the integrity of the Doppler spectrum as much as possible and suppress the noise in the edge of the Doppler spectrum. Simulation results show that the proposed algorithm is effective.
【作者單位】: 西安電子科技大學雷達信號處理國家重點實驗室;西安電子科技大學信息感知技術協(xié)同創(chuàng)新中心;
【基金】:國家自然科學基金(61301292) 空間測控通信創(chuàng)新探索基金(201509A)資助課題
【分類號】:TN957.52
本文編號:2307832
[Abstract]:Azimuth signal reconstruction is a key step in multi-channel synthetic aperture radar (sythetic aperture radar,SAR) imaging. In this paper, we improve and extend the existing algorithms, and propose a multi-channel SAR blind reconstruction method based on Doppler spectral structure estimation, which can effectively solve the number and position changes of fuzzy components. The problem of signal reconstruction when the steering vector is unknown. Based on the idea of Capon spectrum estimation, the structure diagram of aliasing Doppler spectrum is obtained, and then the orientation vector is constructed according to the structure diagram to realize the azimuth signal without fuzzy reconstruction. The proposed algorithm can maintain the integrity of the Doppler spectrum as much as possible and suppress the noise in the edge of the Doppler spectrum. Simulation results show that the proposed algorithm is effective.
【作者單位】: 西安電子科技大學雷達信號處理國家重點實驗室;西安電子科技大學信息感知技術協(xié)同創(chuàng)新中心;
【基金】:國家自然科學基金(61301292) 空間測控通信創(chuàng)新探索基金(201509A)資助課題
【分類號】:TN957.52
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