一種基于鐘擺模型的艦船目標(biāo)成像方法
A Method of ISAR Ship Imaging Based on Pendulum Module
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摘要: 艦船目標(biāo)受海浪的影響而呈現(xiàn)多倍周期和隨機(jī)性的擺動。針對這種情況，提出了一種基于鐘擺模型的成像方法。該方法利用每個距離單元的相位歷程中所含大幅度的線性調(diào)頻分量進(jìn)行成像。為了補(bǔ)償實(shí)際目標(biāo)轉(zhuǎn)動過程中因不完全符合鐘擺轉(zhuǎn)動模型而引起的三階及更高階的相位誤差，在一階相位誤差估計算法的基礎(chǔ)上得出了二階相位誤差估計方法，并結(jié)合Radon-Wigner算法以及CLEAN法得出了比較穩(wěn)健的相位自聚焦方法。實(shí)測數(shù)據(jù)處理結(jié)果證實(shí)了該方法的有效性。
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關(guān)鍵詞:
- 逆合成孔徑雷達(dá);艦船成像;相位梯度自聚焦算法
Abstract: Driven by ocean wave, the swing of a ship possesses characters of multi-cycle and randomness. In this paper, imaging method based on pendulum module is proposed for dealing with these problems. This approach develops images from linear frequency modulation components that are included in the phase history in every range bin. To compensate the three and higher order phase errors, rank two phase estimator is presented based on the available theory of rank one phase estimator. A robust auto-focus algorithm is also presented based on the Randon-Wigner algorithm and the idea of CLEAN. The effectiveness of the algorithm is verified by processing of real data. -
張賢達(dá), 保錚. 非平穩(wěn)信號分析與處理.北京: 國防工業(yè)出版社, 1998.153186 .[4]Li Liwei.[J].Asif Raza, Mao Shiyi. Improvement of Rank One Phase Estimation(ROPE) autofocusing technique. Proc. of ICSP 98, Beijing, China.1998,:- -
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