發(fā)布時間：2018-02-11 20:06

  本文關(guān)鍵詞： 微多普勒效應(yīng) 激光探測 時頻分析 矩形旋翼 弦長估計　出處：《光子學(xué)報》2017年07期 　論文類型：期刊論文

【摘要】：為實現(xiàn)基于微多普勒效應(yīng)的旋翼目標激光探測與識別,研究了面目標旋翼對激光回波的調(diào)制作用.利用物理光學(xué)法中面元散射回波疊加原理,構(gòu)建了矩形面旋翼的微多普勒激光回波模型.通過仿真,利用時頻分析方法提取了異于線目標模型的微多普勒特征.機理分析證實該特征反映弦長即旋翼橫向尺寸信息,據(jù)此提出了相干探測激光回波的矩形旋翼弦長計算方法.不同展弦比旋翼的回波仿真結(jié)果與理論公式吻合較好,驗證了該方法的有效性.誤差分析表明,與進行單一窗長條件下的短時傅里葉變換相比,利用改變窗長的方法分別提取時間、頻率信息可有效減小弦長計算誤差至1.58%.該模型可實現(xiàn)對旋翼飛行器弦長尺寸的計算,為進一步的旋翼形狀探測識別提供了依據(jù).
[Abstract]:In order to realize the rotor target laser detection and recognition based on micro Doppler effect, study the modulation effect of rotor surface target of laser echo. Using the physical optics method in scattering superposition principle, build a micro Doppler laser echo model of rectangular plane rotor. Through the simulation, using the time-frequency analysis method to extract the micro Doppler feature different on line target model. Mechanism analysis confirmed that the chord that reflects the characteristics of rotor transverse dimension information was proposed based on coherent detection of laser echo rectangular rotor chord length calculation method. The different aspect ratio of echo simulation results agree well with the theoretical formula of the rotor, verify the effectiveness of the method. The error analysis shows that, compared with the short term the Fourier transform of the single window length conditions, by changing the method of window length were extracted from the time frequency information can effectively reduce the calculation error of chord length to 1.58%. This model can be used to compute the rotorcraft chord size, provide the basis for further identification of rotor shape detection.

【作者單位】： 解放軍電子工程學(xué)院脈沖功率激光技術(shù)國家重點實驗室;
【基金】：國家自然科學(xué)基金(No.61271353)資助~~
【分類號】：TN958.98;V218

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