基于微多普勒效应的旋翼弦长激光探测方法研究

发布时间：2018-02-11 20:06

本文关键词： 微多普勒效应激光探测时频分析矩形旋翼弦长估计　出处：《光子学报》2017年07期 　论文类型：期刊论文

【摘要】：为实现基于微多普勒效应的旋翼目标激光探测与识别,研究了面目标旋翼对激光回波的调制作用.利用物理光学法中面元散射回波叠加原理,构建了矩形面旋翼的微多普勒激光回波模型.通过仿真,利用时频分析方法提取了异于线目标模型的微多普勒特征.机理分析证实该特征反映弦长即旋翼横向尺寸信息,据此提出了相干探测激光回波的矩形旋翼弦长计算方法.不同展弦比旋翼的回波仿真结果与理论公式吻合较好,验证了该方法的有效性.误差分析表明,与进行单一窗长条件下的短时傅里叶变换相比,利用改变窗长的方法分别提取时间、频率信息可有效减小弦长计算误差至1.58%.该模型可实现对旋翼飞行器弦长尺寸的计算,为进一步的旋翼形状探测识别提供了依据.
[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.

【作者单位】：解放军电子工程学院脉冲功率激光技术国家重点实验室;
【基金】：国家自然科学基金(No.61271353)资助~~
【分类号】：TN958.98;V218

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