基于分数阶傅里叶变换的标量脱靶量测量新方法  

New Method for Scalar Miss Distance Measurement Based on the Fractional Fourier Transform

作　　者：邓兵[1] 陶然[2] 董云龙[1] 

机构地区：[1]海军航空工程学院电子信息工程系,山东烟台264001 [2]北京理工大学信息与电子学院,北京100081

出　　处：《兵工学报》2010年第12期1627-1631,共5页Acta Armamentarii

基　　金：国家杰出青年科学基金项目(60625104);国家自然科学基金面上项目(60902054);中国博士后科学基金资助项目(20090460114);"泰山学者"建设工程专项经费资助

摘　　要：针对多普勒测量法恒幅恒频假设在脱靶量点附近会引起较大的测频误差的问题,提出了一种基于恒幅chirp信号假设的准实时标量脱靶量测量方法。通过延长多普勒频率的拟合分段时长,有效地增大了积累时间。利用分数阶傅里叶变换的快速离散算法来实现。仿真结果表明,相比基于FFT的方法,测量精度更高、鲁棒性更好,尤其是在较低信噪比的情况下,但计算复杂度略有增加。Since the hypothesis of constant amplitude and constant frequency, adopted by the conventional miss distance measurement method using Doppler information, leads to notable estimation error of Doppler frequency around the closest point approaching the target, a quasi real-time method of scalar miss distance measurement is proposed based on the assumption of constant amplitude chirp signal. Through increasing the fitted segment time used for Doppler frequency, the integration duration is prolonged effectively. What＇s more, the proposed method is realized via the fast discrete algorithm of the fractional Fourier transform. The simulation results show that, compared with the real-time method of scalar miss distance measurement based on the FFT, this method can obtain higher accuracy and better robustness, particularly when the signal-noise-ratio is low relatively. However, the computation complexity rises slightly.

关 键 词：信息处理技术 脱靶量 多普勒频率 分数阶傅里叶变换 

分 类 号：TN957[电子电信—信号与信息处理] TP873[电子电信—信息与通信工程]