采用复调制选带傅里叶变换的毫米波特征提取

Millimeter Wave Characteristic Extraction Based on Complex Modulation Zoom Fourier Transform

针对毫米波引信对目标特征提取时传统差频快速傅里叶变换探测精度不足、运算量大的问题,提出采用复调制选带傅里叶变换(ZFFT)的毫米波特征提取算法。该方法的实质是通过对毫米波信号频谱中的局部信号进行复调制、移频、滤波、降采样后作点数较少的FFT实现对信号频谱的局部细化,提取其有效频率特征信息。实测导弹模型5mm信号数据和试验表明:采用复调制ZFFT的毫米波特征提取算法简便、存储及运算量小、速度快,适用于毫米波引信对实时性的要求。

Aiming at the problem of insufficient detection precision and large computational complexity of con-ventional difference frequency fast Fourier transform in the target characteristic extraction for millimeter wave fuze,an algorithm of the complex modulation ZFFT millimeter wave characteristic extraction was proposed.The algorithm realize the local refinement of signal spectrum using less points FFT through implement complex mod-ulation,frequency shift,filtering and down sampling for local signal in difference frequency signal frequency spectrum,so as to extract the effective frequency characteristic information.The measured missile model 5 mm signal data and test showed that the millimeter wave feature extraction algorithm based on the complex modula-tion ZFFT was simple,less storage and computational complexity,suitable for real-time requirements for milli-meter wave fuze.