基于FRFT的调频引信LFM干扰抑制改进方法
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摘要
针对分数阶傅里叶变换(FRFT)在抑制无线电引信LFM干扰时存在计算效率低、误差大的问题,提出了基于FRFT的调频引信LFM干扰抑制改进方法。该方法采用直接离散化算法计算FRFT,将FRFT计算转换为矩阵乘列向量的形式,并采用两级搜索法得到最佳变换阶数。仿真分析表明该方法可以减小运算量,提高信号的信干比,实现调频引信LFM干扰抑制。
In order to overcome the problems of low computational efficiency and large error of fractional Fourier transform(FRFT) in suppressing LFM interference of radio fuze, an improved LFM interference suppression method of FM fuze based on FRFT was proposed. In this method, a direct discretization algorithm was proposed to calculate FRFT. The FRFT calculation was transformed into matrix multiplier vector, and the optimal transformation order was obtained by two-stage search method. Simulation results showed that this method could reduce the computational complexity, improve signal to interference ratio and achieve LFM interference suppression of FM fuze.
In order to overcome the problems of low computational efficiency and large error of fractional Fourier transform(FRFT) in suppressing LFM interference of radio fuze, an improved LFM interference suppression method of FM fuze based on FRFT was proposed. In this method, a direct discretization algorithm was proposed to calculate FRFT. The FRFT calculation was transformed into matrix multiplier vector, and the optimal transformation order was obtained by two-stage search method. Simulation results showed that this method could reduce the computational complexity, improve signal to interference ratio and achieve LFM interference suppression of FM fuze.
引文
[1]齐杏林,刘尚合,李宏建.引信信息型和功率(能量)型干扰的概念及其特性分析[J].探测与控制学报,1999,21(2):32-35.
[2]唐珣.无线通信系统中分数傅里叶变换及相频处理技术研究[D].哈尔滨:哈尔滨工业大学,2010.
[3]朱全银,邓建平.基于分数阶傅里叶变换的线性调频干扰抑制[J].探测与控制学报,2009,31(1):10-14.
[4]张淑宁,赵惠昌,吴兵.基于分数阶傅立叶变换的伪码体制引信线性调频干扰抑制技术[J].兵工学报,2006(1):32-36.
[5]王茂汶,李涛,周涛.基于瞬时自相关和FRFT的LFM信号检测性能研究[J].电子信息对抗技术,2013,28(5):1-5.
[6]陶然.分数阶Fourier变换的原理与应用[M].北京:清华大学出版社,2004.
[7]张碧雄.基于FrFT空间目标探测与高精度频率估计[J].信息与电子工程,2011,9(6):749-753.
[8]齐林,陶然,周思永,等.基于分数阶傅里叶变换的线性调频信号的自适应时频滤波[J].兵工学报,2003(4):499-503.
[9]杨秀丽,冯小平.基于分数阶傅里叶变换的Chirp信号参数估计及恢复[J].空间电子技术,2007(3):78-81.
[10]刘立,张衡阳,毛玉泉,等.变换域通信系统自适应N-sigma幅度谱成型算法[J].计算机应用,2016,36(6):1492-1495+1501.
[11]孟祥意,陶然,王越.分数阶傅里叶域滤波器组的一般化设计方法[J].电子学报,2009,37(9):2046-2051.
[2]唐珣.无线通信系统中分数傅里叶变换及相频处理技术研究[D].哈尔滨:哈尔滨工业大学,2010.
[3]朱全银,邓建平.基于分数阶傅里叶变换的线性调频干扰抑制[J].探测与控制学报,2009,31(1):10-14.
[4]张淑宁,赵惠昌,吴兵.基于分数阶傅立叶变换的伪码体制引信线性调频干扰抑制技术[J].兵工学报,2006(1):32-36.
[5]王茂汶,李涛,周涛.基于瞬时自相关和FRFT的LFM信号检测性能研究[J].电子信息对抗技术,2013,28(5):1-5.
[6]陶然.分数阶Fourier变换的原理与应用[M].北京:清华大学出版社,2004.
[7]张碧雄.基于FrFT空间目标探测与高精度频率估计[J].信息与电子工程,2011,9(6):749-753.
[8]齐林,陶然,周思永,等.基于分数阶傅里叶变换的线性调频信号的自适应时频滤波[J].兵工学报,2003(4):499-503.
[9]杨秀丽,冯小平.基于分数阶傅里叶变换的Chirp信号参数估计及恢复[J].空间电子技术,2007(3):78-81.
[10]刘立,张衡阳,毛玉泉,等.变换域通信系统自适应N-sigma幅度谱成型算法[J].计算机应用,2016,36(6):1492-1495+1501.
[11]孟祥意,陶然,王越.分数阶傅里叶域滤波器组的一般化设计方法[J].电子学报,2009,37(9):2046-2051.