基于分数阶傅里叶变换的GNSS接收机抗线性调频干扰技术研究
|
摘要
研究了分数阶傅里叶变换(Fractional Fourier Transform,FRFT)抗线性调频(Linear Frequency Modulation,LFM)干扰技术,提出了一种基于FRFT域幅度一阶矩的逐精度求取最佳变换阶次的方法,并针对连续LFM干扰提出了一种求取最佳变换阶次的策略。同时针对全球导航卫星系统(Global Navigation Satellite System,GNSS)中的LFM干扰,对信号的预处理、阈值的自适应选取做了研究与分析,给出了相应的处理方法。仿真结果表明,该方法能够减少抗连续LFM干扰时求取最佳变换阶次的计算量,而且可以有效抑制GNSS接收机中的LFM干扰。
The linear frequency modulation(LFM)interference suppression technology based on the fractional Fourier transform(FRFT)is studied and a method of calculating the optimal transformation order of transformation by progressive grade of precision based on the first-order moment of the amplitude in the FRFT domain is proposed in this paper.At the same time,for the continuous LFM interference,a strategy of calculating the optimal transformation order of FRFT is proposed.In addition,for the LFM interference in GNSS receiver,signal preprocessing and adaptive threshold selection are studied and analyzed,and corresponding solutions are presented.The simulation results show that the method proposed in this paper can effectively reduce the calculation amount of getting the optimal transformation order of continuous LFM interference and suppress the LFM interference in GNSS receiver efficiently.
The linear frequency modulation(LFM)interference suppression technology based on the fractional Fourier transform(FRFT)is studied and a method of calculating the optimal transformation order of transformation by progressive grade of precision based on the first-order moment of the amplitude in the FRFT domain is proposed in this paper.At the same time,for the continuous LFM interference,a strategy of calculating the optimal transformation order of FRFT is proposed.In addition,for the LFM interference in GNSS receiver,signal preprocessing and adaptive threshold selection are studied and analyzed,and corresponding solutions are presented.The simulation results show that the method proposed in this paper can effectively reduce the calculation amount of getting the optimal transformation order of continuous LFM interference and suppress the LFM interference in GNSS receiver efficiently.
引文
[1]申丽然,郭黎利,尹清波.基于分数阶傅里叶变换的直扩通信快速线性调频干扰抑制[J].科学技术与工程,2014,14(1):59-65.
[2]刘明玲,刘高辉.基于分数阶Fourier变换的多分量LFM信号检测[J].电子科技,2014,27(10):133-135.
[3]Ouyang X,Amin M G.Short-time Fourier transform receiver for nonstationary interference excision in direct sequence spread spectrum communications[J].IEEE Transactions on Signal Processing,2001,51(4):851-863.
[4]Namias V.The fractional Fourier transform and its application in quantum mechanics[J].Geoderma,1980,25(3):241-265.
[5]陶然,齐林,王越.分数阶Fourier变换的原理与应用[M].北京:清华大学出版社,2004.
[6]Ozaktas H M,Arikan O,Kutay M A,et al.Digital computation of the fractional Fourier transform[J].IEEE Transactions on Signal Processing,1996,44(9):2141-2150.
[7]黄克武,陶然,吴葵,等.分数阶傅里叶域与时域联合干扰抑制研究[J].中国科学:技术科学,2011(10):1393-1404.
[8]聂晶,张春雷,卫红凯.分数阶Fourier变换对LFM信号估计方法研究[C]//中国声学学会水声学分会学术会议,2015.
[9]梅检民,肖云魁,周斌,等.基于FRFT的改进多尺度线调频基稀疏信号分解方法[J].振动工程学报,2013,26(1):135-142.
[10]卫红凯,王平波,蔡志明,等.分数阶Fourier变换极值搜索算法研究[J].电子学报,2010,38(12):2949-2952.
[11]张永飞,魏安全,孙玉琦.DSSS系统LFM干扰抑制技术研究[J].电子质量,2011(7):1-3.
[12]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.
[13]张玉恒,张勇.基于分数阶傅里叶域K谱线算法的LFM干扰抑制[J].系统仿真学报,2009,21(15):4794-4796.
[14]安澄全,郝冬艳.LFM信号的分数阶傅里叶域自适应滤波算法研究[J].信号处理,2013,29(1):54-59.
[15]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,2003,24(4):499-503.
[2]刘明玲,刘高辉.基于分数阶Fourier变换的多分量LFM信号检测[J].电子科技,2014,27(10):133-135.
[3]Ouyang X,Amin M G.Short-time Fourier transform receiver for nonstationary interference excision in direct sequence spread spectrum communications[J].IEEE Transactions on Signal Processing,2001,51(4):851-863.
[4]Namias V.The fractional Fourier transform and its application in quantum mechanics[J].Geoderma,1980,25(3):241-265.
[5]陶然,齐林,王越.分数阶Fourier变换的原理与应用[M].北京:清华大学出版社,2004.
[6]Ozaktas H M,Arikan O,Kutay M A,et al.Digital computation of the fractional Fourier transform[J].IEEE Transactions on Signal Processing,1996,44(9):2141-2150.
[7]黄克武,陶然,吴葵,等.分数阶傅里叶域与时域联合干扰抑制研究[J].中国科学:技术科学,2011(10):1393-1404.
[8]聂晶,张春雷,卫红凯.分数阶Fourier变换对LFM信号估计方法研究[C]//中国声学学会水声学分会学术会议,2015.
[9]梅检民,肖云魁,周斌,等.基于FRFT的改进多尺度线调频基稀疏信号分解方法[J].振动工程学报,2013,26(1):135-142.
[10]卫红凯,王平波,蔡志明,等.分数阶Fourier变换极值搜索算法研究[J].电子学报,2010,38(12):2949-2952.
[11]张永飞,魏安全,孙玉琦.DSSS系统LFM干扰抑制技术研究[J].电子质量,2011(7):1-3.
[12]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.
[13]张玉恒,张勇.基于分数阶傅里叶域K谱线算法的LFM干扰抑制[J].系统仿真学报,2009,21(15):4794-4796.
[14]安澄全,郝冬艳.LFM信号的分数阶傅里叶域自适应滤波算法研究[J].信号处理,2013,29(1):54-59.
[15]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,2003,24(4):499-503.