时变单音干扰下GPS系统的性能分析及干扰抑制方法
|
摘要
针对实际系统中干扰源的移动特性,将干扰信道建模为时变瑞利衰落信道,分析了时变单音干扰下多普勒频移对GPS系统性能的影响并推导了误码率公式,提出了一种基于短时傅里叶的自适应时频域干扰抑制算法。该算法首先对接收到的GPS信号进行时频分析,检测出受到干扰的频点,然后设置合理的干扰剔除门限,最后通过自适应二阶IIR格型陷波器将所受干扰的频点剔除。与基于LMS的时域自适应滤波算法进行了对比,实验证明,所提算法对时变单音干扰具有较好的干扰抑制能力。
The interference channel is modeled as a time-varying fading channel as the motivation of the jamming sources in the practical scenario. Focusing on this problem,this paper analyzed the effect of the Doppler shift on the performance and derived the BER expression in the presence of time-varying single-tone jamming on GPS( global positioning system),and proposed an adaptive short-time Fourier transform( STFT)-based jamming mitigation system. Firstly,it made a time-frequency( TF) analysis of the received GPS signals to detect the contaminated frequency bins,and then set a proper threshold which used to mitigate the jamming signal. Finally,it used a second-order IIR filter with a lattice structure to null the estimated contaminated frequencies. Compared with the adative filtering algorithm based on LMS,simulation results show that the proposed method can perform better than adaptive filtering techniques.
The interference channel is modeled as a time-varying fading channel as the motivation of the jamming sources in the practical scenario. Focusing on this problem,this paper analyzed the effect of the Doppler shift on the performance and derived the BER expression in the presence of time-varying single-tone jamming on GPS( global positioning system),and proposed an adaptive short-time Fourier transform( STFT)-based jamming mitigation system. Firstly,it made a time-frequency( TF) analysis of the received GPS signals to detect the contaminated frequency bins,and then set a proper threshold which used to mitigate the jamming signal. Finally,it used a second-order IIR filter with a lattice structure to null the estimated contaminated frequencies. Compared with the adative filtering algorithm based on LMS,simulation results show that the proposed method can perform better than adaptive filtering techniques.
引文
[1]Capozza P T,Hollad B J,Hopkinson T M,et al.A single-chip narrow-band frequency-domain excisor for a global positioning system(GPS)receiver[J].IEEE Journal of Solid-State Circuits,2000,35(3):401-411.
[2]刘拥军,胡捍英.GPS频域抗干扰算法研究[J].信号处理,2009,25(11):1738-1741.
[3]Mohammad J R,Mohsen A,Mohammad R M.New GPS anti-jamming system based on multiple short-time Fourier transform[J].IET Radar,Sonar&Navigation,2016,10(4):807-815.
[4]Chien Yingren.Hybrid successive continuous wave interference cancellation scheme for global positioning system receivers[J].Journal of Engineering,2013(7):7-14.
[5]Wang Xin,Tan Zhenhui,Zhu Gang,et al.Doppler frequency shift estimation for rician channel in high-speed mobile communication[C]//Proc of the 8th International Conference on Signal Processing.Piscataway,NJ:IEEE Press,2006:1-5.
[6]郝张红,赵宏志,邵士海,等.时变多音干扰下TD-SCDMA系统性能分析[J].电子科技大学学报,2014,43(2):184-187.
[7]Li Ye,Jr Cimini L J.Bounds on the interchannel interference of OFDM in time-varying impairments[J].IEEE Trans on Communications,2001,49(3):401-404.
[8]张邦宁,魏安全,郭道省,等.通信抗干扰技术[M].北京:机械工业出版社,2006:54-58.
[9]Goldsmith A.无线通信[M].杨鸿文,李卫东,郭文彬,等译.北京:人民邮电出版社,2007:144-159.
[10]Quyang Xuemei,Amin M G.Short-time Fourier transform receiver for non-stationary interference excision in direct sequence spread spectrum communications[J].IEEE Trans on Signal Processing,2001,49(4):851-863.
[11]Borio D,Camoriano L,Savasta S,et al.Time-frequency excision for GNSS applications[J].IEEE Systems Journal,2008,2(1):27-37.
[12]Chien Yingren.Design of GPS anti-jamming systems using adaptive notch filters[J].IEEE Systems Journal,2015,9(2):451-460.
[13]龚耀寰.自适应滤波[M].2版.北京:电子工业出版社,2003:181-183.
[14]郝张红,赵志红,邵世海,等.直扩系统时变单音干扰抑制的新方法[J].信号处理,2014,30(7):777-782.
[15]Wang Zhangsheng,Lyu Ming,Tang Bin.Paper application of partial coefficient update LMS algorithm to suppress narrowband interference in DSSS system[C]//Proc of International Conference on Communication Software and Networks.Washington DC:IEEE Computer Society,2009:275-278.
[16]Provencher S.Estimation of complex single-tone parameters in the DFT domain[J].IEEE Trans on Signal Processing,2010,58(7):3879-3883.
[17]Purwar A,Joshi D,Chaubey V K.GPS signal jamming and anti-jamming strategy:a theoretical analysis[C]//Proc of IEEE Annual India Conference.Piscataway,NJ:IEEE Press,2017.
[18]Savasta S,Presti L L.Interference mitigation in GNSS receivers by a time-frequency approach[J].IEEE Trans on Aerospace and Electronic Systems,2013,49(1):415-433.
[19]Mosavi M R,Pashaian M.Jamming mitigation in global positioning system receivers using wavelet packet coefficients thresholding[J].IET Signal Processing,2015,9(5):457-464.
[2]刘拥军,胡捍英.GPS频域抗干扰算法研究[J].信号处理,2009,25(11):1738-1741.
[3]Mohammad J R,Mohsen A,Mohammad R M.New GPS anti-jamming system based on multiple short-time Fourier transform[J].IET Radar,Sonar&Navigation,2016,10(4):807-815.
[4]Chien Yingren.Hybrid successive continuous wave interference cancellation scheme for global positioning system receivers[J].Journal of Engineering,2013(7):7-14.
[5]Wang Xin,Tan Zhenhui,Zhu Gang,et al.Doppler frequency shift estimation for rician channel in high-speed mobile communication[C]//Proc of the 8th International Conference on Signal Processing.Piscataway,NJ:IEEE Press,2006:1-5.
[6]郝张红,赵宏志,邵士海,等.时变多音干扰下TD-SCDMA系统性能分析[J].电子科技大学学报,2014,43(2):184-187.
[7]Li Ye,Jr Cimini L J.Bounds on the interchannel interference of OFDM in time-varying impairments[J].IEEE Trans on Communications,2001,49(3):401-404.
[8]张邦宁,魏安全,郭道省,等.通信抗干扰技术[M].北京:机械工业出版社,2006:54-58.
[9]Goldsmith A.无线通信[M].杨鸿文,李卫东,郭文彬,等译.北京:人民邮电出版社,2007:144-159.
[10]Quyang Xuemei,Amin M G.Short-time Fourier transform receiver for non-stationary interference excision in direct sequence spread spectrum communications[J].IEEE Trans on Signal Processing,2001,49(4):851-863.
[11]Borio D,Camoriano L,Savasta S,et al.Time-frequency excision for GNSS applications[J].IEEE Systems Journal,2008,2(1):27-37.
[12]Chien Yingren.Design of GPS anti-jamming systems using adaptive notch filters[J].IEEE Systems Journal,2015,9(2):451-460.
[13]龚耀寰.自适应滤波[M].2版.北京:电子工业出版社,2003:181-183.
[14]郝张红,赵志红,邵世海,等.直扩系统时变单音干扰抑制的新方法[J].信号处理,2014,30(7):777-782.
[15]Wang Zhangsheng,Lyu Ming,Tang Bin.Paper application of partial coefficient update LMS algorithm to suppress narrowband interference in DSSS system[C]//Proc of International Conference on Communication Software and Networks.Washington DC:IEEE Computer Society,2009:275-278.
[16]Provencher S.Estimation of complex single-tone parameters in the DFT domain[J].IEEE Trans on Signal Processing,2010,58(7):3879-3883.
[17]Purwar A,Joshi D,Chaubey V K.GPS signal jamming and anti-jamming strategy:a theoretical analysis[C]//Proc of IEEE Annual India Conference.Piscataway,NJ:IEEE Press,2017.
[18]Savasta S,Presti L L.Interference mitigation in GNSS receivers by a time-frequency approach[J].IEEE Trans on Aerospace and Electronic Systems,2013,49(1):415-433.
[19]Mosavi M R,Pashaian M.Jamming mitigation in global positioning system receivers using wavelet packet coefficients thresholding[J].IET Signal Processing,2015,9(5):457-464.