基于PLL环路的卫星QPSK载波调制信号相位跟踪算法
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摘要
卫星信号接收端天线接收的卫星信号经过射频前端处理后会变成数字中频信号,而相位跟踪是中频信号处理的重要环节,准确的相位跟踪可以为卫星信号解码、测距和定位等功能的准确性提供保障.基于此,该文提出了基于锁相环(Phase Locked Loop,PLL)的卫星QPSK载波调制信号相位跟踪算法.该算法利用多路正交载波和二象反正切鉴相器获取精确的相位差信息,形成闭合回路锁定载波相位以实现跟踪.实验结果表明,多路异相载波的方法可实现更快速的相位锁定,与传统Costas环路和松尾环相比,进入稳态时间分别减少了20%和24%以上,稳态方差分别减小21%和32%.
The received satellite signal will be converted into digital Intermediate Frequency(IF) signal after the radio frequency front-end processing. As one of the crucial parts in IF signal processing,the accurate phase tracking can ensure the precise satellite signal decoding,distance ranging,and positioning. Based on this,this paper proposes a Phase Locked Loop(PLL) based phase tracking algorithm for QPSK modulated satellite signals. Specifically,the algorithm uses multiple orthogonal carriers and arc-tangent based phase detector to obtain accurate phase difference information,which finally forms a closed loop to lock the carrier phase for the tracking. Experimental results showthat the multiple heterogeneous carrier is able to achieve fast phase locking. In addition,compared with the conventional Costas loop and Matsuo loop,the time cost for reaching steady state of our system is reduced by 20% and 24%,while the corresponding steady-state variance is reduced by21% and 32% respectively.
The received satellite signal will be converted into digital Intermediate Frequency(IF) signal after the radio frequency front-end processing. As one of the crucial parts in IF signal processing,the accurate phase tracking can ensure the precise satellite signal decoding,distance ranging,and positioning. Based on this,this paper proposes a Phase Locked Loop(PLL) based phase tracking algorithm for QPSK modulated satellite signals. Specifically,the algorithm uses multiple orthogonal carriers and arc-tangent based phase detector to obtain accurate phase difference information,which finally forms a closed loop to lock the carrier phase for the tracking. Experimental results showthat the multiple heterogeneous carrier is able to achieve fast phase locking. In addition,compared with the conventional Costas loop and Matsuo loop,the time cost for reaching steady state of our system is reduced by 20% and 24%,while the corresponding steady-state variance is reduced by21% and 32% respectively.
引文
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[15]王俊,李加琪,吴嗣亮.锁频环辅助下锁相环的跟踪误差分析[J].北京理工大学学报,2011,07:838-843.WANG Jun,LI Jiaqi,WU Siliang. Tracking error analysis of FLL assisted PLL[J]. Journal of Beijing Institute of Technology,2011,07:838-843.(in Chinese)
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[17]HEIDARPOUR A R,MONTAZEROLGHAEM M A,SABERALI S M. Performance investigation of the modified costas carrier recovery loop for a QPSK modulated signal in the presence of co-channel interference[A]. 2016 24th IEEE Iranian Conference on Electrical Engineering(ICEE)[C]. Shiraz,2016. 19-23.
[18]YANG Z,BAI Y,ZHAO Z. Design and implementation of the digital costas loop based on softw are defined radio[A]. First IEEE International Conference on Instrumentation,M easurement,Computer,Communication and Control[C]. Beijing,China,2011. 687-690.
[2] QIAN JINXI,LIU NAIJIN,YANG JINGHUI,et al. Research on the suppression of GM R interference in WCDM A satellite system[J]. Journal of Information and Computational Science,2015,12(4):1667-1674.
[3]倪娟,黄国策,佟阳,等. WCDMA卫星移动通信RAKE接收机性能分析[J].计算机工程与设计,2013,06:1901-1905.NI JUAN,HUANG GUOCE,TONG YANG,et al. Performance analysis of RAKE receiver for WCDM A in satellites communication[J]. Computer Engineeing&Design,2013,06:1901-1905.(in Chinese)
[4] KARI H,MARKKU J. Interference suppression in WCDM A dow nlink by symbol-level channel equalization[A].2002 11th European Signal Processing Conference[C].Toulouse,France,2002. 1-4.
[5]李建东,郭梯云,邬国扬.移动通信(第四版)[M].西安:西安电子科技大学出版社. 2006. 332-354.
[6] LIU C L,FEHER K. pi/4-QPSK modems for satellite sound/data broadcast systems[J]. IEEE Transactions on Broadcasting,1991,37(1):1-8.
[7]KAI B,NICOLAJ B,等.软件定义的GPS和伽利略接收机[M].北京:国防工业出版社. 2009. 78-90.
[8] YAIR LINN. Robust M-PSK phase detectors for carrier synchronization PLLs in coherent receivers:theory and simulations[J]. IEEE Transactions on Communications,2009,57(6):1794-1805.
[9]谢钢. GPS原理与接收机设计[M].北京:电子工业出版社. 2009. 266-294.
[10]GOLESTAN S,EBRAHIMZADEH E,GUERRERO J M,et al. An adaptive least-error squares filter-based phaselocked loop for synchronization and signal decomposition purposes[J]. IEEE Transactions on Industrial Electronics,2017,64(1):336-346.
[11] MOHAJERIN-ARIAEI A,ZIYADI M,CHITGARHA M R,et al. Phase noise mitigation of QPSK signal utilizing phase-locked multiplexing of signal harmonics and amplitude saturation[J]. Optics letters,2015,40(14):3328
[12]ELLIOTT D K,CHRISTOPHER J H. GPS原理与应用(第二版)[M].北京:电子工业出版社. 2012. 111-130.
[13]SHI Y,YAN D. A research on the relationship between Kalman filter and phase locked loop[A]. 2016 Chinese Control and Decision Conference(CCDC)[C]. Yinchuan,Ningxia,2016. 5106-5110.
[14]李颖,庄再举,李洲周,等.基于可变带宽可控根FLLPLL跟踪算法分析与仿真[J].南开大学学报(自然科学版),2015,06:27-32.LI YING,ZHUANG ZAIJU,LI ZHOUZHOU,et al. Analysis and simulation of FLL-PLL tracking algorithm based on variable bandw idth controllable root[J]. Acta Scientiarum Naturalium Universitatis Nankaiensis,2015,06:27-32.(in Chinese)
[15]王俊,李加琪,吴嗣亮.锁频环辅助下锁相环的跟踪误差分析[J].北京理工大学学报,2011,07:838-843.WANG Jun,LI Jiaqi,WU Siliang. Tracking error analysis of FLL assisted PLL[J]. Journal of Beijing Institute of Technology,2011,07:838-843.(in Chinese)
[16]YOO Y,SEO C,HAN J,et al. Enhanced adaptive loop filter for motion compensated frame[J]. IEEE Transactions on Image Processing,2011,20(8):2177-2188.
[17]HEIDARPOUR A R,MONTAZEROLGHAEM M A,SABERALI S M. Performance investigation of the modified costas carrier recovery loop for a QPSK modulated signal in the presence of co-channel interference[A]. 2016 24th IEEE Iranian Conference on Electrical Engineering(ICEE)[C]. Shiraz,2016. 19-23.
[18]YANG Z,BAI Y,ZHAO Z. Design and implementation of the digital costas loop based on softw are defined radio[A]. First IEEE International Conference on Instrumentation,M easurement,Computer,Communication and Control[C]. Beijing,China,2011. 687-690.