北斗卫星B1信号捕获算法研究
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摘要
捕获是北斗卫星数字信号处理的第一步,其性能对卫星定位速度有着巨大的影响。文章重点研究了传统的并行码相位捕获算法,分析其在捕获效率和灵敏度上的不足。在此基础上,提出了一种循环圆周移位的差分相干积分算法。该算法通过对输入信号的频谱序列进行圆周移位操作,代替在不同多普勒搜索单元下进行重复的载波剥离和FFT,从而减少了运算量,提高了捕获效率。同时采用差分相干积分的方法对相干积分结果进行共轭相乘以达到抑制噪声的效果,提高了捕获灵敏度。仿真结果表明,该算法能够快速的捕获到北斗卫星信号。同时在低信噪比场景下,依然具有较高的捕获灵敏度和效率。
Signal acquisition is the first step of BeiDou satellite digital signal processing,whose performance has a huge impact on satellite positioning. Focusing on the traditional acquisition algorithm of parallel code phase and due to its lack of capture efficiency and sensitivity,an algorithm based on cyclic circumferential shift and differential coherent integration is proposed in this paper. By performing a circular shift operation on the frequency spectrum sequence of input IF signal,the proposed method replaces the repeated carrier stripping and FFT operations under different doppler search units,which reduces the computation and improves the capture efficiency. At the same time,the differential coherent integration method of conjugating multiple coherent integration results is used to suppress noise and improve the sensitivity. Simulation results show that the proposed algorithm can capture BeiDou satellite signals quickly and has a higher capture sensitivity and efficiency in a low SNR environment.
Signal acquisition is the first step of BeiDou satellite digital signal processing,whose performance has a huge impact on satellite positioning. Focusing on the traditional acquisition algorithm of parallel code phase and due to its lack of capture efficiency and sensitivity,an algorithm based on cyclic circumferential shift and differential coherent integration is proposed in this paper. By performing a circular shift operation on the frequency spectrum sequence of input IF signal,the proposed method replaces the repeated carrier stripping and FFT operations under different doppler search units,which reduces the computation and improves the capture efficiency. At the same time,the differential coherent integration method of conjugating multiple coherent integration results is used to suppress noise and improve the sensitivity. Simulation results show that the proposed algorithm can capture BeiDou satellite signals quickly and has a higher capture sensitivity and efficiency in a low SNR environment.
引文
[1]鲁郁.北斗/GPS双模软件接收机原理与实现技术[M].北京:电子工业出版社,2016.
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[10]刘瑞华,孔月明,蔚保国.GPS软件接收机基带信号处理算法及验证[J].航天控制,2016(1):3-8.
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[13]Zhang B,Hong-Jiao M A.A study of acquisition algorithm based on circumference displacement for GPS software receiver[J].Journal of Time&Frequency,2013,36(2):106-112.
[14]张瑜,郭里婷.基于相干累加北斗弱信号的改进捕获算法[J].微型机与应用,2017(24):8-10.
[15]宦烨,刘以安,薛松.基于弱信号环境的改进捕获算法[J].小型微型计算机系统,2017,38(1):189-192.
[16]韩志凤,刘建业,李荣冰.基于差分相关积分的北斗弱信号快速捕获方法[J].中国惯性技术学报,2016,24(6):815-820.
[17]朱兵,叶水勇,邵名声,等.基于北斗系统的杆塔在线监测系统研究[J].陕西电力,2016(4):51-53,59.
[18]周志恒,赵建军,杨利斌,等.舰艇作战系统海上动态对准技术研究[J].工业仪表与自动化装置,2016(3):125-128.
[19]陈钊,黄凤辰,花再军.一种基于北斗卫星通信的远程水情测报系统RTU设计[J].工业仪表与自动化装置,2016(6):84-86.
[20]洪杰,林密,陈明,等.基于北斗导航的电网移动应急系统设计[J].自动化与仪器仪表,2017(12):63-65.
[2]樊静.GPS弱信号的高灵敏度捕获算法[J].重庆邮电大学学报:自然科学版,2012,24(3):326-329.
[3]Yu L,Xing Z.Study on simulation based on GPSbase band signals acquisition algorithm[J].Journal of Chinese Computer Systems,2011,32(6):1237-1239.
[4]张北帆.GPS卫星信号的捕获算法研究[J].电子科技,2017,30(2):30-32.
[5]谢钢.GPS原理与接收机设计[M].北京:电子工业出版社,2009.
[6]张利伟,赵冬青,彭少磊.圆周移位在伪码补零BDS信号捕获算法中的应用[J].测绘科学技术学报,2017(5):466-469.
[7]黄海生,张伟,赵焕焕.GPS并行频率域捕获算法分析[J].西安邮电大学学报,2016,21(3):38-41.
[8]Yongqiang X,Haisheng H,Xinliang C.A difference acquisition algorithm for Beidou B1 MEO/IG-SO satellite[J].Application of Electronic Technique,2018,44(6):90-93.
[9]王尔申.北斗接收机B1信号改进捕获算法研究[J].沈阳航空航天大学学报,2018,35(2):82-87.
[10]刘瑞华,孔月明,蔚保国.GPS软件接收机基带信号处理算法及验证[J].航天控制,2016(1):3-8.
[11]Zeng Q,Zhang P,Ma S,et al.Beidou combinedFFT acquisition algorithm for resource-constrained embedded platform[C]//IEEE International Conference on Signal Processing,Communications and Computing.IEEE,2016:1-5.
[12]史向男,巴晓辉,陈杰.北斗MEO/IGSO卫星B1频点信号捕获方法研究[J].国外电子测量技术,2013,32(4):19-21.
[13]Zhang B,Hong-Jiao M A.A study of acquisition algorithm based on circumference displacement for GPS software receiver[J].Journal of Time&Frequency,2013,36(2):106-112.
[14]张瑜,郭里婷.基于相干累加北斗弱信号的改进捕获算法[J].微型机与应用,2017(24):8-10.
[15]宦烨,刘以安,薛松.基于弱信号环境的改进捕获算法[J].小型微型计算机系统,2017,38(1):189-192.
[16]韩志凤,刘建业,李荣冰.基于差分相关积分的北斗弱信号快速捕获方法[J].中国惯性技术学报,2016,24(6):815-820.
[17]朱兵,叶水勇,邵名声,等.基于北斗系统的杆塔在线监测系统研究[J].陕西电力,2016(4):51-53,59.
[18]周志恒,赵建军,杨利斌,等.舰艇作战系统海上动态对准技术研究[J].工业仪表与自动化装置,2016(3):125-128.
[19]陈钊,黄凤辰,花再军.一种基于北斗卫星通信的远程水情测报系统RTU设计[J].工业仪表与自动化装置,2016(6):84-86.
[20]洪杰,林密,陈明,等.基于北斗导航的电网移动应急系统设计[J].自动化与仪器仪表,2017(12):63-65.
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