一种加速GNSS信号捕获的短时傅里叶变换算法
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摘要
提高GNSS信号捕获速度从而减少定位时间,是目前GNSS信号处理研究热点之一。短时傅里叶变换是一种通过设立窗口函数与采样信号相乘从而提高捕获速度的方法。为了提高GNSS信号捕获速度,利用短时傅里叶算法对GNSS信号捕获的算法进行了改进。实验中选取了不同的窗口函数对GNSS信号峰值以及处理速度的变化进行了分析。在其码相位和频率基本不变的情况下,得到了在峰值变化较小时,短时傅里叶变换能有效提高其捕获速度的结论。
At present, improving the acquisition speed of GNSS signal to reduce the positioning time is one of the research hotspots of GNSS signal processing. Short-time Fourier transform(STFT) is a method to improve the acquisition speed by multiplying the sampling signal with a window function. In order to improve the acquisition speed of GNSS signal, the short-time Fourier algorithm is used to improve the acquisition algorithm of GNSS signal. In this paper, different window functions are selected to analyze the change of peak value and processing speed of GNSS signal. The conclusion that short-time Fourier transform can improve the acquisition speed of GNSS signal effectively under the condition that the code phase and frequency are basically unchanged is obtained.
At present, improving the acquisition speed of GNSS signal to reduce the positioning time is one of the research hotspots of GNSS signal processing. Short-time Fourier transform(STFT) is a method to improve the acquisition speed by multiplying the sampling signal with a window function. In order to improve the acquisition speed of GNSS signal, the short-time Fourier algorithm is used to improve the acquisition algorithm of GNSS signal. In this paper, different window functions are selected to analyze the change of peak value and processing speed of GNSS signal. The conclusion that short-time Fourier transform can improve the acquisition speed of GNSS signal effectively under the condition that the code phase and frequency are basically unchanged is obtained.
引文
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[2] 董俊杰.基于Matlab的北斗二代B1频点软件接收机研究与实现[D].西安:长安大学,2014:4-5.DONG J J.Research and implementation of beidou second generation B1 frequency point software receiver based on matlab[D].Xi’an:Chang’an University,2014:4-5.
[3] 杨春宁,李子月,陈善秋,等.捷联惯性/卫星超紧组合导航技术综述与展望[J].系统工程与电子技术,2016,38(4):866-869.YANG C N,LI Z Y,CHEN S Q,et al.Overview and prospect of strapdown inertial/satellite ultra-tight integrated navigation technology[J].Systems Engineering and Electronic Technology,2016,38(4):866-869.
[4] 袁俊刚.GPS/惯性紧组合导航系统研究[D].南京:南京航空航天大学,2011:34-40.YUAN J G.Research on GPS/INS integrated navigation system[D].Nanjing:Nanjing University of Aeronautics and Astronautics,2011:34-40.
[5] 杨久东,吴风华,王文军.基于平均分组和叠加相关的GPS信号捕获方法[J].大地测量与地球动力学,2018,38(8):828-845.YANG J D,WU F H,WANG W J.GPS signal acquisition method based on average grouping and superposition correlation[J].Geodesy and Geodynamics,2018,38(8):828-845.
[6] 李作虎,史俊文,刘雪瑞,等.GPS软件接收机跟踪通道信号统计分析[J].测绘科学技术学报,2010,27(2):97-100.LI Z H,SHI J W,LIU X R,et al.Statistical analysis of GPS software receiver tracking channel signals[J].Journal of Geomatics Science and Technology,2010,27(2):97-100.
[7] 王献中,杨静.一种快速的GPS软件接收机信号捕获方案设计[J].系统仿真学报,2010,22(1):25-29.WANG X Z,YANG J.Design of a fast GPS software receiver signal acquisition scheme[J].Journal of System Simulation,2010,22(1):25-29.
[8] 谢钢.GPS原理与接收机设计[M].北京:电子工业出版社,2009:372-374.XIE G.GPS principle and receiver design[M].Beijing:Electronic Industry Press,2009:372-374.
[9] SEO H,CHOI I,GWAK J,et al.Extended multiple correlator for GPS receivers[C]//ION GPS.Nashville,TN,2002:1612-1618.
[10] SEO H,PARK C,LEE S.A new fast acquisition algorithm for GPS receivers[C]//Proceedings of the 2000 International Symposium on GPS/GNSS.Seoul,Korea,2000:1542-1548.
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