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GPS微弱信号捕获跟踪算法

Keywords: 信息工程,GPS微弱信号,相干积分与非相干积分,FFT快速伪码捕获,载波跟踪

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Abstract:

在GPS微弱信号捕获算法设计中,为提高捕获灵敏度,采用相干积分与非相干积分结合的方式消除数据码长度对相干积分增益的影响,采用差分相干积分减小非相干积分中的平方衰耗。为了提高信号捕获速度和精度,利用FFT工具进行伪码与载波频率捕获,采用延迟锁定环(DLL)与锁相环(PLL)实现GPS微弱信号的跟踪。最后对GPS微弱信号的捕获跟踪算法进行仿真实现。应用结果表明通过仿真技术能有效地复现出捕获和跟踪载噪比为25dB?Hz-1的GPS微弱信号,差分相干积分捕获灵敏度比相干-非相干积分高0.8dB,频率捕获误差小于1.25Hz,码捕获误差小于0.1码元。

References

[1]  KORNIYENKO O V, SHARAWI M S. GPS software receiver implementations[J]. IEEE on Potentials, 2007, 26(3): 42-46.
[2]  LEDVINA B M, PSIAKI M L, POWELL S P, et al. Bit-wise parallel algorithms for efficient software correlation applied to a GPS software receive[J]. IEEE Transactions Wireless Communication, 2004, 3(5): 1469-1473.
[3]  DESHPANDE S M. Study of interference effects on GPS signal acquisition[D]. Calgary: University of Calgary, 2004.
[4]  CAI Bai-gen, SHANGGUAN Wei, WANG Jian, et al. Design and realization of software receiver based on GPS positioning algorithm[C]∥IEEE. Proceeding of the 2009 First IEEEInternational Conference on Information Science and Engineering. Washington DC: IEEE Computer Society, 2009: 2030-2033.
[5]  BORIO D, O’DRISCOLL C, LACHAPELLE G. Coherent, noncoherent and differentially coherent combining techniques for acquisition of new composite GNSS signals[J]. IEEE Transactions on Aerospace and Electronic Systems, 2009, 45(3): 1227-1240.
[6]  ZARRBIZADEH M H, SOUSA E S. A differentially coherent PN code acquisition receiver for CDMA systems[J]. IEEE Transactions on Communications, 1997, 45(11): 1456-1465.
[7]  刘荟萃,许晓勇,王飞雪.扩频测距系统中多径信号伪码跟踪误差分析及消除技术[J].全球定位系统,2005,30(6):34-38. LIU Hui-cui, XU Xiao-yong, WANG Fei-xue. Analysis and mitigation of the code tracking error caused by multipath in spread-spectrum ranging systems[J]. GNSS World of China, 2005, 30(6): 34-38.(in Chinese)
[8]  SáNCHEZ-FERNáNDEZ M.AGUILERA-FORERO M,GARCIA-ARMADA A. Performance analysis and parameter optimization of DLL and MEDLL in fading multipath environments for next generation navigation receivers[J]. IEEE Transactions on Consumer Electronics, 2007, 53(4): 1302-1308.
[9]  GUNAWARDENA S, VAN GRAAS F. Split-sum correlator simplifies range computations in GPS receiver[J]. Electronics Letters, 2006, 42(25): 1469-1471.
[10]  周广宇.微弱GPS信号的捕获与跟踪处理的研究与实现[D].上海:上海交通大学,2009. ZHOU Guang-yu. Research and realization of acquisition and tracking for weak GPS signals[D]. Shanghai: Shanghai Jiaotong University, 2009.(in Chinese)

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