| GPS接收机P(Y)直捕方法研究 |
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| 引用本文： | 张新波,张扬,刘田.GPS接收机P(Y)直捕方法研究[J].电子科技大学学报(社会科学版),2008(Z1). |
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| 作者姓名： | 张新波 张扬 刘田 |
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| 作者单位： | 电子科技大学电子科学技术研究院;电子科技大学电子工程学院;成都610054电子科技大学电子工程学院成都; |
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| 摘 要： | GPS接收机P(Y)直捕算法是基于存储的滑动相关搜索,并利用FFT将时频二维联合搜索变成时域一维搜索。同时,考虑位同步点已知的条件,接收资源池只需存储一段接收序列,缩短了捕获时间且利于硬件实现。仿真结果表明,多普勒频移为±5kHz时,所带来的峰值衰减为2dB左右,本地信号与接收信号对齐时出现明显的相关峰,很好地实现了捕获功能;提出了用重叠分段补零FFT操作实现并行相关,成倍降低了捕获时间;提出了利用位同步信息,避免了码极性翻转可能引起的信噪比损耗;针对码相位漂移,提出了优化捕获策略,可在短时间内完成重捕。
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| 关 键 词： | 傅里叶快速变换 全球定位系统 位同步点 并行相关 长(精)码 |
Research on GPS Long-Code-Acquisition Method |
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| ZHANG Xin-bo,ZHANG Yang, LIU Tian.Research on GPS Long-Code-Acquisition Method[J].Journal of University of Electronic Science and Technology of China(Social Sciences Edition),2008(Z1). |
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| Authors: | ZHANG Xin-bo ZHANG Yang LIU Tian |
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| Institution: | ZHANG Xin-bo1,2,ZHANG Yang2,, LIU Tian1 (1.Research Institute of Electronic Science , Technology,University of Electronic Science , Technology of China Chengdu 610054,2.School of Electrical Engineering,University of Electronic Science , Technology of China Chengdu 610054) |
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| Abstract: | In this paper we describe the use of the storage and code-slide-correlated method on the P(Y) code acquisition in a global positioning system (GPS) receiver. A novel technique of FFT is used to change two-dimension search to one-dimension search. The in-phase point is considered already known, the resource pool is therefore needed only to store one section of the receive data. In this way, the acquisition time can be reduced and the hardware realization becomes easier. As a result, a method called overlap-s... |
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| Keywords: | fast Fourier transform GPS in-phase point parallel correlation P(Y) code |
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