| 基于频域FFT的P码直接捕获技术研究 |
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| 引用本文： | 周桃云,蔡成林,张怡,廉保旺.基于频域FFT的P码直接捕获技术研究[J].弹箭与制导学报,2010,30(2). |
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| 作者姓名： | 周桃云 蔡成林 张怡 廉保旺 |
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| 作者单位： | 1. 湖南人文科技学院,湖南娄底,417000
2. 西北工业大学电子信息学院,西安,710072 |
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| 基金项目： | 湖南省重点学科建设，湖南省自然科学基金，校级青年课题 |
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| 摘 要： | 为了提高定位精度和满足C/A码不可用的场合,文中提出了GPS(global positioning system)中基于频域FFT的P码直接快速捕获方法,并对不同信噪比情况下的峰值检测结果进行了Matlab仿真分析,接受信号较弱时,则采用视频累积方法.仿真结果表明,基于频域FFT的P码直接快速捕获方法可行.通过理论分析,与传统的滑动相关法相比,这种快速捕获方法的捕获时间缩短了十倍以上,捕获运算量也大大减少.
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| 关 键 词： | P码直接捕获 伪随机码 |
Research of Direct P-code Acquisition Based on FFT |
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| Abstract: | In order to increase positioning accuracy and meet the application where C/A code is unavailable,the direct P-code acquisition is useful.A fast P-code acquisition in GPS based on FFT was proposed and its performance was analyzed.The simulation and analysis results show,compared with conventional slipping correlation method,the capturing time of this fast P-code acquisition method is reduced more times,and the calculation is also reduced greatly.It has reference value for the other direct long pseudo random noise (PRN) code acquisition. |
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| Keywords: | GPS FFT global positioning system (GPS) direct P-code acquisition FFT pseudo random noise (PRN) code |
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