| 基于FPGA的高动态GPS信号FFT快捕设计与实现 |
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| 引用本文： | 杨小江,毛峡,王鹏飞.基于FPGA的高动态GPS信号FFT快捕设计与实现[J].电子测量技术,2007,30(6):170-172. |
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| 作者姓名： | 杨小江 毛峡 王鹏飞 |
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| 作者单位： | 1. 航天科技集团公司五院503所,北京,100086
2. 北京航空航天大学电子信息工程学院,北京,10083 |
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| 摘 要： | 在高动态GPS接收机中,扩频信号捕获是系统的关键技术.系统的高动态特性即导航卫星和接收机之间径向距离和径向速度的影响,使GPS信号产生相位延迟和多普勒频移,加大了信号捕获的难度.若采用通常的滑动相关法捕获,需要很长的捕获时间.为提高捕获性能,本文分析了一种频域FFT快速捕获方法,详细介绍了基于FPGA的具体实现,通过高动态GPS信号发生器的辅助实验,缩短了捕获时间,验证了该算法的有效性,并给出了改进措施.
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| 关 键 词： | 多普勒频移 信号捕获 |
Design and implementation for acquiring of high dynamic GPS signal based on FPGA |
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| Yang Xiaojiang,Mao Xia,Wang Pengfei.Design and implementation for acquiring of high dynamic GPS signal based on FPGA[J].Electronic Measurement Technology,2007,30(6):170-172. |
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| Authors: | Yang Xiaojiang Mao Xia Wang Pengfei |
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| Affiliation: | 1. The 503rd Institute of The Fifth Academy of CASC, Beijing 100086; 2. Electronic Engineering School, Beihang University, Beijing 100083 |
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| Abstract: | As for the high dynamic GPS receiver,acquiring the PN signal is the key technology.The high dynamic of system,namely the radial distance and rate between the navigation satellite and receiver,makes phase delay and Doppler frequency,which makes acquiring more difficult.And it needs long time to acquire GPS signal by general methods.In order to shorten time and improve acquiring performance,a FFT based acquiring method is analyzed,the design and implementation based on FPGA is proposed.By using the high dynamic GPS signal generator to make experiments,the availability of the method is proved.Additionally,the improving measures are presented. |
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| Keywords: | GPS FFT |
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