| 一种基于FFT的高动态GPS信号快速捕获方法 |
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| 引用本文： | 刘晓莉,李云荣. 一种基于FFT的高动态GPS信号快速捕获方法[J]. 系统仿真学报, 2007, 19(10): 2151-2155 |
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| 作者姓名： | 刘晓莉 李云荣 |
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| 作者单位： | 1. 武汉大学卫星导航定位技术研究中心,湖北,武汉,430079;武汉大学电气工程学院,湖北,武汉,430072;武汉大学电子信息学院,湖北,武汉,430079
2. 武汉大学电气工程学院,湖北,武汉,430072 |
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| 基金项目： | 国家重点实验室基金;国家测绘科技发展基金 |
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| 摘 要： | 对高动态GPS信号快速捕获问题进行了研究,提出了一种适应高动态环境,捕获时间短的捕获方法。该方法采用多普勒频域串行捕获,时域由FFT代替滑动相关的并行捕获的二维策略,从而大大提高了高动态GPS接收机的信号捕获性能。分析了基于FFT的快速捕获原理和软件实现,并通过对实测的GPS信号的捕获验证了该捕获方法的正确性。
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| 关 键 词： | 全球定位系统(GPS) 伪随机码 快速傅里叶变换 捕获 |
| 文章编号： | 1004-731X（2007）10-2151-05 |
| 收稿时间： | 2006-09-14 |
| 修稿时间： | 2006-09-142006-12-26 |
Fast Acquisition Based on FFT for High Dynamic GPS Signals |
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| LIU Xiao-li,LI Yun-rong. Fast Acquisition Based on FFT for High Dynamic GPS Signals[J]. Journal of System Simulation, 2007, 19(10): 2151-2155 |
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| Authors: | LIU Xiao-li LI Yun-rong |
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| Affiliation: | 1.GNSS Research Center, Wuhan University, Wuhan 430079, China; 2.School of Electrical Engineering, Wuhan University, Wuhan 430072, China; 3. Institute of Electronic Information, Wuhan University, Wuhan 430079, China |
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| Abstract: | The fast acquisition for high dynamic GPS signals was studied, and an acquiring strategy was proposed which decreases acquiring time and works well in high dynamic environment. This method introduces a 2-D acquiring strategy, which adopts sequential acquisition in Doppler frequency domain and parallel acquisition using FFT instead of sliding correlation in time domain. Thus the acquiring performance of GPS receiver is improved. Moreover, both the principle and software implementation of the proposed method are analyzed. The accuracy of this acquisition is tested and verified using the raw GPS signal acquired. |
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| Keywords: | global position system (GPS) pseudo random code fast Fourier transform (FFT) acquisition |
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