基于FPGA的快速捕星方法实现  

Implementation of quick acquisition method based on FPGA

作　　者：杨鑫[1] 章红平[1] 张提升[1] 

机构地区：[1]武汉大学卫星导航定位技术研究中心,湖北武汉430079

出　　处：《武汉大学学报（工学版）》2015年第3期424-428,共5页Engineering Journal of Wuhan University

摘　　要：为了解决高动态GPS接收机硬件实现快速捕星的问题,提出了一种基于FPGA的利用多通道码相位进行并行捕获的快速捕星方法.该方法分析了码相位并行捕获算法原理及其实现存在的问题;讨论了接收通道数对捕星时间的影响,提出了扩展GPS接收机的通道数保证所有卫星同步搜索的相关器方法;在FPGA开发平台上,实现了并行32通道共享一路基于码相位并行捕获FFT/IFFT模块的快速捕星方法.测试结果表明:基于FPGA的快速捕星方法可行;冷启动条件下,捕星时间小于0.5s,与传统串行捕获方式相比速度有显著提高;应用于高动态GPS接收机实现了实时定位.To solve the quick acquisition problem of the highly dynamic global positioning system（GPS） receiver, the quick acquisition method based on field programmable gate array （FPGA） is proposed. This method uses multichannel parallel code phase acquisition. The principle of code phase hunting algorithm is analyzed; and the same with its implementation. The influence of signal receiving channels on satellite hunting time is discussed and then the correlating method, in which GPS receiver channels were extended to guarantee simultaneous hunting of all satellites, is proposed. Based on FPGA, the quick acquisition method is realized, in which 32 parallel channels were combined with parallel code phase hunting algorithm. The experimental results indicate that the above quick acquisition method is feasible. The hunting time under cold start is less than 0.5 s. Compared with the traditional serial acquisition mode, the speed has improved significantly; and the real-time positioning could be implemented with highly dynamic GPS receivers based on FPGA.

关 键 词：快速捕星 FPGA 码相位捕获 32通道 

分 类 号：TP399[自动化与计算机技术—计算机应用技术]