摘要
为了解决高动态下的GPS信号捕获问题,本文给出了基于FFT循环相关的信号快速捕获算法设计、FPGA实现及实测结果。文中分析了多普勒对C/A码周期的影响、高动态条件下的相干和非相干累加时长与多普勒搜索范围的关系;讨论了FFT数据长度的选择策略,给出了具体的FPGA设计实现;最后利用真实卫星信号和GPS信号模拟器信号进行了测试,结果表明本文实现的FFT快捕算法在20g加速度动态下能够正确捕获信号。
To resolve the signal acquisition problem in high dynamic scenarios,this paper gives the algorithm design,FPGA implementation and test results of a fast signal acquisition approach based on FFT circular-correlation.The impact of doppler on the local C/A code period,as well as the relationship between the coherent/non-coherent accumulation time and the search range of Doppler in high dynamic scenarios are analyzed.The number of samples of FFT computation and the FPGA implementation of the algorithm are disscussed.Finally the design is tested using both the live GPS satellite signals and simulator-generated signals.The results show that the algorithm implemented in this paper works well with 20g acceleration.
出处
《微计算机信息》
2010年第28期121-123,共3页
Control & Automation
基金
基金申请人:寇艳红
项目名称:高动态
抗干扰卫星导航接收机关键技术研究
基金发部门:中华人民共和国科技部(2006AA12Z304)
