摘要
对新一代精密卫星导航定位系统RNSS(Radio Navigation Satellite System)中频信号的捕获原理进行了分析,重点研究了一种基于FFT的并行码相和串行载频搜索的捕获策略,在基于捕获原理的基础上比较了该策略和串行码相串行频域搜索策略在进行捕获时计算量上的差异,并提出了一种动态设定捕获阈值的方法。最后,利用一组实测GPS信号进行仿真试验,验证了该快速捕获算法的正确性和有效性。
The principle of acquisition for RNSS IF signals is analyzed in this paper, which focuses on strategy of using a method that adopts sequential acquisition in Doppler frequency domain and parallel acquisition in code phase using FFT instead of serial search acquisition with more computations. And a strategy of how to define acquisition threshold dynamically is proposed. Moreover, the software implementation of the proposed method is analyzed and the validity of this acquisition is tested and verified using the raw GPS signal acquired.
出处
《武汉理工大学学报》
CAS
CSCD
北大核心
2009年第17期127-130,共4页
Journal of Wuhan University of Technology
基金
国家自然科学基金(40706058)
关键词
RNSS
伪随机码
FFT
捕获
RNSS
pseudo random code
fast Fourier transform （FFT）
acquisition
