GPS码精密跟踪环路的研究

基金项目: 国家973计划资助项目(2009CB724002,2009CB724001)；国家863计划资助项目(2007AA12Z340,2007AA12Z302,2008AA121302)

详细信息

Precise Tracking Loop of GPS Code

¹School of Instrumentation Science and Opto-electronics Engineering,Beihang University,37 Xueyuan Road,Haidian District,Beijing 100191,China;²School of Electronic and Information Engineering,Beihang University,37 Xueyuan Road,Haidian District,Beijing 100191,China

Funds: 国家973计划资助项目(2009CB724002,2009CB724001)；国家863计划资助项目(2007AA12Z340,2007AA12Z302,2008AA121302)

摘要: 为了实现卫星移动环境下GPS信号码相位的精密跟踪,推导出了常见鉴相器增益的形式,得出鉴相器增益越大、环路的牵引速度越大、稳态跟踪精度越差的推论;讨论了相关间距、环路带宽和相关器增益对码环路跟踪的影响,分析说明相关间距的减小较动态减小来说对跟踪更为有利。用Matlab仿真平台验证了推论和分析的正确性,并提出了一种基于窄相关和点积功率型码鉴相器的更为合理的环路设计方案。
- 全球定位系统 /
- C/A码 /
- 鉴别器 /
- 跟踪
Abstract: In order to realize the precise tracking of GPS code in the environment of satellite motion,discriminators gain conception is given and the gain forms of the usual discriminator are derived.Then the deduction is given that the larger the discriminator gain is,the higher the pull in speed is and the lower the steady tracking precision is.The effect of correlator space,loop bandwidth and the correlator gain on precise tracking are discussed.The analysis is given that correlator space decrease deduces the tracking error more than dynamic decrease.The correctness of the deduction and the analysis are validated by the Matlab simulation platform.At last,a more reasonable loop design scheme is proposed based on narrow correlator and dot production discriminator.
- GPS /
- C/A /
- discriminator /
- tracking