中国空间科学技术

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双星定位系统入站信号在低信噪比条件下的快速捕获

叶飞,陆文福   

  1. 北京卫星信息工程研究所 ,北京卫星信息工程研究所
  • 发布日期:1991-06-25

FAST ACQUISITION OF INBOUND SIGNAL UNDER LOW SIGNAL—TO—NOISE RATIO CONDITION IN RDSS SYSTEM

Ye Fei Lu Wenfu (Beijing Institute of Information Engineering)   

  • Online:1991-06-25

摘要: 从整个系统的角度出发,对各种可行的快捕方式进行了分析,建立了简明准确的数学模型。运用这些数学模型就伪随机码、高斯限带噪声和多卜勒频移对快捕性能的影响进行了计算机模拟分析,得出了一些定量和定性的结论。并指出SAW 匹配滤波器是一种最佳的选择。此外,还对RDSS 标准入站信号的伪码同步图案进行了理论分析,并构想了一种可能的捕获方式。

关键词: RDSS系统, PN码捕获, 数学模型, 匹配滤波器, 分析

Abstract: The paper presents an overall analysis on various kinds ofpossible methods of fast acquisition in the view of the whole system. Precisemathematical models have been established and used to analyse the influencesof PN pattern,Gaussian noise and Doppler frequency shift on the perfor-mance of PN code aquisition.Computer-aided analysis gives some quantitativeand qualitative results which indicate that SAW matched filter is the bestchoice.Theoretical analysis is also given to the recommended RDSS standardinbound PN pattern.One possible fast acquisition method has been conceivedaccording to this pattren.