航空学报 > 2010, Vol. 31 Issue (11): 2275-2281

弹道辅助的弹载接收机伪卫星信号快速捕获方案

刘娣, 薄煜明, 陈帅   

  1. 南京理工大学 自动化学院
  • 收稿日期:2009-12-15 修回日期:2010-06-22 出版日期:2010-11-25 发布日期:2010-11-25
  • 通讯作者: 薄煜明

Fast Acquisition Scheme for Pseudolite Signals Assisted by Trajectory in Missile-born Receiver

Liu Di, Bo Yuming, Chen Shuai   

  1. School of Automation, Nanjing University of Science and Technology
  • Received:2009-12-15 Revised:2010-06-22 Online:2010-11-25 Published:2010-11-25
  • Contact: Bo Yuming

摘要: 为实现导航式弹道修正弹在高动态环境下对导航信号的快速捕获且摆脱全球定位系统(GPS)的限制,提出了一个完整的基于伪卫星区域定位系统的弹载接收机信号快速捕获方案。首先利用期望弹道辅助获得多普勒频移初始值以缩小多普勒频移搜索范围,然后采用改进的搜索策略进一步减小多普勒频移搜索时间,最后利用三次样条插值法处理相关谱谱峰及邻近采样点的数据以提高低频采样下粗捕获(C/A)码相位的测量精度。算法分析及仿真结果表明,所提方案能有效缩短多普勒频移搜索时间,提高PN码相位测量精度。

关键词: 弹道辅助, 伪卫星, 捕获, 三次样条, 高动态, 多普勒

Abstract: In order to realize fast acquisition for navigation signals of navigational trajectory correction projectiles in high dynamic environment and to get rid of global position system(GPS) restriction, a complete fast acquisition scheme of missile-born receiver assisted by trajectory is proposed based on pseudolite regional positioning system. First, expectation trajectory is used to get initial value of Doppler shift in the beginning of acquisition. Thus, Doppler shift searching range is reduced. Meanwhile, the improved Doppler shift searching strategy is used to reduce searching time. Furthermore, cubic-spline interpolation method is proposed to process correlation peak and neighboring value to improve the measurement precision of coarse/acquisition(C/A) code phase at low sampling rate. Algorithm analysis and simulation results show that the scheme can effectively shorten Doppler searching time and improve the measurement accuracy of PN code phase.

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