一种基于伪卫星信号正交性的远近效应消除技术

李涛护; 刘建胜; 黄智刚; 秦红磊

doi:10.3724/SP.J.1146.2009.00784

一种基于伪卫星信号正交性的远近效应消除技术

doi: 10.3724/SP.J.1146.2009.00784

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出版历程
- 收稿日期: 2009-05-22
- 修回日期: 2009-12-11
- 刊出日期: 2010-06-19

A Solution of the Near-Far Effect Based on the Orthogonality of Pseudolite Signal

摘要

摘要: 该文针对导航领域伪卫星应用中的远近效应问题，提出了一种根据伪卫星信号正交性消除远近效应的新思想。在对伪卫星信号之间的正交性进行理论分析的基础上，提出了正交投影算法，该算法从接收信号中提取并减去在强信号分量上的投影，以减轻强信号对弱信号的捕获干扰，且具有无需改动接收机的硬件结构和估计信号分量幅度等优点。通过仿真与传统的滑动相关方法进行了捕获性能比较，结果表明，在捕获概率为90%的条件下，正交投影算法能将抗远近效应的能力提高约9 dB。
- 卫星导航; 伪卫星; 远近效应; 正交投影算法
Abstract: The main difficulty in the use of pseudolites is the near-far effect, where the strong signal component prevents a conventional receiver from detecting the weak component. A new solution based on the orthogonality of the pseudolite signal is presented, which constructs the orthogonal projection of the strong component and then cancels out this projection from the received signal to reduce the interference of the strong component on acquiring the weaker. This solution needs neither to modify the receivers hardware nor to estimate the amplitude of the signal component. Simulation results shows that, at the same acquisition probability of 90%, the performance of near-far resistance of this new method compared with conventional sliding detector is improved about 9 dB.

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