| 卫星导航中一种新的能量压缩算法 |
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| 引用本文： | 纪元法.卫星导航中一种新的能量压缩算法[J].武汉理工大学学报(交通科学与工程版),2009,33(5):952-955. |
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| 作者姓名： | 纪元法 |
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| 作者单位： | 桂林电子科技大学应用科技学院,桂林541004;中国科学院国家天文台,北京100012 |
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| 基金项目： | 国家“973”计划项目(批准号:2007CB815500);;国家自然科学基金项目(批准号:60802018);;国家天文台青年基金项目资助 |
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| 摘 要： | 针对卫星导航系统,特别是采用直接序列扩频的卫星导航系统,利用其循环平稳特性,采用陷波滤波器滤除伪随机码频谱中一些频率,然后再用载波调制信号.信号处理后卫星导航信号的能量大大降低,而伪随机码与本地码的相关特性保持不变,即,码测距精度不变.这种处理后的弱卫星导航信号可以寄生在其它卫星,而不被发现,从根本上提高了系统的抗干扰能力.最后并通过仿真验证了方法的可行性.
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| 关 键 词： | 卫星导航 CA码 抗干扰 陷波滤波器 循环平稳 寄生 |
A Novel Energy Suppression Algorithm for Satellite Navigation |
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| Ji Yuanfa.A Novel Energy Suppression Algorithm for Satellite Navigation[J].journal of wuhan university of technology(transportation science&engineering),2009,33(5):952-955. |
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| Authors: | Ji Yuanfa |
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| Institution: | Applied Science and Technology College;Guilin University of Electronic Technology;Guilin 541004;National Astronomical Observatory;Chinese Academy of Sciences;Beijing 100012 |
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| Abstract: | This paper aims at satellite navigation systems,especially at satellite navigation systems adopting direct sequence spread spectrum (DSSS). Notch filter is used to remove some frequencies from pseudorandom code frequency spectrum making use of its cyclostationarity first,then filtered pseudorandom code is modulated by carrier to attain energy suppressing,but the pseudorandom code autocorrelation characteristic keeps unchanged. As a result,this satellite navigation signal is weak enough to be parasitized on ... |
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| Keywords: | satellite navigation CA code anti-interference notch filter cyclostationarity parasitizing |
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