Automatic acquisition method of BeiDou Satellite Navigation weak signal based on density clustering
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摘要: 在外界射频信号、导航接收机混频处理噪声的影响下，为了有效捕获北斗卫星导航弱信号信息，提出基于密度聚类的北斗导航弱信号自动捕获方法. 使用密度聚类得到BDS信号来源的聚类中心，结合聚类中心设计卫星波束方向，约束卫星导航信号接收范围，抵御干扰信号的空域干扰；通过基于小波阈值方法去除波束抗干扰作用下导航信号的噪声信息；采用相关函数模值计算方法计算去噪后导航信号和已知弱信号之间相关性，相关性大于门限值时说明去噪后导航信号为弱信号. 实验结果表明，在外界射频信号和混频器干扰下，此方法具备自动捕获北斗卫星导航弱信号的能力.Abstract: In order to effectively capture BeiDou Satellite Navigation (BDS) weak signal information under the influence of external RF signals and mixed frequency processing noise of navigation receiver, the automatic acquisition method of BDS weak signal based on density clustering is studied. The density clustering is used to design the satellite beam direction from the cluster center of BDS signal source in combination with the cluster center, and constrain the receiving range of satellite navigation signals, and resist the airspace interference of jamming signals. The noise information of navigation signal under the effect of beam anti-jamming is removed by wavelet threshold method. The correlation between the de-noised navigation signal and the known weak signal is calculated using the correlation function modulus calculation method. If the correlation is greater than the threshold value, the de-noised navigation signal is a weak signal. The experiment verifies that under the interference of external RF signals and mixers, this method has the ability to automatically capture the weak signals of BDS.
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Key words:
- density clustering /
- BeiDou Satellite /
- navigation /
- weak signal /
- automatic capture /
- beam anti-jamming
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