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北斗一号卫星信号高灵敏度捕获方法

Keywords: 卫星导航,高灵敏度捕获,北斗一号卫星

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Abstract:

研究在复杂环境下弱北斗一号卫星信号的捕获方法.利用北斗一号卫星在同一频率上发射两个波束和帧头与卷尾组成已知连续信息序列的特点,可以对两个波束做长时间相干联合捕获.从增加捕获信号功率和减小非相干累加损失两个方面提高捕获灵敏度.仿真和实测结果表明,联合捕获方法可以捕获低于-133dBm的信号,性能优于单波束串行搜索捕获方法.

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