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基于非相干累积的微弱GPS信号相位估计

Keywords: 全球定位系统,微弱信号,非相干累积,相位估计

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Abstract:

针对全球定位系统(GPS)微弱信号相位估计不能满足实际应用的问题,利用二倍相位处理和直接判决反馈这两种方法消除导航数据跳变的影响,提出了基于非相干累积的最大似然(ML)相位估计器.通过理论分析,推导出信噪比表达式,利用条件概率密度函数(CPDF)的数值积分计算出估计器的均方根误差(RMSE),证明非相干累积有效降低了ML相位估计器的RMSE,提高了GPS微弱信号相位估计能力.仿真结果验证了理论分析和所提算法的有效性,基于FPGA的实现结果表明算法的可应用性.

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