利用信噪比削弱GPS多路径效应的研究

A research on using SNR values to mitigate carrier phase multipath in GPS surveying

由于多路径误差的非时空相关性,使其成为双差模型中较难解除的误差源。本文利用观测值的信噪比对观测值质量进行评价,通过降低受多路径效应影响的观测值的权重,从而达到削减多路径误差的目的。最后通过实验数据解算结果的重复性验证了此方法的有效性和可靠性。

Because multipath is not spatially correlated, it cannot be canceled with differencing techniques. The bias like multipath remains the dominant error source for differential measurements. According to the fact that the quality of each carrier phase measurement is contained in the signal to noise ration (SNR), a weighting scheme using SNR values with GPS carrier phase observable in the presence of multipath is developed in this paper. This technique for multipath mitigation is verified feasible and reliable by the repeated solutions of experimental data.