The influence of the standard deviation of the motion characteristic equation and the measurement frequency on the measurement accuracy of the track irregularity is studied in depth.The model is established by combining the GNSS/INS and NHC algorithms,and the covariance method is used for quantitative analysis.Through simulation experiments,it is verified that the addition of motion characteristic equation improves the measurement accuracy of track irregularity.When the standard deviation of the motion characteristic equation is constant,the accuracy increases with the increase of frequency.When the frequency is constant,the smaller the standard deviation of the motion characteristic equation,the higher the orbit measurement accuracy.Given the appropriate standard deviation of the motion characteristic equation can meet the requirements of track irregularity measurement accuracy.The field experimental results are basically consistent with the simulation results,which proves the correctness of the proposed method.The research conclusions provide a reference for improving the measurement accuracy of track irregularity.
维普
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