Our objective in this paper is to assess all errors in NavIC's pseudorange so that they can be mitigated or accounted for appropriately in the dynamics model to achieve high‐accuracy navigation. Multipath errors in the L5 and S1 pseudoranges are different; hence, oscillatory multipath is removed using sidereal repeatability for these frequencies separately for accurate iono delay estimation. Iono delay estimates using uncompensated pseudoranges are 7‐m greater than the normal night time estimates due to multipath. When oscillations are removed, the difference reduces to 3 m. Dual‐frequency estimates using code phase are within two‐sigma of the grid‐based estimates. A comparison of the NTCM‐GL and Klobuchar iono delay estimates is presented for the low‐latitude region in India. The ephemeris line‐of‐sight errors blended with the unknown multipath bias errors are estimated using a low‐pass filter and are found to lie at the edges of the two‐sigma signal‐in‐space error.

中文翻译：

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固定接收机的NavIC可观测值的误差评估

本文的目的是评估NavIC伪距中的所有错误，以便可以在动力学模型中适当地减轻或解决这些错误，以实现高精度导航。L5和S1伪距中的多径错误是不同的。因此，分别使用这些频率的恒星重复性来消除振荡多径，以实现精确的电离延迟估计。由于存在多径，使用无补偿伪距的电离延迟估算值比正常夜间估算值大7-m。消除振荡后，差异减小为3米 使用代码相位的双频估计在基于网格的估计的两个西格玛之内。对印度低纬度地区的NTCM‐GL和Klobuchar iono延迟估计值进行了比较。使用低通滤波器估计星历线视线误差与未知的多径偏置误差，发现该误差位于二西格玛信号空间误差的边缘。