Tracking Error Modeling in Presence of Satellite Imperfections

Modeling of both nominal distortions and signal anomalies (i.e., evil waveforms) is crucial for an accurate user error budget for satellite based augmentation systems (SBAS) and multi‐frequency multi‐constellation ground based augmentation systems (GBAS). Such analysis is of particular interest for the ongoing standardization work of L1‐L5 SBAS services. In this paper we propose a method to jointly estimate analog and digital distortion of a satellite navigation signal based on high gain antenna measurements. Joint estimation of analog and digital distortion is needed in case the estimates of these two satellite signal imperfections are interdependent. This is the case when the time‐bandwidth product of the satellite signal is small. The impact of both satellite imperfections on the ranging performance of a GNSS receiver is assessed by means of analytical formulations which make use of the cross‐power spectral density (CPS) between the distorted and the ideal signal and of the power spectral density (PSD) of the nominal (ideal) signal. Copyright © 2016 Institute of Navigation