Early-Late Discriminator Performance of CDMA: Limitations of the Spectral Separation Coefficient
Christoph Enneking, Felix Antreich, André L. F. de Almeida · elib (German Aerospace Center) · 2018
Performance of global navigation satellite system (GNSS) receivers in the presence of intra-and intersystem interference needs to be carefully modeled and monitored for future navigation signal design or for performance assessment of safety-critical applications.Conventional performance models are based on the well-known spectral separation coefficient or related parameters, and rely on the false assumption that GNSS signals are wide-sense stationary, circularly-symmetric Gaussian random processes.We propose a new accurate non-Gaussian performance model for early-late discriminator performance, taking into account the signals' wide-sense cyclostationary property and their non-circularity.The model does not rely on the assumption of many power-balanced interfering satellites, and reliably predicts the shape of the code-phase error distribution, including its tails.We verify the proposed model with numerical simulations, considering all civil GPS/Galileo signals transmitted in the L1/E1 band.