Instruments and Systems: Monitoring, Control, and Diagnostics Annotation << Back Simulation of Pseudoranges and GNSS Navigation Defi nitions Errors Caused by the Effect of Multipath Propagation of Radio Signals S.N. VERENIKIN The paper considers the modeling pseudo-range errors and navigation definitions of global navigation satellite systems (GNSS), caused by the effect of GNSS radio signal reflection from the planes of urban environment elements. Errors modeling is implemented algorithmically based on a geometric approach as part of the GNSS simulation system. The results of the computational experiment showed the presence of several modes in the probabilistic distribution of errors in pseudo-ranges and navigation determinations over a certain time interval. Keywords: GNSS, navigation errors, radio signal refl ections, pseudo-range errors, multimodal distribution. DOI: 10.25791/pribor.4.2023.1402 Pp. 23-32.